| junin virus activity in rodents from endemic and nonendemic loci in central argentina. | small mammals were trapped during a 21-month period at 27 farm sites in 15 localities within and beyond the known endemic area for argentine hemorrhagic fever (ahf). prevalence of junin virus (jv) was assessed by antigen-capture enzyme immunoassay (elisa) on samples of body fluids and/or organs from 3, 282 captured rodents. infection in rodent populations was variable (0-3.7%) among localities but, in all cases, was lower than previously reported rates. overall prevalence was 1.4% in the ahf epi ... | 1991 | 1650148 |
| bot fly parasitism (rogenhofera bonaerensis) (diptera, cuterebridae) in the pampean grassland mouse (akodon azarae), in argentina. | seasonality and impact of parasitism by the larvae of rogenhofera bonaerensis (diptera: cuterebridae) in pampean grassland mouse (akodon azarae, rodentia, cricetidae) populations were studied in grasslands and cropfield borders near diego gaynor (buenos aires province, argentina), from november 1985 to december 1986. trapped mice infections ranged from one larva (77%) to four (4%) per host; larvae occurred on tails (75.7%), backs (17.1%), thighs (5.7%), and abdomen (1.4%). prevalence of larvae o ... | 1990 | 2406466 |
| calomys callidus as a potential junin virus reservoir. | the present study investigated whether c. callidus, a species belonging to the calomys genus, is capable of developing experimentally a persistent junin virus (jv) infection. newborn and adult cricetids were inoculated with the attenuated xj-clone 3 strain of jv by intracerebral or mucosal route. the present results indicate that the species is susceptible to jv infection, capable of shedding virus chronically through saliva and developing a persistent infection as shown by the detection of viru ... | 1989 | 2542433 |
| the sex-determining zinc finger sequences in xy females of akodon azarae (rodentia, cricetidae). | wild populations of akodon azarae comprise females with a karyotype indistinguishable from that of males. these individuals were formerly assumed to be xx, the x being an x chromosome with a deletion of most of its long arm. by using a dna probe derived from the testis-determining region of the human y chromosome (comprising a candidate gene for the testis-determining factor, y-linked zinc finger [zfy]), we demonstrate that a. azarae gonosomally variant females are xy and not xx. the zfy sequenc ... | 1989 | 2698322 |
| epidemiology of argentine hemorrhagic fever. | present knowledge points to horizontal transmission as the most significant mechanism for junín virus maintenance in the main natural reservoirs, namely calomys musculinus and calomys laucha. the existence of naturally infected akodon azarae, both within and outside the endemic area, as well as the finding that other species, ecologically and phylogenetically related to the main reservoirs, such as akodon molinae and calomys callidus, can experimentally develop persistent infections with virus s ... | 1988 | 2841151 |
| the chromosomes of the field mouse akodon azarae (cricetidae, rodentia) with special reference to sex chromosome anomalies. | | 1967 | 5587540 |
| offspring sex-ratio and reproductive performance in heterogametic females of the south american field mouse akodon azarae. reproduction in heterogametic akodon azarae females. | we have compared the breeding performance of homogametic (xx) and heterogametic (xy*) females of the south american sigmodontine rodent akodon azarae under laboratory conditions. xy* females showed an enhanced reproductive performance when compared with normal, xx, females. the xy* females had a longer reproductive lifespan. they started to reproduce early, had more frequent litters, and stopped reproduction later than xx females. their progeny showed a biased 1:2 male:female sex ratio which may ... | 1996 | 8690614 |
| environmental factors associated with rodent infestations in argentine poultry farms. | 1. seasonal variations in rodent infestations were studied at poultry farms in central argentina as well as the environmental factors associated with rodent infestations at poultry farms. 2. during the summer and winter of 1998 rodent infestation was monitored at 10 poultry farms by means of tracking stations, and 21 environmental variables were selected that a priori could be related with the extent of rodent infestation. 3. there was a higher rodent infestation in winter than in summer. 4. spe ... | 2001 | 11469547 |
