Rates of Pneumonia During Influenza Epidemics in Seattle, 1964 to 1975

Hjordis M. Foy, MD, PhD; Marion K. Cooney, PhD; Inez Allan, RN; George E. Kenny, PhD
JAMA. 1979;241(3):253-258. doi:10.1001/jama.1979.03290290021018.
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Influenza A epidemics were associated with a doubling to tripling of pneumonia rates among adult members of a prepaid medical care group studied between 1963 and 1975. Rates of influenza A associated with pneumonia increased with age. Influenza B epidemics did not have a similar effect. Overall pneumonia rates were highest in children younger than 5 years, but in this age group, other respiratory viruses dominated as causative agents. Influenza A and B epidemics were not always synchronized with those reported for the United States, and rates of influenza A infection varied between urban and suburban areas in sequential epidemics. In 1974, a year practically free from influenza A, a prolonged Mycoplasma pneumoniae epidemic kept rates of pneumonia high, especially during the summer.

(JAMA 241:253-258, 1979)


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