Surveillance of influenza A and B viruses in Italy between 1984 and 1987

Mancini, G; Arangio-Ruiz, G; Campitelli, Laura; Castrucci, Maria Rita; Diana, Ledy; Donatelli, Isabella; Ruggieri, Anna

doi:10.1007/bf00146396

Cited by 5 publications

(3 citation statements)

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“…To check the immune level against the influenza A(H1N1) subtype we used the A/Taiwan/1/86 strain, which was not isolated during the winter 1987/88, but was the most prevailing virus during the previous influenza season (8). This influenza variant was selected as a vaccine component for the following winter 1988/89 (15).…”

Section: Antibody Surveysmentioning

confidence: 99%

“…As in previous winters (8), the antigenic characterization of the isolates has shown that influenza A and B viruses, and often both, circulate every winter. Their presence has usually been associated with antigenic variation of the surface antigens.…”

Section: The Pattern Of Antibody In the Sera Collected In The Summer mentioning

confidence: 99%

“…As for the influenza A(H3N2) subtype, a certain degree of antigenic heterogeneity among the circulating influenza A(H1N1) strains was detected. Nevertheless, the A/ Taiwan/1/86 variant, wich had emerged and predominated two years before (8) was still the most prevalent virus (68%). Immunity levels against this variant, which were detected in the sera collected in 1988 and 1989 post-epidemic periods, correlate with the above virological results.…”

Section: The Pattern Of Antibody In the Sera Collected In The Summer mentioning

confidence: 99%

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Concurrent antigenic analysis of recent epidemic influenza A and B viruses and quantitation of antibodies in population serosurveys in Italy

et al. 1993

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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 co-circulation of A and B influenza viruses was observed, A(H3N2) strains being responsible for 96% of the virologically confirmed cases. Antigenic analysis of the virus isolates showed some antigenic variation in influenza A viruses of both H1N1 and H3N2 subtypes, whilst antigenic stability was found among the influenza B virus isolates. Overall, the above virological findings correlate with the data concerning the pattern of influenza virus circulation in Northern Europe and the UK during the three years surveyed. The results of serum antibody surveys conducted in each post-epidemic period are also reported.

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Section: Antibody Surveysmentioning

confidence: 99%

Section: The Pattern Of Antibody In the Sera Collected In The Summer mentioning

confidence: 99%

Section: The Pattern Of Antibody In the Sera Collected In The Summer mentioning

confidence: 99%

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