| fast-developing preimplantation embryo progeny from heterogametic females in mammals. | karyotyping and cell number estimates in preimplantation embryos from heterogametic (xy*) and homogametic (xx) females of the field mouse akodon azarae were studied to determine whether xx-xy-xy* differences exist in the rate of preimplantation development. at the morula stage, xy embryos from heterogametic mothers had twice the mean number of cells compared with xx embryos. however, this difference in cell numbers was not seen between xx and xy embryos from homogametic mothers. in this case, me ... | 2001 | 11771894 |
| mites (acari: laelapidae) associated with sigmodontinae rodents in entre ríos province, argentina. | the richness, diversity, abundance and prevalence of mite species associated with sigmodontine rodents of different species in entre ríos province, argentina are studied. five of the six species of mites were reported for the first time in the study area. the richness and diversity of mites was higher on oligoryzomys flavescens and o. delticola than on akodon azarae. androlaelaps rotundus was dominant and exhibited higher values of mean abundance and prevalence on a. azarae, mysolaelaps microspi ... | 2001 | 11784942 |
| two new species of nippostrongylinae (nematoda: trichostrongylina: heligmonellidae) from the grey leaf-eared mouse graomys griseoflavus (sigmodontinae) in argentina. | two new species of nippostrongylinae, hassalstrongylus puntanus n. sp., and stilestrongylus franciscanus n. sp. are described from the intestine of the grey leaf-eared mouse graomys griseoflavus (waterhouse, 1837) (sigmodontinae) from the province of san luis, argentina. hassalstrongylus puntanus n. sp. is distinguished from the most closely related species h. dollfusi (díaz-ungría, 1963), a parasite of mus musculus from venezuela by longer rays 2, shorter rays 4, proximal half of the dorsal ray ... | 2003 | 12669346 |
| interrelationship between ectoparasites and wild rodents from northeastern buenos aires province, argentina. | infestation parameters and indices of mites, ticks and fleas associated with wild rodents from northeastern buenos aires province, argentina, were studied. host species similarity was also analyzed in relation to their ectoparasites. fifty-five rodents were captured from january 2000 to march 2001. in total, 1,022 ectoparasites were collected and three ectoparasite-host associations were new records. however, this is the first study on craneopsylla minerva wolffhuegeli infesting parameters. ecto ... | 2003 | 12700861 |
| associations between leptospiral infection and seropositivity in rodents and environmental characteristics in argentina. | our objective was to look for associations between leptospiral infection in rodents and selected environmental and rodent characteristics in santa fe, argentina. rodents (n = 214) were trapped alive from january 1998 to december 1999 in three environmental settings. kidneys from 118 rodents were cultured and serum samples from 201 were processed by enzyme-linked immunosorbent assay (elisa). logistic regression was performed with elisa seropositivity as the dependent variable and rodent character ... | 2003 | 12900160 |
| arthropod and filarioid parasites associated with wild rodents in the northeast marshes of buenos aires, argentina. | during 1995, 16 species of arthropods and 2 species of filarioids, totaling 1 287 specimens were collected from 64 wild rodents captured in the hudson natural reserve, buenos aires, argentina. infestation parameters and indexes were analyzed. host specific richness was s = 6, diversity h = 1.48, and relative density rdi = 40%. high values of parasite species richness and diversity were found on oligoryzomys delticola (s = 9; h = 1.40), oxymycterus rufus (s = 9; h = 1.37), and oligoryzomys flaves ... | 2003 | 12973536 |
| prevalence of infection with hantavirus in rodent populations of central argentina. | we studied hantavirus seroprevalence and virus variability in rodent populations in diego gaynor, northwest of buenos aires province, argentina. rodent samplings were conducted in railroads and cropfield borders in march and july 1999, september and december 2000, and march 2001. antibody detection was performed by an enzyme link immunosorbent assay (elisa), using the recombinant nucleoprotein of andes (and) virus as antigen. tissue samples were taken from positive antibody individuals in order ... | 2003 | 14595446 |
