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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
CDC. Influenza Update--United States. MMWR 1982;3l1:160.
CDC. Antigenic analysis of recent influenza isolates. MMWR
1982;31:110-1.
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