Virological study of a dengue type 1 epidemic at Rio de Janeiro

Memórias do Instituto Oswaldo Cruz

Rita Maria R. Nogueira¹  Hermann G. Schatzmayr¹  Marize P. Miagostovich¹  Maria De Fátima D. B. Farias¹  José Da Costa Farias Filho¹ 

[1] ,Instituto Oswaldo Cruz Departamento de Virologia Rio de Janeiro,Brasil

关键词: dengue virus;    dengue epidemic;    flavivirus;    Rio de Janeiro;    virus dengue;    epidemia de dengue;    flavivírus;    Rio de Janeiro;   

DOI  :  10.1590/S0074-02761988000200012

来源: SciELO

【 摘 要 】

A dengue outbreak started in March, 1986 in Rio de Janeiro and spread very rapidly to other parts of the country. The great majority of cases presented classical dengue fever but there was one fatal case, confirmed by virus isolation. Dengue type 1 strains were isolated from patients and vectors (Aedes aegypti) in the area by cultivation in A. albopictus C6/36 cell line. The cytopathic effect (CPE) was studied by electron microscopy. An IgM capture test (MAC-ELISA) was applied with clear and reproducible results for diagnosis and evaluation of virus circulation; IgM antibodies appeared soon after start of clinical disease, and persisted for about 90 days in most patients. The test was type-specific in about 50% of the patients but high levels of heterologous response for type 3 were observed. An overall isolation rate of 46,8% (813 virus strains out of 1734 specimens) was recorded. The IgM test increased the number of confirmed cases to 58,2% (1479 out of 2451 suspected cases). The importance of laboratory diagnosis in all regions where the vectors are present is emphasized.

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