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POPULATION ECOLOGY OF HANTAVIRUS RODENT HOSTS IN SOUTHERN BRAZIL
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Abstract. In this study we analyze population dynamics of hantavirus rodent hosts and prevalence of infection over a
2-year period in Southern Brazil, a region with a high incidence of hantavirus pulmonary syndrome. The 14 small mammal
species captured were composed of 10 rodents and four marsupials, the six most abundant species being Akodon serrensis,
Oxymycterus judex, Akodon montensis, Akodon paranaensis, Oligoryzomys nigripes, and Thaptomys nigrita. These species
displayed a similar pattern with increasing population sizes in fall/winter caused by recruitment and both, increase in
reproductive activity and higher hantavirus prevalence in spring/summer. Specific associations between A. montensis/
Jabora´ Virus (JABV) and O. nigripes/Juquitiba-like Virus (JUQV-like) and spillover infections between A. paranaensis/
JABV, A. serrensis/JABV, and A. paranaensis/JUQV-like were observed. Spillover infection in secondary hosts seems to
play an important role in maintaining JABV and JUQV-like in the hantavirus sylvatic cycle mainly during periods of low
prevalence in primary hosts.
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