Influenza isolates reported to CDC this season have increased
from
707 two weeks ago (1) to 971 (Figure 2). Seventeen states now
report
influenza type A(H1N1) virus activity, although most isolates (91%)
continue to be identified as type A(H3N2) related to the
A/Bangkok/79
component of the current vaccine. Influenza type A(H3N2) virus
isolates have been reported from 42 states. An influenza B isolate
was recently reported from Minnesota, raising to seven the number
of
states with influenza B activity.
Influenza morbidity reports collected weekly from each state
suggest a gradual decline in activity. Since the week ending
February
19, states reporting regional activity have decreased from 15 to
seven, coincident with an increase in states reporting sporadic
activity, 21 to 33. For the week ending March 19, 1983, four
states
(Iowa, Kentucky, Nebraska, and Virginia) reported widespread
activity. For that same week, an excess in the ratio of pneumonia
and
influenza (P&I) deaths to total deaths was reported from 121 cities
for the 10th consecutive week (Figure 2). The observed ratio was
5.1,
and the expected ratio was 4.1.
Reported by 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.
Reference
CDC. Update: influenza activity--United States. MMWR
1983;32:120-1.
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