| blood parasites of some waterfowl from victoria, australia. | a total of 316 anatids (5 species) from serendip wildlife research station, lara, victoria, were examined for blood parasites. twenty-two of the ducks (all five species) harbored haemoproteus nettionis and one also harbored plasmodium relictum. none of 12 dusky moorhens (gallinula tenebrosa) were infected. there was no significant difference in the prevalence of h. nettionis between species or age groups of ducks. no evidence of infection with leucocytozoon, trypanosoma or microfilaria was obtai ... | 1977 | 405511 |
| avian malaria in african black-footed penguins. | ten captive-reared african black-footed penguins (spheniscus demersus) from a large outdoor colony were monitored for avian malaria, using several diagnostic tests. one treatment regimen was evaluated. thin smear blood evaluation enabled detection of seven parasitemias involving plasmodium relictum and plasmodium elongatum in the penguins. leukocytosis (relative lymphocytosis) was characteristic of infected birds. parasitemia was detected as early as 21 days prior to onset of clinical signs (dep ... | 1979 | 521378 |
| parasite cultivation in relation to research on the chemotherapy of malaria. | attempts to develop techniques for the continuous in vitro cultivation of the malaria parasite have not yet proved successful. it has not been possible to obtain the complete sporogonic development of the parasite in vitro although some progress was made with plasmodium relictum and p. berghei. exoerythrocytic stages of p. gallinaceum have been successfully cultivated in vitro in tissue explants and those of p. fallax have been grown in turkey primary embryo tissue cells. with the recent develop ... | 1976 | 1086733 |
| use of amino acids by plasmodium relictum oocysts in vitro. | | 1976 | 1253879 |
| comparative susceptibility of culex tarsalis, anopheles franciscanus, and culiseta inornata (diptera: culicidae) to plasmodium relictum (haemosporidia: plasmodiiae). | repeated laboratory attempts failed to infect culiseta inornata (williston) and anopheles franciscanus mccracken with plasmodium relictum as efficiently as culex tarsalis coquillett controls. of 210 an. franciscanus that imbibed a replete meal from a parasitemic canary, two were found with oocysts and none with sporozoites. of 112 cs. inornata similarly fed, seven contained oocysts and one contained sporozoites. in contrast, of 94 cx. tarsalis tested, 80 (85%) were found with oocysts, thus confi ... | 1990 | 1967655 |
| plasmodium relictum as a cause of avian malaria in wild-caught magellanic penguins (spheniscus magellanicus). | avian malaria (plasmodium relictum) caused significant mortality in wild-caught magellanic penguins (spheniscus magellanicus) in 1986 at the blank park zoo in des moines, iowa (usa). in early winter, wild birds were captured off the southern coast of chile and flown to detroit, michigan for a 38 day quarantine. after quarantine, 18 birds were dispersed to lansing, michigan, six to a facility in maine, and 46 to des moines, iowa. upon arrival in des moines, several penguins became weak and inacti ... | 1988 | 3193555 |
| effects of plasmodium relictum on the metabolic rate and body temperature in canaries (serinus canarius). | | 1987 | 3625437 |
| the cultivation of plasmodium relictum in mosquito cell lines. | | 1971 | 4396509 |
| spring relapse of plasmodium relictum infections in an experimental field population of english sparrows (passer domesticus). | | 1971 | 5138979 |
| cross immunity between plasmodium relictum and plasmodium lophurae in chickens. | | 1969 | 5349499 |
| cross immunity between plasmodium relictum and plasmodium lophurae in chickens. | | 1969 | 5389917 |
| evaluation of serum chemistry values associated with avian malaria infections in african black-footed penguins (spheniscus demersus). | the value profiles of 5 intracellular enzymes, 15 metabolites (with 2 associated ratios), and 3 electrolytes were monitored over time in 9 captive-reared african black-footed penguins (spheniscus demersus) with different avian malaria clinical status: uninfected, subclinically infected, and clinically infected with fatal outcome. fatal infections were caused by plasmodium relictum. numerous schizonts were visible in the lungs, liver, spleen, and interstitial tissue of the kidneys. the reference ... | 1995 | 7624290 |
| characteristics of naturally acquired avian malaria infections in naive juvenile african black-footed penguins (spheniscus demersus). | antibody responses to naturally acquired plasmodium relictum and p. elongatum infections, blood parasitemia, and disease signs were investigated in 23 naive juvenile african black-footed penguins (spheniscus demersus). anti-plasmodium spp. immunoglobulins were detected by enzyme-linked immunosorbent assay (elisa) using p. falciparum antigens. all birds rapidly developed antibody to p. relictum and p. elongatum. five penguins showed detectable parasitemia and signs of the disease. parasitemia was ... | 1994 | 7886030 |
| extraction of haemoproteus columbae (haemosporina: haemoproteidae) antigen from rock dove pigeons (columba livia) and its use in an antibody elisa. | erythrocytic stages of haemoproteus columbae were extracted from the cytoplasm of nucleated red blood cells (rbc) of rock dove pigeons (columba livia) using cationic detergent (n,n',n'-polyoxyethylene(10)-n-tallow-1,3-diaminopropane [edta-20]) and discontinuous percoll gradient density. crude rbc extract (crbce) antigen was prepared. parasitized rbcs were more resistant to edta-20 action than unparasitized cells. an enzyme-linked immunosorbent assay (elisa) was developed for detection of anti-h. ... | 1994 | 7931906 |
