Influenza surveillance report no. 71, March 22, 1962
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Influenza surveillance report no. 71, March 22, 1962

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  • English

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      "Reports of isolated outbreaks in Maine, Vermont, and Canada have been received. Although not identified virologically undoubtedly represent the northward extension of Influenza B. New confirmations of Influenza B have been reported from Arkansas and Kentucky. The total number of States confirming Influenza B this season is 38. Several cases of encephalitis, possibly secondary to influenza, are reported from North Carolina end Washington. Definitive proof of the etiologic relationship is lacking. A 70 percent protection ratio for polyvalent influenza vaccine was obtained in a study of tuberculosis patients in Seattle, Washington. Those who accepted vaccine preceding the outbreak of Influenza B had a lower attack rate than those who did not. The population immunized in Washington State between July and December 1960 was estimated by questionnaire survey. The same study was repeated for 1961. Results indicate that the immunized population doubled. However, the high risk groups (those over 65 years of age, the chronically ill, and pregnant women) received no more vaccine, proportionately, than the others. Six hundred and twenty-eight pneumonia and influenza deaths were reported by the 108 cities during the week ending March 17. The rise was due mainly to increases above epidemic thresholds in the New England end East North Central States." - p. [1]
    • Content Notes:
      March 22, 1962.

      Produced by the Communicable Disease Center Epidemiology Branch Influenza Surveillance Unit.

      "Summarized in this report is information received from State Health Departments, university investigators, virology laboratories and other pertinent sources, domestic and foreign. Much of the information is preliminary. It is intended primarily for the use of those with responsibility for disease control activities. Anyone desiring to quote this report should contact the original investigator for confirmation and interpretation." - preface

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