| the parasitism of immature stages of ixodes loricatus (acari: ixodidae) on wild rodents in argentina. | ixodes loricatus has long been considered with strict-total specificity to new world marsupials. however, frequent findings of its immature stages on rodents suggest that these vertebrates play an important role in the tick's life cycle. aspects dealing with the ecology of sigmodontinae rodents infestation by i. loricatus are unknown. to contribute to the knowledge of the ecology of this tick species, environmental factors, as well as host species, sex and age, were evaluated to find association ... | 2005 | 16082931 |
| description of adult and fourth-stage larva of litomosoides navonae n. sp. (nematoda: onchocercidae), a parasite of five species of sigmodontine rodents from northeastern argentina. | this study describes a new species of litomosoides chandler, 1931, parasitic in five different sigmodontine rodents from misiones, chaco and formosa provinces of argentina. the fourth-stage (l4) larva (male and female) is also described. l. navonae n. sp. exhibits: a bottle-shaped buccal cavity; a buccal capsule with irregularly crenate external walls; four externo-labial papillae and one ventral cephalic papilla; a well differentiated oesophagus; and sigmodontis-type spicules. the microfilaria ... | 2005 | 16315077 |
| trichostrongylina (nematoda) parasitic in phyllotis sp. (rodentia: sigmodontinae) from argentina, with description of three new species. | the trichostrongylina parasitic in the leaf-eared mouse phyllotis sp. (sigmodontinae) from the province of catamarca, argentina are studied. three new species of stilestrongylus freitas, lent and almeida, 1937 (heligmosomoidea: heligmonellidae: nippostrongylinae) are described. stilestrongylus andalgala n. sp. is distinguished from the most closely related species s. moreli diaw, 1976 parasitic in auliscomys boliviensis from bolivia, by the absence of a common trunk of right rays 2 and 3, by lef ... | 2007 | 17129752 |
| redescription of trichuris laevitestis (nematoda: trichuridae) from akodon azarae and scapteromys aquaticus (sigmodontinae: cricetidae) in buenos aires province, argentina. | trichuris spp. have a cosmopolitan distribution; the species are typically identified by features related to the reproductive system. trichuris laevitestis was described on the basis of specimens collected from rodents captured in punta lara, buenos aires province, argentina. here, t. laevitestis is redescribed considering new and relevant morphological features of diagnostic importance such as arrangement of spines on the spicular sheath, spicule length, length and shape of proximal cloacal tub ... | 2006 | 17152950 |
| a new species of syphacia (nematoda: oxyuridae) from akodon azarae (rodentia: cricetidae) in argentina. | eight species of syphacia (nematoda: oxyuridae) have been reported from south america in rodents of the sigmodontinae, only 1 of which has been recorded in argentina. syphacia (syphacia) carlitosi n. sp. is described from the ceca of akodon azarae bibianae and akodon azarae hunteri (sigmodontinae: akodontini) captured in 3 provinces in the northeast region of argentina. the new species is differentiated principally by the shape of the cephalic plate; distribution of submedian papillae and amphid ... | 2007 | 17539423 |
| a longitudinal study of hantavirus infection in three sympatric reservoir species in agroecosystems on the argentine pampa. | prevalence of antibody reactive with sin nombre hantavirus (snv) was evaluated from rodents captured over 31 months (march 1988 to september 1990) from six mark-recapture grids on the central argentine pampa. the most frequently infected rodents were: akodon azarae (31/459), necromys benefactus (8/141), and oligoryzomys flavescens (10/281), which are known hosts of pergamino, maciel, and lechiguanas hantaviruses, respectively. relative population density and antibody prevalence varied seasonally ... | 2007 | 17627443 |
| infection pattern of the spirurid nematode protospirura numidica criceticola in the cricetid rodent akodon azarae on poultry farms of central argentina. | the nematode protospirura numidica criceticola infects the stomach of neotropical cricetid rodents when they ingest infected arthropods. in north america, prevalence values fluctuated, showing marked peaks in desert habitats, while remaining low in humid environments. the infection pattern has not been studied in south american rodents. in this work, yearly infection by p. n. criceticola was analysed in the south american cricetid akodon azarae seasonally captured from july 1998 to july 2000 and ... | 2008 | 18298867 |
