Update: Influenza Virus Activity -- United States, Canada
United States: Through January 28, 1983, 33 states in all
areas
of the country have reported influenza virus isolations from
residents
(Figure 3). Almost all isolates have been type A(H3N2) virus,
related
to the A/Bangkok/l/79 component of currently available vaccine.
Type
A(H1N1) virus was identified from sporadic cases in two
locations--Chicago, Illinois, and San Bernadino, California. Type
B
influenza virus has been identified from sporadic cases in Houston,
Texas, and Canton, Ohio.
For the third consecutive week this season, deaths attributed
to
pneumonia and influenza (P & I) were elevated in 121 U.S. cities
for
the week ending January 28. The ratio of P & I deaths to total
deaths
was 5.2, compared with 4.9 the previous week.
Canada: Influenza cases have now been reported by most
provinces. Laboratory-confirmed influenza A/Bangkok activity has
been
reported by British Columbia, Alberta, Saskatchewan, Manitoba,
Ontario, Quebec, New Brunswick, Labrador, and Northwest
Territories.
As of January 7, 1983, 133 isolates and 91 seroconversions of
influenza A/Bangkok-like (H3N2) had been reported by the provinces.
By contrast, as of January 7, 1982, one isolate and seven
seroconversions of influenza type A virus--some Bangkok-like and
others Brazil-like--had been reported.
Reported by J Baxa, Ohio State Dept of Health; L Blouse, MD, U.S.
School Aerospace Medicine, San Antonio, Texas; Respective State
Epidemiologists and Laboratory Directors; Canada Diseases Weekly
Report, January 15, 1983;9:3; Communicable Disease Div, Bureau of
Epidemiology, Laboratory Centre for Disease Control, Ottawa,
Ontario,
Canada; Consolidated Surveillance Activity, Epidemiology Program
Office, WHO Collaborating Center for Influenza, Influenza Br,
Statistics Br, Div of Viral Diseases, Center for Infectious
Diseases,
CDC.
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