| subclinical avian malaria infections in african black-footed penguins (spheniscus demersus) and induction of parasite recrudescence. | the subclinical and clinical plasmodium elongatum and plasmodium relictum infections of captive-reared african black-footed penguins (spheniscus demersus) were evaluated in nine adult and 29 juvenile penguins in the baltimore zoo (maryland, usa) during summer 1988 and winter 1989. two diagnostic methods were used: giemsa-stained thin blood films, and subinoculation of penguin blood into 1-day-old peking ducklings. chloroquine and primaquine treatment was applied to all parasitemic juvenile pengu ... | 1994 | 7933280 |
| hematologic characteristics of avian malaria cases in african black-footed penguins (spheniscus demersus) during the first outdoor exposure season. | twenty-nine juvenile, captive-reared african black-footed penguins (spheniscus demersus) were hematologically monitored every 2 wk over the period of 24 wk during their first outdoor exposure. blood samples taken from the penguins were screened for 12 blood evaluation parameters. parasitemic penguins were medically treated. eighteen birds (62.1%) experienced naturally acquired malaria and 11 birds (37.9%) remained nonparasitemic. a total of 32 avian malaria episodes were noted; 25 (78.1%) were i ... | 1994 | 8158474 |
| elisa method for detecting anti-plasmodium relictum and anti-plasmodium elongatum antibody in infected duckling sera using plasmodium falciparum antigens. | an enzyme-linked immunosorbent assay (elisa) with 3 plasmodium falciparum nf-54 antigens, r32tet32, p.f.r27, and crude red blood cell extract (crbce), was tested for detection of anti-plasmodium relictum and anti-plasmodium elongatum antibodies in sera from experimentally infected ducklings. whole blood, serum, and dried blood on filter paper gave similar results. the latter was selected for convenience. all birds infected by experimental blood challenge, but not exposed to sporozoites, had dete ... | 1993 | 8277381 |
| an elisa for detecting anti-plasmodium spp. antibodies in african black-footed penguins (spheniscus demersus). | an enzyme-linked immunosorbent assay (elisa) utilizing 3 plasmodium falciparum antigens, r32tet32, p.f.r27, and crude red blood cell extract, was developed for the detection of circulating anti-plasmodium relictum or anti-plasmodium elongatum antibodies in sera from naturally infected adult african black-footed penguins (spheniscus demersus) at the baltimore zoo, maryland. a concentration of 2.0 micrograms/ml of each antigen was optimal in terms of specificity, sensitivity, and test speed. it wa ... | 1994 | 8308660 |
| characteristics of naturally acquired plasmodium relictum capistranoae infections in naive hawaiian crows (corvus hawaiiensis) in hawaii. | indigenous to hawaii, the hawaiian crow (corvus hawaiiensis) is the world's most severely endangered species with only 3 reproductively active pairs remaining in the wild. seven captive-reared, avian malaria-naive c. hawaiiensis were exposed in an outdoor aviary and hematologically and serologically monitored for 9 wk. three birds showed plasmodium relictum capistranoae parasitemia (6.35%, 2.15%, and 0.60%). all birds were seroconverted for malaria on week 7 as determined by enzyme-linked immuno ... | 1996 | 8627494 |
| wildlife disease and conservation in hawaii: pathogenicity of avian malaria (plasmodium relictum) in experimentally infected iiwi (vestiaria coccinea). | | 1995 | 8632925 |
| parasite diversity in an endemic region for avian malaria and identification of a parasite causing penguin mortality. | understanding the population structure of plasmodium parasites is essential for malaria intervention. a survey of parasites in vectors and host infections was conducted in an area of intense mortality due to malaria in a captive penguin (spheniscus demersus) colony, using a novel method for identification of plasmodium species by amplification of ribosomal sequences in dna or rna. three phylogenetically distinct groups of avian plasmodium were detected in mosquitoes (culex) collected at the stud ... | 1996 | 8822810 |
| a model for the prediction of relative titres of avian malaria and aspergillus spp. igg in jackass penguin (spheniscus demersus) females based on maternal igg in egg-yolk. | a model for the prediction of igg titres in females of the jackass penguin (spheniscus demersus) was developed, based on igg which was maternally transmitted to the yolk of unembryonated eggs produced by these females. however, prediction of the female titre based on the titre of embryonated eggs may be inadequate. blood samples from 10 s. demersus females and their corresponding embryonated (n = 10) and unembryonated (n = 49) eggs were analysed by indirect elisa for avian malaria (plasmodium re ... | 1996 | 8894766 |
