Analysis of the 1998 outbreak of leptospirosis in Missouri in humans exposed to infected swine.

Objective: To determine the extent of leptospirosis in persons exposed to infected swine, confirm the source of disease, define risk factors for infection, and identify means for preventing additional infections during an outbreak in Missouri in 1998.

Design: Cross-sectional study.

Sample Population: 240 people and 1,700 pigs.

A community waterborne outbreak of salmonellosis and the effectiveness of a boil water order.

Objectives: A 1993 large water-borne outbreak of Salmonella typhimurium infections in Gideon, Mo, a city of 1100 with an unchlorinated community water supply, was investigated to determine the source of contamination and the effectiveness of an order to boil water.

Methods: A survey of household members in Gideon and the surrounding township produced information on diarrheal illness, water consumption, and compliance with the boil water order.

Results: More than 650 persons were ill; 15 were hospitalized, and 7 died.