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[1st register of an epidemic caused by oropouche virus in the states of maranhão and goiás, brazil].the authors describe the occurrence of outbreaks caused by oropouche virus (oro) in the states of maranhão and goiás, brazil in 1988. 36 strains of the virus were obtained from the intracerebral inoculation of the blood of 120 patients into 2-3 day-old infant mice. the illness was characterized by headache, fever, pain in the muscles, joints and back, photophobia, retrobulbar pain, nausea and dizziness. 128 of 197 people examined in porto franco, ma, had hemagglutination-inhibiting antibodies to ...19892516642
transmission of oropouche virus from man to hamster by the midge culicoides paraensis.oropouche virus (arbovirus family bunyaviridae, simbu serological group) was experimentally transmitted from man to hamster by the bite of the midge culicoides paraensis. infection rates and transmission rates were determined after the midge had engorged on patients with viremia. the threshold titer necessary to enable infection or transmission by the midges was approximately 5.3 log10 of the median lethal dose of the virus in suckling mice per milliliter of blood. transmission was achieved 6 to ...19826800036
oropouche virus. ii. epidemiological observations during an epidemic in santarém, pará, brazil in 1975.an epidemic of oropouche fever occurred in santarém, pará, brazil in 1975. in the first survey for oropouche antibodies involving a random sample of an entire city, infection rates varied from 0-44%, depending on the specific area within the city. women had higher infection rates than men, but this difference was statistically significant only for persons older than 10 years of age. an analysis of school data showed that pupils in the evening classes had a greater increase in absenteeism during ...19817212162
oropouche virus. iii. entomological observations from three epidemics in pará, brazil, 1975.urban epidemics of oropouche (oro) fever in three municipalities in pará, brazil were studied in 1975. culicoides paraensis (goeldi) were collected during each of the epidemics and there was a positive correlation, by study areas within the city of santarém, between human seropositivity to oro virus and population densities of c. paraensis and culex quinquefasciatus say. the best numerical correlation was with populations of c. paraensis. the relative absence of other species in the areas of hig ...19817212163
oropouche virus. iv. laboratory transmission by culicoides paraensis.biological transmission of oropouche (oro) virus by culicoides paraensis (goeldi) has been successfully demonstrated in the laboratory. adult culicoides, collected in an area where oro virus was absent, were infected by feeding on viremic hamsters and then periodically exposed to susceptible hamsters at specific intervals post-infectious blood meal. these c. paraensis were capable of biological transmission of the virus 4-9 days post-feeding on viremic hamsters circulating 6.7-9.9 log10smld50/ml ...19817212164
biting rates and developmental substrates for biting midges (diptera: ceratopogonidae) in iquitos, peru.biting midges (diptera: ceratopogonidae) were collected at 16 periurban and rural sites around iquitos, peru, between 17 october 1996 and 26 may 1997. culicoides paraensis (goeldi), the principal vector of oropouche virus, was the most commonly collected species (9,086 flies) with culicoides insinuatus wirth & blanton second (7,229 flies). although both species were collected at all sampling sites (linear (distance surveyed approximately 25 km), c. paraensis dominated at northern collection site ...200314765657
changes in relative species compositions of biting midges (diptera: ceratopogonidae) and an outbreak of oropouche virus in iquitos, peru.species compositions of culicoides paraensis (goeldi) (diptera: ceratopogonidae), the major vector of oropouche virus to humans in central and south american urban cycles, and culicoides insinuatus ortiz & leon differed along a northeast-to-southwest transect across iquitos, department of loreto, peru. the relative distributions of the species were consistent with patterns of human outbreaks along the amazon river. we resumed collection of biting midges between may 2000 and january 2004 at three ...200516119543
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