a longitudinal study of junin virus activity in the rodent reservoir of argentine hemorrhagic fever.we monitored junin virus (jv) activity in rodent populations for 30 months at seven mark-recapture grids located in agricultural fields and adjacent roadsides and fence lines in endemic and nonendemic areas of argentine hemorrhagic fever. blood and oral swabs taken from rodents captured at five-week intervals were analyzed by enzyme-linked immunosorbent assay for jv antigen (ag). calomys laucha and c. musculinus were the most frequently captured rodents, making up 47% and 22% of captures, respec ...19921335214
microgeographic distribution of allele frequencies in populations of calomys laucha (rodentia, cricetidae).the microgeographic differentiation of allelic frequencies was analysed in two population samples of calomys laucha, collected in a grid set in cultivated fields at laguna larga (córdoba province, argentina). one of the samples (n = 79) was obtained in may (autumn), when the population density is at a maximum, and the other (n = 85) in november (spring), at the onset of reproductive activity. fst values for the november sample show significant differences between the six groups over which the sa ...19911880049
heterozygosity and gene flow in populations of calomys laucha (rodentia, cricetidae).enzyme polymorphism was studied by means of starch gel electrophoresis on five population samples of calomys laucha collected in different sites and seasons. c. laucha, a cricetid rodent inhabiting preferentially cultivated fields in the central-eastern plains of argentina, is a reservoir-host of junin virus, agent of argentine hemorrhagic fever. results show high levels of genic variability in all the samples (p from 62.50 to 77.27; h from 0.118 to 0.163) and low genetic distance among populati ...19902194995
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 ...19882841151
evaluation of an enzyme-linked immunosorbent assay for detection of antibodies to junin virus in rodents.junin virus is the etiological agent of argentine hemorrhagic fever, a serious rodent-borne disease. an enzyme-linked immunosorbent assay (elisa) to detect junin virus igg antibodies in rodents was evaluated using sera from 27 calomys musculinus and five calomys laucha, inoculated experimentally with a live attenuated strain of this arenavirus. the test performance was compared against an indirect immunofluorescence assay (ifa). the elisa had a sensitivity and specificity of 100% and a reproduci ...200211906733
arenaviruses.the arenaviridae family contains 22 recognized virus species, each of them strongly associated with a rodent species (except tacaribe virus which is associated with a species of bat), suggesting an ancient co-evolutionary process. although the concept of co-evolution between rodents and arenaviruses is now largely accepted, little has been uncovered in terms of dating the phenomenon and the mechanisms of evolution, including speciation and pathogenicity. these questions are targeted in the prese ...200717848068
host and viral traits predict zoonotic spillover from mammals.the majority of human emerging infectious diseases are zoonotic, with viruses that originate in wild mammals of particular concern (for example, hiv, ebola and sars). understanding patterns of viral diversity in wildlife and determinants of successful cross-species transmission, or spillover, are therefore key goals for pandemic surveillance programs. however, few analytical tools exist to identify which host species are likely to harbour the next human virus, or which viruses can cross species ...201728636590
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