| hematozoa in two populations of the threatened red-billed chough in spain. | the prevalence of hematozoa in two populations of red-billed choughs (pyrrhocorax pyrrhocorax) was sampled in 1992 and 1994 in spain. two blood parasites infected red-billed choughs. a species of plasmodium, possibly plasmodium relictum, and the piroplasm babesia frugilegica, are described for the first time from this host. low prevalence (1/178, < 1%) of hematozoa in these populations, was evidence for a lack of effects of blood parasites on the life history and conservation of this threatened ... | 1997 | 9249715 |
| pathogenicity of avian malaria in experimentally-infected hawaii amakihi. | the introduction of avian malaria (plasmodium relictum) and mosquitoes (culex quinquefasciatus) to the hawaiian islands (usa) is believed to have played a major role in the decline and extinction of native hawaiian honeycreepers (drepanidinae). this introduced disease is thought to be one of the primary factors limiting recovery of honeycreepers at elevations below 1,200 m where native forest habitats are still relatively intact. one of the few remaining species of honeycreepers with a wide elev ... | 2000 | 10813599 |
| serological responses and immunity to superinfection with avian malaria in experimentally-infected hawaii amakihi. | six of seven hawaii amakihi (hemignathus virens) with chronic malarial infections had no increases in peripheral parasitemia, declines in food consumption, or loss of body weight when rechallenged with the homologous isolate of plasmodium relictum 61 to 62 days after initial infection. five uninfected control amakihi exposed at the same time to infective mosquito bites developed acute infections with high parasitemias. reductions in food consumption and loss of body weight occurred in all contro ... | 2001 | 11272498 |
| a comparison of the blood parasites in three subspecies of the yellow wagtail motacilla flava. | one-hundred and eighty yellow wagtails motacilla flava belonging to 3 subspecies (motacilla flava feldegg, motacilla flava flava, motacilla flava thunbergi) were caught during the spring migration in south kazakhstan and investigated by microscopic examination of stained blood smears. haemoproteus anthi, haemoproteus motacillae, leucocytozoon fringillinarum, leucocytozoon majoris, plasmodium relictum, plasmodium polare, atoxoplasma sp., trypanosoma sp., and microfilariae were identified. the ove ... | 2001 | 11534666 |
| pcr diagnostics underestimate the prevalence of avian malaria (plasmodium relictum) in experimentally-infected passerines. | several polymerase chain reaction (pcr)-based methods have recently been developed for diagnosing malarial infections in both birds and reptiles, but a critical evaluation of their sensitivity in experimentally-infected hosts has not been done. this study compares the sensitivity of several pcr-based methods for diagnosing avian malaria (plasmodium relictum) in captive hawaiian honeycreepers using microscopy and a recently developed immunoblotting technique. sequential blood samples were collect ... | 2002 | 12053956 |
| comparative development of plasmodium relictum oocysts in anopheles quadrimaculatus, a. albimanus, and culex pipiens. | | 1953 | 13035579 |
| [relation of nyctohemeral rhythm of birds to mass cycle of plasmodium relictum]. | | 1953 | 13063055 |
| [studies on blood parasites. iv. behavior of a strain of plasmodium relictum in pigeons]. | | 1953 | 13112728 |
| susceptibility of culex (culex) bitaeniorhynchus giles, 1901, to plasmodium relictum but not to plasmodium gallinaceum and plasmodium falciparum. | | 1955 | 13262831 |
| experimental studies of concurrent infection of canaries and of the mosquito culex tarsalis with plasmodium relictum and western equine encephalitis virus. | | 1956 | 13292656 |
| [tissue stages of plasmodium relictum s strain]. | | 1956 | 13321386 |
| changes in infectivity of plasmodium relictum for avian hosts. | | 1956 | 13375680 |
| development in vitro of isolated oocysts of plasmodium relictum. | | 1957 | 13463685 |
| [action of combined primaquine-pyrimethamine. i. experimental study on pigeons (columba livia) infected with plasmodium relictum]. | | 1957 | 13474136 |
| a new host record for plasmodium relictum: the silver gull (larus novae-hollandiae stephens). | | 1961 | 13759689 |
| further observations on sporogony cycle of plasmodium relictum in a ddt-resistant strain of culex fatigans. | | 1960 | 13771710 |
| in vitro development of the mosquito phase of plasmodium relictum. | | 1960 | 13796224 |
| [contribution to the study of the influence of the nyctohemeral environment of the host on the multiplication of plasmodium relictum]. | | 1959 | 13815825 |
| infectivity to canaries of sporozoites of plasmodium relictum developing in vitro. | | 1961 | 13864409 |
| the effect of low temperature on plasmodium relictum in culex tarsalis. | | 1962 | 13878142 |
| temperature stresses on the mosquito phase of plasmodium relictum. | | 1964 | 14244806 |
| [latent infection and premunition in malaria in sparrows due to plasmodium relictum]. | | 1960 | 14445035 |
| acquired resistance to chloroguanide in the pigeon strain of plasmodium relictum (grassi and feletti, 1891). | | 1950 | 14795203 |
| observations on the pre-erythrocytic stages of plasmodium relictum, plasmodium cathemerium, and plasmodium gallinaceum in various birds. | | 1951 | 14803745 |
| erythrocyte sedimentation rate in pigeons infected with plasmodium relictum. | | 1951 | 14825027 |
| transmission of plasmodium relictum grassi & feletti by anopheles freeborni aitken. | | 1951 | 14828372 |
| comparative susceptibility of four anopheline mosquitoes to plasmodium relictum. | | 1951 | 14880901 |
