Influenza activity in the United States continues to decline
(Figure 3). Almost all influenza virus isolates this season have
been
type B (76.1%) or type A(H3N2) (23.8%). However, from February 17
to
February 24, type A(H1N1) viruses were isolated from three persons,
aged 3, 4, and 31 years, with influenza-like illness who lived in
the
same neighborhood in west Houston, Texas. Despite continued
surveillance, no further type A(H1N1) isolates have been identified
in
Houston. In Hawaii, one type A(H1N1) virus isolate was reported
this
season.
In Birmingham, Alabama, recent laboratory results have shown
that
an outbreak of influenza among college students reportedly caused
by
influenza type A(H3N2) virus (1) was primarily associated with type
B
influenza virus.
Reported by Influenza Research Center, Baylor College of Medicine,
Houston, Texas; State and Territorial Epidemiologists; State
Laboratory Directors; Statistical Svcs Br, Div of Surveillance and
Epidemiologic Studies, Epidemiology Program Office, WHO
Collaborating
Center for Influenza, Influenza Br, Div of Viral Diseases, Center
for
Infectious Diseases, CDC.
Reference
CDC. Update: influenza activity--United States. MMWR
1986;35:135-6, 141.
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