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Giardiasis surveillance--United States, 2003-2005
Jonathan S Yoder1, Michael J Beach,
1Division of Parasitic Diseases, National Center for Zoonotic, Vector-Borne, and Enteric Diseases, CDC, Atlanta, GA 30333, USA. jey9@cdc.gov
Morbidity and Mortality Weekly Report. Surveillance Summaries (Washington, D.C. : 2002)
|September 7, 2007
Summary
Giardiasis, a gastrointestinal illness, is transmitted across the U.S. with higher incidence in northern states and a peak during summer recreational seasons. Surveillance data informs public health efforts to control this parasitic infection.
Area of Science:
- Infectious Diseases
- Parasitology
- Public Health Surveillance
Background:
- Giardiasis is a gastrointestinal illness caused by the protozoan parasite Giardia intestinalis.
- Understanding the epidemiology of giardiasis is crucial for effective public health interventions.
Purpose of the Study:
- To analyze national surveillance data for giardiasis in the United States.
- To identify geographic, demographic, and seasonal patterns of giardiasis incidence.
Main Methods:
- Utilized data from the CDC's National Notifiable Disease Surveillance System (NNDSS).
- Analyzed voluntarily reported cases from state, commonwealth, territorial, and metropolitan health departments.
- Reporting period covered 2003–2005.
Main Results:
- Reported giardiasis cases remained stable from 2003 to 2005.
- Incidence was highest in northern states, with a notable increase in areas reporting high case counts.
- Peak illness onset occurred during summer and early fall, particularly affecting children aged 1-9 and adults aged 30-39.
Conclusions:
- Giardiasis transmission is widespread in the U.S., with regional variations in reporting.
- The summer seasonal peak suggests a link to recreational water activities.
- Surveillance data are vital for public health education, prevention strategies, and research prioritization for giardiasis.
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