| [remarks on the association of plasmodium relictum and plasmodium rouxi malaria in the same birds]. | | 1952 | 14944294 |
| measuring the effects of an ever-changing environment on malaria control. | the effectiveness of malaria control measures depends not only on the potency of the control measures themselves but also upon the influence of variables associated with the environment. environmental variables have the capacity either to enhance or to impair the desired outcome. an optimal outcome in the field, which is ultimately the real goal of vaccine research, will result from prior knowledge of both the potency of the control measures and the role of environmental variables. here we descr ... | 2004 | 15039349 |
| taxonomic status and re-description of plasmodium relictum (grassi et feletti, 1891), plasmodium maior raffaele, 1931, and description of p. bigueti n. sp. in sparrows. | the first accurate re-description of plasmodium relictum (grassi et feletti, 1891) in its type host was provided by raffaele in 1931, and the name relictum should thus refer to this work. in his article, raffaele noted the presence of an associated but distinct species, p. maior. the work of raffaele has since remained overlooked, and the taxon relictum has been applied rather loosely to parasites found in numerous birds of diverse geographic origin. examination of passer domesticus specimens co ... | 2003 | 15267099 |
| pathogenic subspecies of plasmodium relictum found in african birds. | | 2005 | 15786929 |
| parasites affect song complexity and neural development in a songbird. | there is now considerable evidence that female choice drives the evolution of song complexity in many songbird species. however, the underlying basis for such choice remains controversial. the developmental stress hypothesis suggests that early developmental conditions can mediate adult song complexity by perturbing investment in the underlying brain nuclei during their initial growth. here, we show that adult male canaries (serinus canaria), infected with malaria (plasmodium relictum) as juveni ... | 2005 | 16191614 |
| malaria in a captively-produced f1 gyrfalcon and in two f. peregrine falcons. | one falco rusticolus and two of 24 falco peregrinus were positive for plasmodium relictum. sixteen percent of the erythrocytes (rbc) of the gyrfalcon were parasitized. following treatment with chloroquine the parasite burden was dramatically reduced (to less than 0.01%). infection in peregrine falcons was low (0.01-0.4% rbcs were parasitized). this is the second report of plasmodium in the gyrfalcon and the first report in the peregrine falcon. | 1976 | 16502699 |
| mechanism of spring relapse in avian malaria: effect of gonadotropin and corticosterone. | previous work demonstrated that corticosterone induces relapse of avian malaria, and that this effect varies markedly from winter to spring. in the present study, english sparrows with latent plasmodium relictum infections were treated in winter with corticosterone, gonadotropin, corticosterone + gonadotropin, or a control regimen consisting of the oil vehicle. gonadotropin neither induced relapse nor potentiated the induction of relapse by corticosterone. these data cast doubt on the hypothesis ... | 1970 | 16512154 |
| global phylogeographic limits of hawaii's avian malaria. | the introduction of avian malaria (plasmodium relictum) to hawaii has provided a model system for studying the influence of exotic disease on naive host populations. little is known, however, about the origin or the genetic variation of hawaii's malaria and traditional classification methods have confounded attempts to place the parasite within a global ecological and evolutionary context. using fragments of the parasite mitochondrial gene cytochrome b and the nuclear gene dihydrofolate reductas ... | 2006 | 17015360 |
| comparative susceptibility of introduced forest-dwelling mosquitoes in hawai'i to avian malaria, plasmodium relictum. | to identify potential vectors of avian malaria in hawaiian native forests, the innate susceptibility of aedes albopictus, wyeomyia mitchellii, and culex quinquefasciatus from 3 geographical sites along an altitudinal gradient was evaluated using local isolates of plasmodium relictum. mosquitoes were dissected 5-8 and 9-13 days postinfective blood meal and microscopically examined for oocysts and salivary-gland sporozoites. sporogony was completed in all 3 species, but prevalence between species ... | 2005 | 17089752 |
| landscape factors influencing the spatial distribution and abundance of mosquito vector culex quinquefasciatus (diptera: culicidae) in a mixed residential-agricultural community in hawai'i. | mosquito-borne avian diseases, principally avian malaria (plasmodium relictum grassi and feletti) and avian pox (avipoxvirus sp.) have been implicated as the key limiting factor associated with recent declines of endemic avifauna in the hawaiian island archipelago. we present data on the relative abundance, infection status, and spatial distribution of the primary mosquito vector culex quinquefasciatus say (diptera: culicidae) across a mixed, residential-agricultural community adjacent to hawai' ... | 2007 | 17915520 |
