Influenza type A(H3N2) virus related to Bangkok/79 has
accounted
for greater than 90% of all influenza isolates reported during the
1982-1983 season. In recent weeks, increased numbers of type
A(H1N1)
virus isolates, related to the Brazil component of the current
vaccine, have been identified; they have been reported in 11
states,
while type A(H3N2) isolates have been reported in 37 states.
Four states (Nebraska, Ohio, Oklahoma, and Texas) reported
widespread influenza activity for the week ending February 19.
Another 15 states (Colorado, Idaho, Illinois, Iowa, Kansas,
Kentucky,
Maine, Michigan, Missouri, Montana, Nevada, Tennessee, South
Dakota,
Virginia, and Wisconsin) reported outbreaks in one or more
locations.
For the week ending February 19, the observed ratio of pneumonia
and
influenza (P&I) deaths to total deaths was 5.2, and the expected
ratio
was 4.1. This is the sixth consecutive week that an excess in the
ratio of P&I deaths was recorded from the 121 reporting cities.
Reported by Respective state epidemiologists and laboratory
directors;
U.S. Air Force School of Aerospace Medicine; 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.
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