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Giardiasis surveillance -- United States, 2011-2012
MMWR Supplements
|May 1, 2015
Summary
Giardiasis case rates decreased in 2011-2012, possibly due to changing transmission or surveillance. Young children and Northwest states showed higher incidence, highlighting the need for continued public health efforts.
Area of Science:
- Public Health
- Infectious Diseases
- Epidemiology
Background:
- Giardiasis, caused by Giardia intestinalis, is a nationally notifiable gastrointestinal illness.
- Surveillance data from the National Notifiable Diseases Surveillance System (NNDSS) is crucial for tracking giardiasis trends.
Purpose of the Study:
- To analyze national giardiasis surveillance data for the years 2011-2012.
- To identify trends, incidence rates, and demographic patterns of reported giardiasis cases.
Main Methods:
- Analysis of voluntarily reported giardiasis cases from 44 states, DC, NYC, Puerto Rico, and Guam.
- Calculation of incidence rates per 100,000 population for 2011 and 2012.
- Examination of age, geographic, and outbreak-associated case data.
Main Results:
- A total of 16,868 cases in 2011 and 15,223 in 2012 were reported, with incidence rates of 6.4 and 5.8 per 100,000, respectively.
- This marked a decline from previous years (2005-2010).
- Cases were most common in children aged 1-4 years, with highest incidence in Northwest states and peaks in summer/fall.
Conclusions:
- Giardiasis rates showed a potential decrease for the first time since 2002.
- Geographic and age-specific variations suggest differences in transmission or surveillance.
- Public health education and improved reporting are vital for reducing giardiasis and understanding its epidemiology.