| genetic structure and evolved malaria resistance in hawaiian honeycreepers. | infectious diseases now threaten wildlife populations worldwide but population recovery following local extinction has rarely been observed. in such a case, do resistant individuals recolonize from a central remnant population, or do they spread from small, perhaps overlooked, populations of resistant individuals? introduced avian malaria (plasmodium relictum) has devastated low-elevation populations of native birds in hawaii, but at least one species (hawaii amakihi, hemignathus virens) that wa ... | 2007 | 17944845 |
| prevalence and distribution of pox-like lesions, avian malaria, and mosquito vectors in kipahulu valley, haleakala national park, hawai'i, usa. | we determined prevalence and altitudinal distribution of introduced avian malarial infections (plasmodium relictum) and pox-like lesions (avipoxvirus) in forest birds from kipahulu valley, haleakalā national park, on the island of maui, and we identified primary larval habitat for the mosquito vector of this disease. this intensively managed wilderness area and scientific reserve is one of the most pristine areas of native forest remaining in the state of hawai'i, and it will become increasingly ... | 2007 | 17984251 |
| dynamics of parasitemia of malaria parasites in a naturally and experimentally infected migratory songbird, the great reed warbler acrocephalus arundinaceus. | little is known about the development of infection of malaria parasites of the genus plasmodium in wild birds. we used qpcr, targeting specific mitochondrial lineages of plasmodium ashfordi (grw2) and plasmodium relictum (grw4), to monitor changes in intensities of parasitemia in captive great reed warblers acrocephalus arundinaceus from summer to spring. the study involved both naturally infected adults and experimentally infected juveniles. the experiment demonstrated that p. ashfordi and p. r ... | 2008 | 18280472 |
| seasonal variation in plasmodium prevalence in a population of blue tits cyanistes caeruleus. | 1. seasonal variation in environmental conditions is ubiquitous and can affect the spread of infectious diseases. understanding seasonal patterns of disease incidence can help to identify mechanisms, such as the demography of hosts and vectors, which influence parasite transmission dynamics. 2. we examined seasonal variation in plasmodium infection in a blue tit cyanistes caeruleus population over 3 years using sensitive molecular diagnostic techniques, in light of beaudoin et al.'s (1971; journ ... | 2008 | 18312339 |
| blood parasites of house finches (carpodacus mexicanus) from georgia and new york. | this study investigated the ecology of hematozoan parasites in two eastern populations of house finch (carpodacus mexicanus). blood smears were obtained from birds captured in georgia during 2001-2003 (n = 757) and new york during 2001 (n = 282) and evaluated for the presence of hematozoans. low-density infections of haemoproteus fringillae and plasmodium relictum were confirmed at each location. infections were observed year-round in georgia, but primarily between june and november in new york. ... | 2008 | 18436682 |
| genetic characterization of hawaiian isolates of plasmodium relictum reveals mixed-genotype infections. | the relatively recent introduction of a highly efficient mosquito vector and an avian pathogen (plasmodium relictum) to an isolated island ecosystem with naïve, highly susceptible avian hosts provides a unique opportunity to investigate evolution of virulence in a natural system. mixed infections can significantly contribute to the uncertainty in host-pathogen dynamics with direct impacts on virulence. toward further understanding of how host-parasite and parasite-parasite relationships may impa ... | 2008 | 18578879 |
| concurrent infection with clostridium and plasmodium in a captive king penguin aptenodytes patagonicus. | concurrent infection with plasmodium relictum and clostridium perfringens type b was diagnosed in a king penguin (aptenodytes patagonicus) that died in the national zoological gardens, pretoria. macro- and microscopic pathological changes were mainly due to c. perfringens. the relative significance of the two pathogens is discussed. | 1994 | 18671104 |
| dispersal of culex quinquefasciatus (diptera: culicidae) in a hawaiian rain forest. | introduced mosquito-borne pathogens avian malaria (plasmodium relictum grassi and feletti) and avian pox virus (avipoxvirus) have been implicated in the past extinctions and declines of hawaiian avifauna and remain significant obstacles to the recovery and restoration of endemic hawaiian birds. effective management of avian disease will require extensive mosquito control efforts that are guided by the local ecology of the vector culex quinquefasciatus say (diptera: culicidae). during october and ... | 2008 | 18714858 |
| plasmodium relictum (lineage p-sgs1): effects on experimentally infected passerine birds. | we evaluated the effects of plasmodium relictum (lineage p-sgs1), which is a host generalist, to five species of passerine birds. light infection of p. relictum was isolated from a naturally infected adult reed warbler acrocephalus scirpaceus. the parasites were inoculated to naive juveniles of the chaffinch fringilla coelebs, common crossbill loxia curvirostra, house sparrow passer domesticus, siskin spinus spinus and starling sturnus vulgaris. susceptibility of these birds to the infection of ... | 2008 | 18809402 |
