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Influenza surveillance report no. 90, 1973-1974 and 1974-1975
  • Published Date:
    Issued February 1976
Filetype[PDF-3.79 MB]

  • Corporate Authors:
    Center for Disease Control, Respiratory and Special Pathogens Branch. ; Center for Disease Control, Laboratory Branch., Respiratory Virology Unit. ; United States, Public Health Service., Office of the Surgeon General., Advisory Committee on Immunization Practice. ; ... More ▼
  • Description:
    I. Summary -- II. Surveillance methods -- III. Surveillance results, 1973-1974 -- IV. Surveillance results, 1974-1975 -- V. Method for diagnosis of influenza outbreaks -- VI. ACIP recommendations, June 1975

    "1973-1974 (September 1973 through August 1974): ln the 1973-1974 season, epidemics of influenza B occurred throughout central and eastern United States in January and February. Numerous reports of morbidity due to influenza B were received, and deaths due to pneumonia and influenza hovered at the epidemic threshold from January through April. Influenza B strains isolated in the 1973-1974 season were similar to B/Hong Kong/5/72, B/Victoria/98926/70, and strains intermediate between the 2. In March and April, a localized outbreak of influenza A in the middle Atlantic states was reported. For 7 weeks pneumonia and influenza mortality exceeded the epidemic threshold for this area. All influenza A isolates were similar to A/Port Chalmers/l/73. Smaller degrees of excess mortality occurred in the West North Central, East North Central, New England, East South Central, and the West South Central states: however, this excess mortality was not conclusively related to influenza. 1974-1975 (September 1974 through August 1975): From November 1974 through April 1975, influenza reached epidemic proportions in all regions of the United States except the East North Central states. The first confirmed outbreaks were reported in Hawaii in early November. By late December all of the South Atlantic and East South Central states were involved. Subsequent reports indicated that influenza had spread to the West and Northeastern regions of the United States. By March 1975, reports of outbreaks had decreased markedly. Based an excess pneumonia and influenza deaths which occurred in 121 cities, an extrapolation showed that in the entire United States approximately 4,800 such deaths occurred in the 1974-1975 season. The South Atlantic, East South Central, and West North Central states were the areas with the most influenza morbidity and mortality. All virus isolates examined at the World Health Organization (WHO) Collaborating Center for Influenza, Center for Disease Control (CDC), were closely related to A/Port Chalmers/l/73 by the hemagglutination inhibition test." p. [1]

    Section VI, ACIP recommendations, June 1975, also has title: Recommendation of the Public Health Service Advisory Committee on Immunization Practices: Influenza vaccine (June 1975; Published MMWR: Vol. 24. No. 23. 1975).

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