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MEASLES (Rubeola) Distribution and mean annual incidence of reported cases by age group, four reporting areas,' 1960-1964, 1976-1980, 1981-1984

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'New York City, District of Columbia, Illinois, and Massachusetts. * Yearly average for each interval. SThese selected data accurately reflect incidence rates using total U.S. data. The age distribution of total U.S. cases differed in that 31.7% of patients were < 5 years old and 20.8% of patients were 10-14 years old. 1980 population data were used.

MENINGOCOCCAL INFECTIONS — Rates, by year, United States, 1930-1984

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In 1984, 2,746 cases of meningoccal infection were reported in the United States. The case rate of 1.2 cases/100,000 population was identical to the rate for 1983. Age-specific attack rates peaked at 17.1 cases/100,000 among infants under 1 year of age and declined to 5.2 cases/100,000 among children 1-4 years of age. Approximately 50% of reported cases affected children under 5 years of age. The peak of reported cases occurred in late winter and early spring. Only six cases were reported among members of the military service.

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In 1984, a total of 3,021 cases of mumps were reported to CDC from 45 states. The incidence of 1.3 cases/100,000 population was the lowest reported since mumps became a nationally notifiable disease in 1968. This figure is 10% lower than the 1983 total of 3,355 cases and represents a 98% decrease from the total in 1968, the year after licensure of mumps vaccine. Twenty-five states reported fewer cases of mumps in 1984 than in 1983. The number of counties reporting cases of mumps decreased slightly between 1983 (726, 23.1%) and 1984 (700, 22.3%). Further declines in the incidence of reported mumps can be expected as more children entering school are required to provide proof of immunity to mumps.

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*Rates were calculated by multiplying the percentage of cases with known age group by total reported cases and dividing by the population in the age group.

Age-specific data were available for 2,654 (88%) of the cases reported for 1984. As in 1982 and 1983, approximately three-fourths of mumps patients of known age reported in 1984 were under 15 years of age. Children 5-9 years of age had the highest incidence (5.9/100,000 population) in 1984. Persons 10-14 years of age had the next highest incidence of disease. Together, children 5-14 years of age accounted for 61% of all cases with known age. Although the reported incidence rose 4% for persons 10-14 years of age and remained stable for persons 15-19 years of age, other age groups reported declines of 16%-18% compared with 1983.

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MUMPS Age distribution and incidence of reported mumps cases, United States, 1982-1984

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Grand total 5,270 100.0

2.3
3,355 100.0 1.4 3,021 100.0 1.3

-43 *Reported number of cases per 100,000 population, extrapolated from the age distribution of cases with known age.

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