| natural immunity and susceptibility of doves and pigeons to pre-erythrocytic and erythrocytic stages of plasmodium relictum. | | 1948 | 18872918 |
| extended persistence of plasmodium relictum in culture. | | 1948 | 18889623 |
| a nucleotide-constrained single base extension method for improved detection of minority alleles in plasmodium. | in genetically mixed plasmodium infections, minority alleles may have a significant role in drug resistance and other responses to selective pressures. many available methods to detect single nucleotide polymorphisms representing minority alleles either are not sensitive enough to detect these rare alleles or are limited in the number of loci to be screened in a single reaction. in order to achieve highly sensitive, multiplex snp genotyping, we have developed a nucleotide-constrained method base ... | 2009 | 19026693 |
| experimental infection of hawai'i 'amakihi (hemignathus virens) with west nile virus and competence of a co-occurring vector, culex quinquefasciatus: potential impacts on endemic hawaiian avifauna. | introduced mosquito-borne avian disease is a major limiting factor in the recovery and restoration of native hawaiian forest birds. annual epizootics of avian pox (avipoxvirus) and avian malaria (plasmodium relictum) likely led to the extinction of some species and continue to impact populations of susceptible hawaiian honeycreepers (drepanidinae). the introduction of a novel pathogen, such as west nile virus (wnv), could result in further population declines and extinctions. during september an ... | 2009 | 19395735 |
| plasmodium relictum (lineage p-sgs1): further observation of effects on experimentally infected passeriform birds, with remarks on treatment with malarone. | plasmodium relictum (lineage p-sgs1) is a widespread malaria parasite that causes disease of different severity in different species of birds. however, experimental studies on the effects of this parasite on avian hosts are uncommon. we investigated development of this lineage in experimentally infected greenfinches carduelis chloris and compared the obtained data with the literature information about the virulence of the same parasite lineage for phylogenetically closely related bird species. w ... | 2009 | 19545566 |
| bloodmeal identification and detection of avian malaria parasite from mosquitoes (diptera: culicidae) inhabiting coastal areas of tokyo bay, japan. | bloodmeal identification and the detection of avian malaria parasite from mosquitoes (diptera: culicidae) were carried out by polymerase chain reaction-based methods for field samples collected in coastal areas of tokyo bay, japan, from april to october 2007. the following seven mosquito species were collected: aedes albopictus (skuse), culex pipiens pallens coquillett, culex pipiens form molestus forskal, culex tritaeniorhynchus giles, culex inatomii kamimura & wada, culex bitaeniorhynchus gile ... | 2009 | 19769059 |
| thermal constraints to the sporogonic development and altitudinal distribution of avian malaria plasmodium relictum in hawai'i. | more than half of the hawaiian honeycreepers (drepanidinae) known from historical records are now extinct. introduced mosquito-borne disease, in particular the avian malaria plasmodium relictum , has been incriminated as a leading cause of extinction during the 20th century and a major limiting factor in the recovery of remaining species populations. today, most native hawaiian bird species reach their highest densities and diversity in high elevation (>1,800 m above sea level) forests. we deter ... | 2010 | 20001096 |
| history of the discovery of the malaria parasites and their vectors. | abstract: malaria is caused by infection with protozoan parasites belonging to the genus plasmodium transmitted by female anopheles species mosquitoes. our understanding of the malaria parasites begins in 1880 with the discovery of the parasites in the blood of malaria patients by alphonse laveran. the sexual stages in the blood were discovered by william maccallum in birds infected with a related haematozoan, haemoproteus columbae, in 1897 and the whole of the transmission cycle in culicine mos ... | 2010 | 20205846 |
| the response of blood-inoculated and sporozoite-induced infections of plasmodium relictum to drugs. | | 1947 | 20255202 |
| extended persistence of oocysts of plasmodium relictum in culture. | | 1947 | 20271937 |
| growth of protozoa in tissue culture; plasmodium relictum, exoerythrocytic forms. | | 1946 | 20275229 |
| the morphology of cryptozoites and metacryptozoites of plasmodium relictum and the relationship of these stages to parasitemia in canaries and pigeons. | | 1947 | 20292843 |
| [extraerythrocytic form of plasmodium relictum]. | | 1946 | 20341110 |
| effect of repeated exposure to plasmodium relictum (lineage sgs1) on infection dynamics in domestic canaries. | parasites are known to exert strong selection pressures on their hosts and, as such, favour the evolution of defence mechanisms. the negative impact of parasites on their host can have substantial consequences in terms of population persistence and the epidemiology of the infection. in natural populations, however, it is difficult to assess the cost of infection while controlling for other potentially confounding factors. for instance, individuals are repeatedly exposed to a variety of parasite ... | 2010 | 20570591 |