| a new angiostrongylid (nematoda) species from the pulmonary arteries of akodon azarae (rodentia: cricetidae) in argentina. | angiostrongylus morerai n. sp. (nematoda: angiostrongylidae) is described from the pulmonary arteries of azara's grass mouse akodon azarae (rodentia: cricetidae) in argentina. it is distinguished from its congeners principally by the morphology of the dorsal ray, which is as long, or longer, than the externodorsals and has 2 long branches; the spicule lengths are also greater (400-465 microm). this is the first record of a metastrongyloid from sigmodontine rodents in argentina. | 2008 | 18564753 |
| a new species of liniscus (nematoda: trichuridae) from oxymycterus rufus and akodon azarae (cricetidae: sigmodontinae) in buenos aires province, argentina. | liniscus diazae n. sp. (nematoda: trichuridae) is described from the urinary bladder of oxymycterus rufus and akodon azarae (cricetidae: sigmodontinae) from buenos aires province, argentina. liniscus diazae can be differentiated from its congeners by having a much longer spicule and without an elevated vulva. in addition, l. diazae can be distinguished from l. incrassatus and l. himizu by having a longer body length. males are similar in posterior width to l. papillosus and l. himizu, but thinne ... | 2008 | 18576745 |
| determinants of ectoparasite assemblage structure on rodent hosts from south american marshlands: the effect of host species, locality and season. | the relative effects of host species identity, locality and season on ectoparasite assemblages (relative abundances and species richness) harboured by four cricetid rodent hosts (akodon azarae, oligoryzomys flavescens, oxymycterus rufus and scapteromys aquaticus) were assessed across six closely located sites in buenos aires province, argentina. relative abundances of ectoparasites (14 species including gamasid mites, an ixodid tick, a trombiculid mite, lice and fleas), as well as total ectopara ... | 2010 | 20546127 |
| diversity of the helminth community of the pampean grassland mouse ( akodon azarae) on poultry farms in central argentina. | this paper describes the helminth community of the pampean grassland mouse (akodon azarae) inhabiting poultry farms in central argentina. winter diversity (season of high rodent abundance) has been compared to spring diversity (season of low rodent abundance). species richness was seven in both seasons: five nematodes (syphacia carlitosi, stilestrongylus spp., trichuris laevitestis, pterygodermatites (paucipectines) azarai and protospirura numidica criceticola) and two cestodes (adults of cyclop ... | 2011 | 21324218 |
| seasonal dynamics and hosts of amblyomma triste (acari: ixodidae) in argentina. | the seasonal dynamics and host usage of amblyomma triste in argentina were analyzed. adults of a. triste were present from early winter to mid-summer, with the peak of abundance from late winter to mid-spring (august to october). larvae and nymphs were found from december to june, with the peak of abundance in summer. there were no differences among the biological parameters (pre-moult period of larvae and nymphs, pre-oviposition period of females, and minimum incubation period of eggs) of engor ... | 2011 | 21536384 |
| hantavirus ecology in rodent populations in three protected areas of argentina. | in this study, we identified hantavirus genotypes and their reservoirs and evaluated the spatial and temporal distribution of the virus in rodent population in three protected areas of argentina over 3ôçâyears (2007-2010). a total of 837 rodents were captured with an effort of 22ôçâ117 trap-nights. we detected the genotype lechiguanas in oligoryzomys nigripes and o.-áflavescens and pergamino in akodon azarae. there was no correlation between seroprevalence and trap success of the host. the propo ... | 2011 | 21733047 |
| factors affecting patterns of amblyomma triste (acari: ixodidae) parasitism in a rodent host. | here we offer a multivariable analysis that explores associations of different factors (i.e., environmental, host parameters, presence of other ectoparasites) with the interaction of amblyomma triste immature stages and one of its main hosts in argentina, the rodent akodon azarae. monthly and for two years, we captured and sampled rodents at 16 points located at 4 different sites in the parana river delta region. the analyses were conducted with generalized linear mixed models with a negative bi ... | 2015 | 26104965 |
| new species and records of the mite genus prolistrophorus (acariformes: listrophoridae) from rodents of the subfamily sigmodontinae (rodentia: cricetidae). | six fur-mite species of the genus prolistrophorus fain, 1970 (acariformes: listrophoridae) were recorded from central and south american rodents of the subfamily sigmodontinae (rodentia: cricetidae). among them, prolistrophorus (aprolistrophorus) parabidentatus sp. nov. from akodon azarae from argentina and prolistrophorus (aprolistrophorus) tylomys sp. nov. from tylomys nudicaudus from guatemala are described as new for science. new hosts are recorded for the following species: prolistrophorus ... | 2014 | 25236266 |
