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5
Estimated number of cases based on reported number of
deaths during 1922-1926 assuming a case-fatality rate
of 90%.
6
Average
number of annual case in 1951-1954, 4 years before vaccince
licensure.
7
Average number of annual case in 1958-1962, 5 years
before vaccince licensure.
8
Number of reported cases in 1968, the first year of
reporting began adb the first year after vaccine licensure.
9
Average number of annual case in 1966-1968, 3 years
before vaccince licensure.
10
Estimated number of cases based on seroprevalence data
in the population and on the risk that women infected
during childbearing year would have a fetus with congenital
rubella syndrome.
11
Estiamted number of cases from population-based surveillance
studies before vaccine licensure in 1985.
12.
Excludes 194 cases of Haemophilus influenzae disease
of unknown serotype or not type b. Represents unvasive
diease in children younger than 5 years of age.
Source:MMWR.2000;48(RR-12):8.
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