| identification of plasmodium relictum causing mortality in penguins (spheniscus magellanicus) from são paulo zoo, brazil. | this study reports avian malaria caused by plasmodium relictum in magellanic penguins (spheniscus magellanicus) from são paulo zoo. the disease was highly infective among the birds and was clinically characterized by its acute course and high mortality. the penguins of são paulo zoo were housed for at least 2 years without malaria; however, they had always been maintained in an enclosure protected from mosquito exposure during the night period. when they presented pododermatitis, they were freed ... | 2010 | 20638795 |
| hemosporidian blood parasites in seabirds--a comparative genetic study of species from antarctic to tropical habitats. | whereas some bird species are heavily affected by blood parasites in the wild, others reportedly are not. seabirds, in particular, are often free from blood parasites, even in the presence of potential vectors. by means of polymerase chain reaction, we amplified a dna fragment from the cytochrome b gene to detect parasites of the genera plasmodium, leucocytozoon, and haemoproteus in 14 seabird species, ranging from antarctica to the tropical indian ocean. we did not detect parasites in 11 of the ... | 2010 | 20652673 |
| larval habitat for the avian malaria vector culex quinquefasciatus (diptera: culicidae) in altered mid-elevation mesic-dry forests in hawai'i. | effective management of avian malaria (plasmodium relictum) in hawai'i's endemic honeycreepers (drepanidinae) requires the identification and subsequent reduction or treatment of larval habitat for the mosquito vector, culex quinquefasciatus (diptera: culicidae). we conducted ground surveys, treehole surveys, and helicopter aerial surveys from 2001-2003 to identify all potential larval mosquito habitat within two 100+ ha mesic-dry forest study sites in hawai'i volcanoes national park, hawai'i; ' ... | 2009 | 20836824 |
| plasmodium relictum infection and mhc diversity in the house sparrow (passer domesticus). | antagonistic coevolution between hosts and parasites has been proposed as a mechanism maintaining genetic diversity in both host and parasite populations. in particular, the high level of genetic diversity usually observed at the major histocompatibility complex (mhc) is generally thought to be maintained by parasite-driven selection. among the possible ways through which parasites can maintain mhc diversity, diversifying selection has received relatively less attention. this hypothesis is based ... | 2010 | 20943698 |
| the relation of natural and acquired immunity of various avian hosts to the cryptozoites and metacryptozoites of plasmodium gallinaceum and plasmodium relictum. | | 1946 | 21025253 |
| plasmodium relictum (lineage sgs1) and plasmodium ashfordi (lineage grw2): the effects of the co-infection on experimentally infected passerine birds. | the effects of avian malaria parasites of the genus plasmodium on their hosts are insufficiently understood. this is particularly true for malarial co-infections, which predominant in many bird populations. we investigated effects of primary co-infection of plasmodium relictum (lineage sgs1) and plasmodium ashfordi (grw2) on experimentally infected naive juveniles of siskin spinus spinus, crossbill loxia curvirostra and starling sturnus vulgaris. all siskins and crossbills were susceptible but s ... | 2010 | 21050849 |
| insecticide resistance and malaria transmission: infection rate and oocyst burden in culex pipiens mosquitoes infected with plasmodium relictum. | the control of most vectors of malaria is threatened by the spread of insecticide resistance. one factor that has been hitherto largely overlooked is the potential effects of insecticide resistance on the ability of mosquitoes to transmit malaria: are insecticide-resistant mosquitoes as good vectors of plasmodium as susceptible ones? the drastic physiological changes that accompany the evolution of insecticide resistance may indeed alter the ability of vectors to transmit diseases, a possibility ... | 2010 | 21194433 |
| fitness effects of endemic malaria infections in a wild bird population: the importance of ecological structure. | 1. parasites can have important effects on host populations influencing either fecundity or mortality, but understanding the magnitude of these effects in endemic host-parasite systems is challenging and requires an understanding of ecological processes affecting both host and parasite. 2. avian blood parasites (haemoproteus and plasmodium) have been much studied, but the effects of these parasites on hosts in areas where they are endemic remains poorly known. 3. we used a multistate modelling f ... | 2011 | 21426343 |
| does avian malaria infection affect feather stable isotope signatures? | it is widely accepted that stable isotope ratios in inert tissues such as feather keratin reflect the dietary isotopic signature at the time of the tissue synthesis. however, some elements such as stable nitrogen isotopes can be affected by individual physiological state and nutritional stress. using malaria infection experiment protocols, we estimated the possible effect of malaria parasite infections on feather carbon (+¦(13)c) and nitrogen (+¦(15)n) isotope signatures in juvenile common cross ... | 2011 | 21671039 |
