Giardiasis Surveillance --- United States, 2006--2008

Giardiasis Surveillance — United States, 2006–2008


During 2006–2008, the total number of reported cases of confirmed giardiasis increased slightly from 19,239 for 2006 to 19,794 for 2007 and decreased slightly to 19,140 for 2008. A greater number of case reports were received for children aged 1–9 years and for adults aged 35–44 years compared with other age groups. Incidence of giardiasis was highest in northern states. Peak onset of illness occurred annually during early summer through early fall. The seasonal peak in age-specific case reports coincides with the summer recreational water season and likely reflects increased outdoor activities and exposures such as camping and use of communal swimming venues (e.g., lakes, rivers, swimming pools, and water parks) by young children


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Giardiasis Surveillance --- United States, 2006--2008