| waterborne giardiasis: a communitywide outbreak of disease and a high rate of asymptomatic infection. | a communitywide outbreak of gastrointestinal illness due to giardia lamblia infection occurred in the city of berlin, new hampshire, during april and may 1977. the clinical, epidemiologic, and laboratory aspects of this outbreak are described here. in 213 predominantly symptomatic cases of g. lamblia infection diagnosed at a local hospital laboratory in a 6-week period, illness was characterized by prolonged diarrhea (median duration 10 days) and 13% of symptomatic infections required hospitaliz ... | 1980 | 7424899 |