| environmental variables associated with hantavirus reservoirs and other small rodent species in two national parks in the paraná delta, argentina: implications for disease prevention. | hantavirus pulmonary syndrome (hps) is a severe zoonotic disease caused by hantaviruses hosted in various rodents species. in argentina, its transmission to humans has been associated to exposure during activities such as farming, recreation, and tourism which are carried out in wild and rural areas. the aim of this study was to analyze the macro- and micro-habitat use and spatio-temporal variation of small sylvan rodents in pre delta and islas de santa fe national parks, located in an hps-endem ... | 2016 | 27169561 |
| evaluation of habitat requirements of small rodents and effectiveness of an ecologically-based management in a hantavirus-endemic natural protected area in argentina. | hantavirus pulmonary syndrome is a severe cardio pulmonary disease transmitted to humans by sylvan rodents found in natural and rural environments. disease transmission is closely linked to the ecology of animal reservoirs and abiotic factors such as habitat characteristics, season or climatic conditions. the main goals of this research were: to determine the biotic and abiotic factors affecting richness and abundance of rodent species at different spatial scales, to evaluate different methodolo ... | 2017 | 27135773 |
| ecology of the interaction between ixodes loricatus (acari: ixodidae) and akodon azarae (rodentia: criceridae). | the present study explores associations of different factors (i.e. host parameters, presence of other ectoparasites and [mainly biotic] environmental factors) with burdens of ixodes loricatus immature stages in one of its main hosts in argentina, the rodent akodon azarae. for 2 years, rodents were trapped and sampled monthly at 16 points located in four different sites in the parana river delta region. data were analysed with generalized linear mixed models with a negative binomial response (cou ... | 2015 | 26122994 |
| daily movements and microhabitat selection of hantavirus reservoirs and other sigmodontinae rodent species that inhabit a protected natural area of argentina. | abundance, distribution, movement patterns, and habitat selection of a reservoir species influence the dispersal of zoonotic pathogens, and hence, the risk for humans. movements and microhabitat use of rodent species, and their potential role in the transmission of hantavirus were studied in otamendi natural reserve, buenos aires, argentina. movement estimators and qualitative characteristics of rodent paths were determined by means of a spool and line device method. sampling was conducted durin ... | 2015 | 26063039 |
| seasonality of immature stages of ixodes loricatus (acari: ixodidae) in the paraná delta, argentina. | in this study we analyzed seasonal trends of immature stages of ixodes loricatus parasitizing akodon azarae (sigmodontinae) in a locality of the paraná delta, buenos aires, argentina. the data encompassed two consecutive years and the analysis included the control of potential confounders using generalized linear mixed models (glmm) with a negative binomial response. larvae had within-year differences in abundance, but the peak months differed drastically between both sampling years, indicating ... | 2014 | 25113986 |
| histopathology associated with angiostrongylosis in akodon species (rodentia: sigmodontinae) from sierra de la ventana, buenos aires, argentina. | angiostrongylus is a metastrongylid nematode genus that includes species found in carnivores, rodents, and occasionally primates (including humans). about 100 species of wild sigmodontine rodents occur in argentina, 16 of which are species of akodon. the lungs of akodon azarae and akodon dolores from sierra de la ventana, buenos aires, argentina, were examined, and 2 of 10 a. dolores specimens were positive for angiostrongylosis, showing macroscopic lesions of verminous pneumonia. adults found w ... | 2012 | 22663763 |
| temporal niche overlap among insectivorous small mammals. | being active in the same environment at different times exposes animals to the effects of very different environmental factors, both biotic and abiotic. in the present study, we used live traps equipped with timing devices to evaluate the potential role of biotic factors (competition and food abundance) on overall overlap in the temporal niche axis of 4 insectivorous small mammals in high-elevation grassland fields ('campos de altitude') of southern brazil. based on resources availability (inver ... | 2011 | 22182329 |
