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In the Influenza Surveillance Report No. 76 (April 12, 1963) it was observed that the
age-specific attack rates of influenza have not been constant from epidemic to
epidemic. This has further been shown to be true for relative age-specific pneumonia-
influenza excess morta1ity1. In 1957-58, peak attack rates and relative excess
deaths were noted in the age group 10-19.
In 1962-63, by contrast, these peaks were not observed, and the age-specific rates
were relatively flat. In 1968-69, a study of the age-specific attack rates was repeated
in Kansas City, Kansas, using the same techniques which had been used in the
same area in 1957. In contrast to the 1957-58 experience, in 1968-69 the age-specific
attack rates were relatively flat. The two above reports on age-specific attack rates from other
locations (Helena, Montan~and Baltimore, Maryland) tend to confirm this result.
lSerfling, Robert E., Ida L. Sherman, and William J. Houseworth; Excess Pneumonia-
Influenza Mortality by Age and Sex in Three Major Influenza A2 EpidemiCS, United
States, 1957-58, 1960 and 1963.
American Journal of Epidemiology, Volume 86,
No.2, pages 433-441, 1967.
[CDC, Influenza Surveillance Report No. 85 , June,30,1969]
[however, later it was shown that there were an age.shift
at age ~75 years in 1968/9 in USA and -clearer- in 1969/1970
in Europe resulting from an assumed protection
from H3 in 1889-~1895
---------------see also the Japan thread------------------
age-specific attack rates of influenza have not been constant from epidemic to
epidemic. This has further been shown to be true for relative age-specific pneumonia-
influenza excess morta1ity1. In 1957-58, peak attack rates and relative excess
deaths were noted in the age group 10-19.
In 1962-63, by contrast, these peaks were not observed, and the age-specific rates
were relatively flat. In 1968-69, a study of the age-specific attack rates was repeated
in Kansas City, Kansas, using the same techniques which had been used in the
same area in 1957. In contrast to the 1957-58 experience, in 1968-69 the age-specific
attack rates were relatively flat. The two above reports on age-specific attack rates from other
locations (Helena, Montan~and Baltimore, Maryland) tend to confirm this result.
lSerfling, Robert E., Ida L. Sherman, and William J. Houseworth; Excess Pneumonia-
Influenza Mortality by Age and Sex in Three Major Influenza A2 EpidemiCS, United
States, 1957-58, 1960 and 1963.
American Journal of Epidemiology, Volume 86,
No.2, pages 433-441, 1967.
[CDC, Influenza Surveillance Report No. 85 , June,30,1969]
[however, later it was shown that there were an age.shift
at age ~75 years in 1968/9 in USA and -clearer- in 1969/1970
in Europe resulting from an assumed protection
from H3 in 1889-~1895
---------------see also the Japan thread------------------
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