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American Journal of Epidemiology Vol. 105, No. 4: 330-336
Copyright © 1977 by The Johns Hopkins University School of Hygiene and Public Health

other

GIARDIASIS IN COLORADO: AN EPIDEMIOLOGIC STUDY

RICHARD A. WRIGHT1,, HARRISON C. SPENCER2, RICHARD E. BRODSKY2 and THOMAS M. VERNON3

1Field Service Branch, Center for Disease Control Atlanta, GA
2Parasitic Disease Branch, Center for Disease Control Atlanta
3Colorado Department of Health Denver

Reprint requests to Dr. Wright, Denver Disease Control Service, 605 Bannock Street, Denver, CO 80204.

A one-year retrospective laboratory survey in Colorado revealed that 691 (3%) of 22, 743 stool examinations for ova and parasites were positive for Giardia lamblia, a higher percentage than that reported from surveys outside of Colorado. The majority of infected residents who were surveyed had experienced an episode of chronic watery diarrhea (median duration 3.8 weeks) with bloating, flatulence, and weight loss (averaging 5.1 kg), and had responded to a course of metronidazole or quinacrine. A statewide telephone survey of 256 cases and matched controls identified: 1) an increased incidence of giardiasis in persons between the ages of 16 and 45, p <.001, with males and females equally affected; and 2) a higher proportion of cases than controls who visited Colorado mountains (69% vs. 47%), camped out overnight (38% vs. 18%), and drank untreated mountain water (50% vs. 17%), p <.001. Also identified was a correlation between the seasonal distribution of cases and degree of fecal contamination of mountain streams. These results indicated that G. lamblia is endemic in Colorado and that drinking untreated mountain water is an important cause of endemic infection.

demography; diarrhea; epidemics; giardiasis; immunity; ovum; parasites; water pollution


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