| isolation of microsatellite loci in akodon azarae (muridae, sigmodontinae) and cross-amplification in other akodontini species. | | 2011 | 21677411 |
| a new species of syphacia (nematoda: oxyuridae) from calomys laucha (rodentia: cricetidae) in an agroecosystem of central argentina. | a new oxyurid nematode syphacia hodarae n. sp. is described from the cecum and rectum of the cricetid rodent calomys laucha fischer, 1814 (sigmodontinae, phyllotini), captured in an agroecosystem of central argentina. the new species is distinguished from other members of the genus mainly by the shape of the cephalic plate, presence of cervical alae in females, absence of lateral alae, and absence of deirids. some characters are shared with syphacia carlitosi, a parasite of akodon azarae from th ... | 2011 | 21506826 |
| ectoparasite occurrence associated with males and females of wild rodents oligoryzomys flavescens (waterhouse) and akodon azarae (fischer) (rodentia: cricetidae: sigmodontinae) in the punta lara wetlands, argentina. | the objective of this research was to study infestation parameters and indexes of ectoparasites associated with each sex of the wild rodents oligoryzomys flavescens (waterhouse) andakodon azarae (fischer) in the punta lara wetlands, argentina. a trend towards higher mean abundance (ma) and ectoparasite specific richness was observed in males of o. flavescens whereas those values were similar for both a. azarae sexes. the prevalence of the following ectoparasites was significantly higher on males ... | 2010 | 21120393 |
| phenotypic plasticity in response to low quality diet in the south american omnivorous rodent akodon azarae (rodentia: sigmodontinae). | we studied the responses in the omnivorous rodent a. azarae submitted to a low quality diet at morphological, physiological and biochemical levels. at short term, a decrease in body mass occurred. a later increase in food consumption constituted a strategy that allowed a temporal recovery of physical condition. however, hyperphagia appeared not to be enough to maintain physical condition after 30 days of low quality diet consumption. at the morphological level, an increase in length (9%) of the ... | 2006 | 16959512 |
| phenotypic flexibility of digestive morphology and physiology of the south american omnivorous rodent akodon azarae (rodentia: sigmodontinae). | we have determined the occurrence of responses at different levels (morphological, physiological and biochemical) in the omnivorous rodent akodon azarae upon cold acclimation (15 degrees c). a short-term enhancement in food consumption appeared to account for the maintenance of both mass and body composition. at the morphological level, the main response was an increase in the dimensions of small intestine, which constitutes the section of the gut where absorption and secretion take place. an in ... | 2004 | 15596396 |
| unequal transmission of mitochondrial haplotypes in natural populations of field mice with xy females (genus akodon). | in species with fertile xy females, such as south american field mice (genus akodon), there are two types of mitochondrial dna (mtdna), one passing from xx females and one from xy females. the xx mothers pass their mtdna to their xx daughters. the xy mothers, however, produce both xx and xy daughters. because of this breeding scheme, the xy mtdna remains isolated whereas the xx lineage is continuously invaded by xy mtdna haplotypes. using a set of recursion equations, i predicted that xy mtdna h ... | 2003 | 12650460 |
| assessing the effect of litter size on growth pattern and homeothermy acquisition in the pampas mice akodon azarae (rodentia, muridae). | we evaluated in pups of akodon azarae both the growth pattern from birth to 48 days of age and the effect of litter size on growth pattern and homeothermy acquisition from birth to weaning age. individual pups gained weight as expected by a gompertz growth pattern. until weaning, litter size affected both the slope of the relationship between body temperature and age and the rate of growth of pups. pups from small litters increased both body temperature and weight until body temperature and body ... | 2002 | 12537300 |
