arbovirus investigations in argentina, 1977-1980. ii. arthropod collections and virus isolations from argentine mosquitoes.prospective surveys for arboviruses were carried out in santa fe, corrientes, and chaco provinces, argentina, aperiodically during 1977-1980. a total of 313,233 mosquitoes and 598 biting flies other than mosquitoes were collected and tested for virus in 5,197 and 45 pools, respectively. forty virus strains were isolated, all from mosquitoes, as follows: santa fe province: 4 gamboa group viruses from aedeomyia squamipennis, 1 strain each of st. louis encephalitis virus from culex pipiens quinquef ...19852863989
cocirculation of rio negro virus (rnv) and pixuna virus (pixv) in tucumán province, argentina.venezuelan equine encephalitis complex includes viruses considered emerging pathogens for humans and animals in the americas. two members of this complex have been detected previously in argentina: rio negro virus (rnv), detected in mosquitoes from chaco province and rodents from formosa province, and pixuna virus (pixv), detected in mosquitoes from chaco province. to carry out surveillance studies in other parts of the country, detection of a 195-bp fragment of alphaviruses by rt-nested pcr was ...201020497404
arbovirus investigations in argentina, 1977-1980. iv. serologic surveys and sentinel equine program.serologic surveys of wild and domestic birds, wild mammals, and horses were conducted during arbovirus field studies in argentina from 1977 through 1980, a non-epizootic interval. the prevalence of neutralizing antibodies to eastern equine encephalitis (eee) was consistently higher than to western equine encephalitis (wee) virus in all species and all areas. the presence of antibodies in short-lived avian species and in young unvaccinated horses and the demonstration of seroconversions in horses ...19852863991
arbovirus investigations in argentina, 1977-1980. iii. identification and characterization of viruses isolated, including new subtypes of western and venezuelan equine encephalitis viruses and four new bunyaviruses (las maloyas, resistencia, barranqueras, and antequera).forty viruses isolated from mosquitoes between 1977 and 1980 in argentina have been identified and characterized. nineteen strains of vee virus, identical by neutralization (n) tests, were shown by hemagglutination-inhibition tests with anti-e2 glycoprotein sera to represent a new subtype vi of the vee complex. rna oligonucleotide fingerprints of this virus were distinct from subtype i viruses. the virus was not lethal for english short-haired guinea pigs, indicating that it is probably not equi ...19852863990
enzootic activity of pixuna and rio negro viruses (venezuelan equine encephalitis complex) in a neotropical region of argentina.venezuelan equine encephalitis complex viruses cause epidemics and epizootics periodically in some regions of the americas. in argentina, only enzootic rio negro virus (ag80-663) (rnv) has been isolated. to survey and identify activity of viruses that belong to venezuelan equine encephalitis complex in a template region of the country, a generic alphavirus rt-nested pcr was performed in 99 mosquito pools collected in chaco province. five pools were positive, and amplicons were sequenced: four of ...201019402767
[existence of an edemic focus of rhinosporidiosis in the province of chaco. v. report of new cases and final considerations]. 196414244849
monoclonal antibody characterization of rabies virus strains isolated in the river plate this study, 91 strains isolated in the river plate basin, south america, were examined from the epidemiological standpoint and with monoclonal antibodies (mabs) to the nucleocapsid of rabies virus. such strains reacted to mabs in accordance with nine different patterns (antigenic variants). rabies virus was isolated from 49 cattle, 21 dogs, 11 non-haematophagous bats, four vampire bats, two foxes, two horses, one buffalo, and one human. five of the variants had not been described previously. ...19979394612
[complement-fixing antibodies against venezuelan equine encephalitis virus in the populations of corrientes and chaco, argentina]. 19836672936
arbovirus investigations in argentina, 1977-1980. i. historical aspects and description of study sites.this is the introductory paper to a series on the ecology of arboviruses in argentina. epizootics of equine encephalitis have occurred since at least 1908, principally in the pampa and espinal biogeographic zones, with significant economic losses; human cases of encephalitis have been rare or absent. both western equine and eastern equine encephalitis viruses have been isolated from horses during these epizootics, but the mosquitoes responsible for transmission have not been identified. a number ...19854037184
babesia equi field isolates cultured from horse blood using a microcentrifuge method.babesia equi, a causative agent of equine piroplasmosis, was isolated from horses in the chaco province of argentina, a known piroplasmosis endemic region. fifteen b. equi field isolates were acquired by culture from 23 actively working horses from 2 ranches. the horses appeared healthy with no clinical signs or histories indicative of equine piroplasmosis. all 23 horses had b. equi-specific antibody activity by the indirect fluorescent antibody test and 18 were also complement fixation test pos ...19989714196
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