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CASES

LEGIONELLOSIS

Reported sporadic cases by month of onset, United States,

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Sporadic legionellosis continues to exhibit seasonality, with 51% of all reported cases for 1979-1980 having had onset in July-October. Approximately, the same number of cases were reported for 1978 and 1979; the decrease in cases in 1980 is probably due in large part to delayed reporting. Sporadic legionellosis continues to be diagnosed more frequently in men (68% of cases in 1980) and among those in the 50-69-year age range (55% of cases in 1980). The case-fatality ratio for 1980 was 16%. The only recognized outbreaks of legionellosis in 1980 occurred in a San Francisco hotel (February-March, 6 cases) and at the University Medical Center in Burlington, Vermont.

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The reported cases of leprosy continue to increase, but this represents an increase in imported cases rather than indigenous transmission.

CASES

LEPTOSPIROSIS

Reported cases by 5-year periods, United States, 1955-1980

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1955-'59 '60-'64 '65-'69 '70-'74 '75-'79 '80-'84

*85 CASES FOR 1980.

Less than 100 cases of leptospirosis are reported annually (1964 and 1978 excepted). Because leptospirosis has few distinctive clinical features, many more cases than those reported probably occur each year.

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