| reproductive energetics and thermoregulatory status of nestlings in pampas mice akodon azarae (rodentia: sigmodontinae). | we evaluated metabolic rates during reproduction and the thermoregulatory status of preweaning pups of akodon azarae (fisher 1829). metabolic rates during late pregnancy and lactation were 159% and 200%, respectively, of the basal metabolic rate. metabolic rates of 10-d-old pups were 447% of the adult's metabolic rates. no difference in metabolic rates of pups was detected among different ambient temperatures. differences were detected in body temperatures between pups without mothers before and ... | 2006 | 11331503 |
| meiotic behavior of gonosomically variant females of akodon azarae (rodentia, cricetidae). | the meiotic behavior of sex chromosomes has been investigated in variant females of akodon azarae, both in pachytene oocytes and metaphase i. in somatic cells, these females have a heteromorphic sex pair, in which the minor chromosome has been previously interpreted as a major deletion of the long arm of the x chromosome (dx). after microspreading for synaptonemal complex analysis, pachytene oocytes show two axes of very different lengths (100:17.1), which correspond to the sex chromosomes x and ... | 1989 | 2692976 |
| genetic polymorphism in populations of akodon rodents. | by means of starch gel electrophoresis, 16-20 loci coding for enzymes and hemoglobin have been investigated in six population samples of akodon dolores, captured in a single site of the córdoba province (argentina) during a 3-year period and in three samples of an akodon azarae population. proportion of polymorphic loci (p) ranged from 0.278 to 0.389 in a. dolores and from 0.166 to 0.300 in a. azarae. mean heterozygosity (h) ranged from 0.138 to 0.192 in a. dolores and from 0.099 to 0.118 in a. ... | 1985 | 3886105 |
| intrinsic and extrinsic factors related to pathogen infection in wild small mammals in intensive milk cattle and swine production systems. | understanding the ecological processes that are involved in the transmission of zoonotic pathogens by small mammals may aid adequate and effective management measures. few attempts have been made to analyze the ecological aspects that influence pathogen infection in small mammals in livestock production systems. we describe the infection of small mammals with leptospira spp., brucella spp., trichinella spp. and cysticercus fasciolaris and assess the related intrinsic and extrinsic factors in liv ... | 2017 | 28665952 |
| rodent abundance and hantavirus infection in protected area, east-central argentina. | we captured 3 hantavirus rodent hosts in otamendi natural reserve, argentina, during 2007-2012. hantavirus antibodies were found only in akodon azarae grass mice, mainly in males and old animals. higher abundance of this species was associated with warm and rainy weather and high water levels, which peaked after a strong el niño event. | 2018 | 29260665 |
| helminth community from azara's grass mouse (akodon azarae) in three habitats with different land use in farming systems of argentina. | in the pampa region of argentina, farming activities have been performed since the beginning of the 20th century, but in the 1990s, land-use patterns rapidly changed towards intensive agriculture and poultry breeding. this study compares the helminth community of akodon azarae (rodentia) among three habitats with different land use in pampean agroecosystems: poultry farms, mono-cultivated fields and abandoned fields (not used for 35 years), under the prediction that there will be greater helmint ... | 2018 | 29386074 |
| seroprevalence of leptospiral antibodies in rodents from riverside communities of santa fe, argentina. | leptospirosis is a zoonotic disease that can be transmitted by contact with the urine of infected mammals. rodents play a mayor role in the transmission of leptospires to humans. the province of santa fe reports the greatest number of cases in argentina. yet, in this region, there are still knowledge gaps regarding the diversity of rodent species that may be hosts of pathogenic leptospires. the aims of this study were to evaluate the presence of leptospiral antibodies in rodents from three river ... | 2020 | 32330132 |
| home range variability, spatial aggregation, and excursions of akodon azarae and oligoryzomys flavescens in pampean agroecosystems. | rodents are reservoirs of various types of hantavirus, some of which are agents of hantavirus pulmonary syndrome in humans. each hantavirus is associated with a single rodent host species but successive spill-over events may eventually lead to host-switching and new species' becoming host of a given pathogen. this study aims to gain an understanding of the spatial ecology of two hantavirus-host species, akodon azarae, and oligoryzomys flavescens, by identifying factors modulating their home rang ... | 2020 | 32304184 |