| malaria parasites (plasmodium spp.) infecting introduced, native and endemic new zealand birds. | avian malaria is caused by intracellular mosquito-transmitted protist parasites in the order haemosporida, genus plasmodium. although plasmodium species have been diagnosed as causing death in several threatened species in new zealand, little is known about their ecology and epidemiology. in this study, we examined the presence, microscopic characterization and sequence homology of plasmodium spp. isolates collected from a small number of new zealand introduced, native and endemic bird species. ... | 2011 | 21842389 |
| Presence and seasonal prevalence of Plasmodium spp. in a rare endemic New Zealand passerine (tieke or Saddleback, Philesturnus carunculatus). | The conservation and management of Saddlebacks (Philesturnus carunculatus) and other New Zealand birds, currently relies on the translocation of individuals to predator-free sites. Avian malaria has been identified as one of the diseases to be tested for prior to translocations in New Zealand, with the aim of translocating disease-free individuals. We describe avian malaria lineages and their seasonal prevalence in 2007-2008 in Saddlebacks from Mokoia Island, a source of birds for translocations ... | 2011 | 22102656 |
| parasitological and new molecular-phylogenetic characterization of the malaria parasite plasmodium tejerai in south american penguins. | this study is the first report on mortality of spheniscus magellanicus, penguin of south america, caused by plasmodium tejerai, which was identified using morphological and molecular analyses. blood stages (trophozoites, meronts and gametocytes) were reported and illustrated. the necropsy revealed marked splenomegaly and pulmonary edema, as well as moderate hepatomegaly and hydropericardium. the histopathology revealed the presence of tissue meronts in the macrophages and endothelial cells of mu ... | 2012 | 23269202 |
| wolbachia increases susceptibility to plasmodium infection in a natural system. | current views about the impact of wolbachia on plasmodium infections are almost entirely based on data regarding artificially transfected mosquitoes. this work has shown that wolbachia reduces the intensity of plasmodium infections in mosquitoes, raising the exciting possibility of using wolbachia to control or limit the spread of malaria. whether natural wolbachia infections have the same parasite-inhibiting properties is not yet clear. wolbachia-mosquito combinations with a long evolutionary h ... | 2014 | 24500167 |
| evolution of plastic transmission strategies in avian malaria. | malaria parasites have been shown to adjust their life history traits to changing environmental conditions. parasite relapses and recrudescences--marked increases in blood parasite numbers following a period when the parasite was either absent or present at very low levels in the blood, respectively--are expected to be part of such adaptive plastic strategies. here, we first present a theoretical model that analyses the evolution of transmission strategies in fluctuating seasonal environments an ... | 2014 | 25210974 |
| transgenerational effect of infection in plasmodium-infected mosquitoes. | transgenerational effects of infection have a huge potential to influence the prevalence and intensity of infections in vectors and, by extension, disease epidemiology. these transgenerational effects may increase the fitness of offspring through the transfer of protective immune factors. alternatively, however, infected mothers may transfer the costs of infection to their offspring. although transgenerational immune protection has been described in a dozen invertebrate species, we still lack a ... | 0 | 25762571 |
| mosquito age and avian malaria infection. | the immune system of many insects wanes dramatically with age, leading to the general prediction that older insects should be more susceptible to infection than their younger counterparts. this prediction is however challenged by numerous studies showing that older insects are more resistant to a range of pathogens. the effect of age on susceptibility to infections is particularly relevant for mosquitoes given their role as vectors of malaria and other diseases. despite this, the effect of mosqu ... | 2015 | 26424326 |
| exposure of the mosquito vector culex pipiens to the malaria parasite plasmodium relictum: effect of infected blood intake on immune and antioxidant defences, fecundity and survival. | the intake of a plasmodium-infected blood meal may affect mosquito physiology and a series of trade-offs may occur, in particular between immune defences, reproduction and self-maintenance. we evaluated the cost of exposure to plasmodium in the mosquito vector by investigating the effect of exposure on fecundity and survival and the implication of immune and antioxidant defences in mediating this cost. | 2016 | 27899136 |
| avian malaria: a new lease of life for an old experimental model to study the evolutionary ecology of plasmodium. | avian malaria has historically played an important role as a model in the study of human malaria, being a stimulus for the development of medical parasitology. avian malaria has recently come back to the research scene as a unique animal model to understand the ecology and evolution of the disease, both in the field and in the laboratory. avian malaria is highly prevalent in birds and mosquitoes around the world and is amenable to laboratory experimentation at each stage of the parasite's life c ... | 0 | 26150666 |