| correlates of the peridomestic abundance of lutzomyia longipalpis (diptera: psychodidae) in amazonian brazil. | abundance of the sandfly lutzomyia longipalpis, the vector of leishmania chagasi, was surveyed using cdc light-suction traps in fifteen villages and 180 homesteads on marajó island, pará state, brazil. flies were most abundant in cultivated areas, secondary growth and open woodland, away from savanna grassland and forest. within homesteads, the abundance of flies in animal sheds was weakly associated with the number of hosts kept therein, and inversely related to the number elsewhere, both human ... | 1994 | 7949312 |
| molecular epidemiology of rabies from maranhão and surrounding states in the northeastern region of brazil. | although many outbreaks of rabies have been reported in northern brazil, few epidemiological studies of these outbreaks have been undertaken. in this study, molecular epidemiological analyses were performed using 41 rabies virus samples isolated in the maranhão (ma), pará (pa), and tocantins (to) states of northeastern brazil. a 599-bp region of the glycoprotein (g) gene was first amplified from each sample by rt-pcr, then sequenced and subjected to phylogenetic analysis. a phylogenetic tree div ... | 2006 | 16773238 |
| canine visceral leishmaniasis due to leishmania (l.) infantum chagasi in amazonian brazil: comparison of the parasite density from the skin, lymph node and visceral tissues between symptomatic and asymptomatic, seropositive dogs. | canine visceral leishmaniasis (cvl) is recognizable by characteristic signs of disease and is highly lethal. the infection, however, may be quite inapparent in some seropositive dogs, and this has raised the polemic question as to whether or not such animals can be a source of infection for lutzomyia longipalpis, the vector of american visceral leishmaniasis (avl). in this study we have examined 51 dogs with acute cvl from an avl area in pará state, northern brazil, and compared the parasite den ... | 2010 | 21049230 |
| a prospective study on the dynamics of the clinical and immunological evolution of human leishmania (l.) infantum chagasi infection in the brazilian amazon region. | this prospective study was carried out from october 2003 to december 2005 and involved a cohort of 946 individuals of both genders, aged 1-89 years, from an endemic area for american visceral leishmaniasis (avl), in pará state, brazil. the aim of the study was to analyze the dynamics of the clinical and immunological evolution of human leishmania (l.) infantum chagasi infection represented by the following clinical-immunological profiles: asymptomatic infection (ai); symptomatic infection (si=av ... | 2010 | 20538310 |
| occurrence of antibodies anti-neospora caninum, anti-toxoplasma gondii, and anti-leishmania chagasi in serum of dogs from pará state, amazon, brazil. | a cross-sectional study was conducted to determine the occurrence of anti-toxoplasma gondii, anti-neospora caninum, and anti- leishmania chagasi antibodies in dogs of the state of pará, brazil. for this purpose, 129 blood samples were collected from dogs of different ages and gender. samples of 72 dogs were collected from 39 rural properties from 19 municipalities, and 57 samples were from stray dogs, collected after captivity by the center of zoonosis control from the municipality of santarém. ... | 2010 | 20445991 |
| [focus of canine heartworm disease in marajó island, north of brazil: a risk factor for human health]. | the occurrence of human pulmonary dirofilariasis maintains a relation with the prevalence of dirofilaria immitis infection in the canine population. several mosquito species are vectors of this nematode. canine blood samples collected in pingo d'agua and união villages, salvaterra municipality (marajó island, pará), in june, 2004 (n = 34) and april, 2005 (n = 90) were analyzed. parasitological and immunological (elisa--kit snap(r) 3dx biobrasil) diagnoses were compared following the examination ... | 2006 | 17119746 |
| the epidemiology of canine leishmaniasis: transmission rates estimated from a cohort study in amazonian brazil. | we estimate the incidence rate, serological conversion rate and basic case reproduction number (r0) of leishmania infantum from a cohort study of 126 domestic dogs exposed to natural infection rates over 2 years on marajó island, pará state, brazil. the analysis includes new methods for (1) determining the number of seropositives in cross-sectional serological data, (2) identifying seroconversions in longitudinal studies, based on both the number of antibody units and their rate of change throug ... | 1997 | 10190170 |
| [direct agglutination tests in the serodiagnosis of visceral leishmaniasis in the state of pará]. | the direct agglutination test (dat) was evaluated for serodiagnosis of visceral leishmaniasis (vl) in human and canids (dogs and foxes cerdocyon thous). the results were compared with those of the immunofluorescent antibody assay (ifat) and enzyme-linked immunosorbent assay (elisa). the sera used were from: humans (303): confirmed vl (16), suspected vl (65), other conditions (102), negative controls (15) and individuals from an endemic area (105); dogs (82): from an endemic area (68), salvaterra ... | 1996 | 8713608 |
| leishmaniasis in brazil. xxi. visceral leishmaniasis in the amazon region and further observations on the role of lutzomyia longipalpis (lutz & neiva, 1912) as the vector. | further evidence is presented incriminating the sandfly lutzomyia longipalpis as the vector of leishmania chagasi, the causative agent of american visceral leishmaniasis, in the amazon region of brazil. during an outbreak of the disease in santarém, pará state, this insect was shown to be the only species of sandfly consistently present in and around the patient's homes, where it often occurred in very large numbers. of 491 specimens dissected, 35 (7.14%) proved to be infected, and isolates of l ... | 1985 | 4002291 |
| leishmaniasis in brazil. xxii: characterization of leishmania from man, dogs and the sandfly lutzomyia longipalpis (lutz & neiva, 1912) isolated during an outbreak of visceral leishmaniasis in santarém, pará state. | during epidemiological studies on an outbreak of visceral leishmaniasis in santarém, pará state, north brazil, isolates of leishmania from two children, three dogs and six naturally infected specimens of the sandfly lutzomyia longipalpis were compared, biochemically, by starch-gel enzyme electrophoresis. they have proved to be indistinguishable from each other, and from a reference strain of leishmania chagasi cunha & chagas, 1937 from a case of human visceral leishmaniasis from bahia state, nor ... | 1986 | 3726975 |
| [epidemiological characteristics of american cutaneous leishmaniasis in an endemic region of the state of bahia. iii. phlebotomine fauna]. | the phlebotomine fauna is highly varied in três braços, an endemic area of american cutaneous leishmaniasis, situated in the cacao growing region in the southeast of bahia state, brazil. thirty spécies of the lutzomyia genus were identified in 13,535 specimens collected between 1976 and 1984. lutzomyia whitmani was the dominant species accounting for 99% of flies in the peridomicile and 97.5% of those caught in homes. in the forest the predominant species were lu. ayrozai and lu. yuilli. lu. whi ... | 1986 | 3574127 |
| host preferences of the phlebotomine sandfly lutzomyia longipalpis in amazonian brazil. | experiments were undertaken to determine the relative attractiveness of humans, dogs and chickens to lutzomyia longipalpis, the principal vector of leishmania chagasi causing american visceral leishmaniasis. field experiments in two villages on marajó island, pará state, brazil, showed that one boy attracted significantly more flies than one dog or chicken, and slightly fewer flies than a group of six chickens. experiments with laboratory-bred female flies showed that a significantly greater num ... | 1992 | 1421498 |