Laboratory investigations of virus isolation and serum antibodies in a Mediterranean country (Italy) demonstrated that influenza A and B viruses, and often both, circulated every winter in Italy.
The winter 1987/88 was characterized by a low level of influenza activity, as shown by the limited number (47) of influenza virus isolates, the majority of which (61%) belonged to the influenza B type.
In contrast, the 1988/89 influenza season was exclusively associated with the circulation of influenza type A viruses.
The A(H1H1) subtype was largely predominant (97%), as compared to the low incidence of the A(H3N2) subtype (3%). During the 1989/90 winter a cocirculation of A and B influenza viruses was observed, A(H3N2) strains being responsible for 96% of the virologically confirmed cases.
Mots-clés Pascal : Influenzavirus A, Influenzavirus, Orthomyxoviridae, Virus, Influenzavirus B, Grippe, Virose, Infection, Epidémiologie, Surveillance, Sérologie, Antigénicité, Immunité humorale, Homme, Italie, Europe
Mots-clés Pascal anglais : Influenzavirus A, Influenzavirus, Orthomyxoviridae, Virus, Influenzavirus B, Influenza, Viral disease, Infection, Epidemiology, Surveillance, Serology, Antigenicity, Humoral immunity, Human, Italy, Europe
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 93-0540015
Code Inist : 002B05C02C. Création : 199406.