Although influenza type A(H3N2) virus isolates from 42 states
have
accounted for more than 90% of influenza isolates reported to CDC
this
season (1), in recent weeks, influenza type A(H1N1) virus has been
reported from 20 states (Figure 1). Influenza type B has now been
reported from 12 states (California, Kansas, Kentucky, Maine,
Minnesota, Nebraska, New York, Ohio, Pennsylvania, South Dakota,
Texas, and Wisconsin).
Influenza morbidity reports collected weekly from each state
continue to indicate a decline in activity. For the week ending
March
25, 1983, three states (Iowa, Nebraska, and Kentucky) reported
widespread activity, and seven states reported regional 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
eleventh
consecutive week. The observed ratio was 5.2, and the expected
ratio
was 4.1
Reported by Respective state epidemiologists and laboratory
directors;
Div of Surveillance and Epidemiologic Studies, Epidemiology Program
Office, Epidemic Investigations Br, Hospital Infections Program,
Statistical Svcs Activity, WHO Collaborating Center for Influenza,
Influenza Br, Div of Viral Diseases, Center for Infectious
Diseases,
CDC.
Reference
CDC. Update: Influenza activity--United States. MMWR
1983;32(11):146-7.
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