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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 92, No. 1, 1997, pp. 47-51
Bioline Code: oc97010
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 92, No. 1, 1997, pp. 47-51

 en Description of the occurrence of canine Dirofilariasis in the State of Rio de Janeiro, Brazil
Norma Labarthe; Nadia Almosny; Jorge Guerrero & Ana Maria Duque-Araujo


In order to evaluate the prevalence of canine heartworm in the State of
Rio de Janeiro, a multicenter survey was carried out in two phases. The
survey involved 1376 dogs from two cities: Rio de Janeiro and
Niteroi, and its surroundings, including the eastern shore and 
mountain resorts, which were further divided into sections. In the first
phase, 795 dog blood samples were examined by the modified Knott test for
the detection of microfilariae. A total of 134 samples (16.85%) were
microfilaremic: 8.61% from Rio de Janeiro, 21.76% from Niteroi and
its surroundings, 33.33% from the eastern shore and 30.43% from the
mountain resorts. In the second phase, 595 dog blood samples were examined 
first by the modified Knott test and the amicrofilaremic samples were
subsequently examined by an immunoenzymatic test (ELISA) for antigen
detection. In summary, 83 samples (13.95%) were microfilaremic and 44
(7.98%) of the amicrofilaremic samples were positive for heartworm antigen
(occult infections). In Rio de Janeiro, 13.68% of the dogs were infected
(i.e., antigen-and/or microfilaria-positive) and 8.51% of the dogs had 
microfilaremic infections. In comparison, Niteroi and its surroundings 
showed values of 24.46% and 17.30% and the eastern shore showed values of 
52.46% and 31.15%. In contrast the mountain resorts showed 20% 
microfilaremic only.

Dirofilaria immitis - dirofilariasis - heartworm - canine

© Copyright 1997 Fundacao Oswaldo Cruz
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