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Update: Influenza Activity -- United States, Worldwide
United States: Morbidity reports collected weekly by each
state
indicate a continuing decline in influenza outbreaks. For the week
ending April 9, 1983, 2 states (Kentucky and New Mexico) reported
regional activity, and no state reported widespread activity. In
recent weeks, reports of influenza virus isolations from
collaborating
laboratories have also indicated a decline in influenza activity
(Figure 2). Most isolates (89%) continue to be type A(H3N2) virus,
despite increases in influenza B and type A(H1N1). For the week
ending April 9, 1983, an excess in the ratio of pneumonia and
influenza (P&I) deaths to total deaths was reported from 121 cities
for the thirteenth consecutive week. The observed ratio was 5.2 and
the expected ratio was 4.1 (Figure 2).
Worldwide: Influenza activity during the 1982-1983 season has
generally been moderate and largely associated with influenza type
A(H3N2) viruses, which have been reported from all five continents
since October 1982. A(H3N2) has been the type most frequently
isolated in all areas of the world and has been associated with
outbreaks in all age groups. Influenza type A(H1N1) isolates have
been associated with sporadic cases and with outbreaks among
schoolchildren. Influenza type B isolates, generally associated
with
sporadic cases, have been identified in several European countries.
During late March and early April, influenza activity appeared to
be
declining in most European countries.
Reported by WHO Weekly Epidemiologic Record, 1983;58(1-13);
Respective
state epidemiologists and laboratory directors; 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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