Current Trends Update: Influenza Activity -- United States
Influenza virus isolates reported to CDC this season now total
1,249, including 1,116 type A(H3N2) isolates, 96 type A(H1N1), and
37
type B.
Influenza morbidity reports collected weekly from each state
continue to suggest a gradual decline in activity. For the week
ending April 2, 1983, six states (Kentucky, Missouri, Nebraska,
North
Dakota, Pennsylvania, and Tennessee), reported regional activity,
and
no states reported widespread activity. For the same week, an
excess
in the ratio of pneumonia and influenza (P&I) deaths to total
deaths
was reported from 121 cities for the twelfth consecutive week. The
observed ratio was 5.0, and the expected ratio was 4.0 (Figure 1).
Reported by Respective state epidemiologists and laboratory
directors;
Div of Surveillance and Epidemiologic Studies, Epidemiology Program
Office, Statistical Svcs Activity, WHO Collaborating Center for
Influenza, Influenza Br, Div of Viral Diseases, Center for
Infectious
Diseases, CDC.
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