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Influenza Update -- United States ANTIGENIC ANALYSIS OF INFLUENZA A(H3N2) ISOLATES

Influenza A(H3N2) viruses isolated during early March 1982 in association with sporadic cases in Texas and Florida (1) have been shown by hemagglutination-inhibition tests to resemble most closely A/Bangkok/2/79. A previously unreported H3N2 isolate collected from Houston in January by the Influenza Research Center at Baylor University, as well as an isolate recovered in Spain during September 1981 from a US Air Force person with illness, have also been found to resemble A/Bangkok/2/79. Reported by WHO Collaborating Center for Influenza, Div of Viral Diseases, Center for Infectious Diseases, CDC.

Editorial Note

Editorial Note: A/Bangkok/2/79 was originally identified simultaneously with A/Bangkok/1/79, from which it shows recognizable antigenic variation (2). Since that time, A/Bangkok/2/79-like virus has been detected occasionally in parallel with other H3N2 variants, of which the majority have usually more closely resembled A/Bangkok/1/79. It is unusual to detect A/Bangkok/2/79-like strains in the absence of the other recent H3N2 variants. However, it would be premature, because of the small number of H3N2 isolates from the US population this year, and the presence of different variants in other populations, to attach predictive significance to the recent identification of sporadic A/Bangkok/2/79-like virus isolates from US citizens.

References

  1. CDC. Influenza Update--United States. MMWR 1982;3l1:160.

  2. CDC. Antigenic analysis of recent influenza isolates. MMWR 1982;31:110-1.

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