| calodium hepaticum (trichuroidea: capillariidae) infection in akodon azarae: first description of histopathological lesions in sigmodontinae. | calodium hepaticum (trichinellida: capillaridae) is a parasitic nematode of mammals distributed worldwide. although this parasite can infect the liver of a wide diversity of mammals (including humans), it is mostly associated with muroidea hosts. sigmodontinae rodents were recently recognized as important hosts of this parasite in argentina, but the impact of this parasitism on these hosts has not been established. here we report results of histopathological analyses of 40 livers of akodon azara ... | 2019 | 30807714 |
| orthohantavirus genotype lechiguanas in oligoryzomys nigripes (rodentia: cricetidae): new evidence of host-switching. | to identify and predict situations of increased risk of orthohantavirus infection in humans, it is necessary to study the relationships between the virus and its rodent hosts. the present study investigated orthohantavirus infection in an assemblage of wild sigmodontinae rodents of the paraná delta, argentina, and providing new evidence of host-switching events. rodents belonging to the species oxymycterus rufus (n = 187), akodon azarae (n = 82), oligoryzomys flavescens (n = 80), oligoryzomys ni ... | 2019 | 30599176 |
| calodium hepaticum (nematoda: capillariidae) in wild rodent populations from argentina. | calodium hepaticum (nematoda; capillariidae) is a parasitic nematode of mammals with a cosmopolitan distribution. adults of this nematode can infect the liver of many mammalian species, including humans, but the main hosts are members of the superfamily muroidea. among these, rattus spp. have the highest apparent prevalences reported worldwide. there are only two reports of c. hepaticum infecting sigmodontinae species (muroidea: cricetidae). in this survey, we examined the occurrence of c. hepat ... | 2018 | 29951708 |
| small rodent species on pig and dairy farms: habitat selection and distribution. | rodent species are common in livestock production systems, and some of them are considered serious pests because of the sanitary problems and economic losses they cause. information about microhabitat selection by rodent species in livestock production systems is necessary for understanding rodent requirements and to contribute to effective prevention and development of control measures for pest rodent species. in this work we study microhabitat selection by rodent species that inhabit pig and d ... | 2019 | 30536608 |
| [first report on leptospira interrogans in the sigmodontine rodent scapteromys aquaticusprimeiro relato da presença de leptospira interrogans em roedores sigmodontíneos scapteromys aquaticus]. | leptospirosis is a globally distributed zoonosis that can be transmitted through direct or indirect contact with the urine or tissues of infected animals. in argentina, leptospirosis is endemic in the province of santa fe and epidemic outbreaks occur during floods. however, very little is known about the role that wild rodents play in the spread of the disease in argentina. the objective of this study was to identify the host species of pathogenic leptospira among rodents in a riverine settlemen ... | 2018 | 31093111 |
| use of an argentinean wildlife tissue collection for epidemiological studies of histoplasmosis. | histoplasmosis is a worldwide systemic endemic mycosis caused by several cryptic species included within the histoplasma capsulatum complex. domestic and wild mammals are susceptible to infection by this fungus and could be used as indicators of its presence in the environment. the aim of the study was to identify the natural reservoirs of h. capsulatum in the argentinean humid pampas eco-region analyzing a wildlife frozen-tissue collection and trace its distribution patterns over time and space ... | 2020 | 31993951 |
| new host species for leptospira borgpetersenii and leptospira interrogans serovar copenhageni. | we investigated the presence of infection by leptospira spp. in an assembly of sigmodontinae rodents from the paraná delta, argentina. rodents were captured in places with natural grassland, implanted forest, with and without raising cattle and in sites prone and not prone to flooding. the dna was amplified from cultured isolates by pcr and leptospira spp. strains were genotyped using multiple - locus variable number tandem repeat analysis (mlva). we isolated leptospira interrogans serovar copen ... | 2018 | 29426412 |