Spotted fever group rickettsia in small rodents from areas of low endemicity for brazilian spotted fever in the eastern region of Minas Gerais state, Brazil.
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2013
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We investigated the humoral immune response against different species of Rickettsia in serum samples
from small rodents collected in two areas of a silent focus for Brazilian spotted fever in the eastern region of Minas
Gerais State, Brazil. Sera samples were analyzed by indirect immunofluorescence assay using antigens from Rickettsia
species of the spotted fever, ancestral, and transition groups. Titers ³ 1:64 were considered positive. In Santa Cruz do
Escalvado, 94% (30 of 32) of the samples collected from Rattus rattus, 22% (5 of 23) from Nectomys squamipes, and 80%
(4 of 5) from Akodon sp., reacted by indirect immunofluorescence assay with Rickettsia antigens of the spotted fever
group. In the municipality of Pingo D’A´ gua, 84% (26 of 31) of the samples collected from R. rattus, 86% (6 of 7) of the
samples from Oryzomys subflavus, 86% (6 of 7) from N. squamipes, and 100% (1 of 1) from Bolomys sp. contained
antibodies that reacted with rickettsial antigens of the spotted fever group. These results demonstrated the previous
exposure of small rodents to spotted fever group Rickettsia, suggesting the participation of these animals in the natural
history of these rickettsiae in this region.
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MILAGRES, B. S. et al. Spotted fever group rickettsia in small rodents from areas of low endemicity for brazilian spotted fever in the eastern region of Minas Gerais state, Brazil. The American Journal of Tropical Medicine and Hygiene, v. 88, p. 937-939, 2013. Disponível em: <http://www.ajtmh.org/content/88/5/937.long>. Acesso em: 29 jan. 2017.