[Eleven cases of co-infection with influenza type A and type B suspected by use of a rapid diagnostic kit and confirmed by RT-PCR and virus isolation].
Kansenshogaku Zasshi
; 79(11): 877-86, 2005 Nov.
Article
en Ja
| MEDLINE
| ID: mdl-16366359
ABSTRACT
In the 2004/05 influenza season there were epidemics of influenza caused by several types of viruses (type B and A (H3) viruses, and type B, A (H3), and A (H1) viruses) in many areas of Japan. In such epidemics a single individual could be co-infected with several influenza viruses. From February to March in 2005, we examined 15 patients who were positive for influenza type A and B viruses when tested with a rapid diagnostic kit. The type A (H3) and B influenza virus genes were successfully amplified by RT-PCR in 10 of the 15 patients, confirming that they were co-infected with type A (H3) and B viruses. The type A (H1) and B virus genes were successfully amplified in another patient, confirming that the patient was co-infected with type A (H1) and B viruses. By contrast, 2 patients were clearly positive for type A and B viruses according to the rapid diagnostic kit, but positive for type B virus alone by RT-PCR. No influenza virus genes were detected by RT-PCR in the remaining 2 patients. To isolate one type from a mixture of two different types of influenza viruses in a specimen, we neutralized one of the types with type-specific antiserum, and isolated the other with MDCK (+) cells. The results obtained by virus isolation were identical to those obtained by RT-PCR. Influenza viruses corresponding to the results of RT-PCR were isolated from 9 of the 11 patients in which isolation was attempted. No viruses were isolated from the 2 patients in whom no virus genes were detectable by RT-PCR. Based on these results we concluded that 11 of 15 patients who were positive for type A and B viruses according to the rapid diagnostic kit were co-infected with type A (H3) or A (H1) and B virus. When several types of influenza viruses are prevalent, as in the 2004/05 influenza season, the possibility of a patient being co-infected with more than one type of influenza virus should be considered.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Virus de la Influenza A
/
Virus de la Influenza B
/
Juego de Reactivos para Diagnóstico
/
Gripe Humana
Tipo de estudio:
Diagnostic_studies
Límite:
Child
/
Child, preschool
/
Female
/
Humans
/
Infant
/
Male
Idioma:
Ja
Revista:
Kansenshogaku Zasshi
Año:
2005
Tipo del documento:
Article