Parainfluenza Types 1-3 National Trends
Weekly laboratory test result data are collected on a voluntary basis. Because there is often a delay in reporting for some laboratories, data collection is less complete for the more recent weeks shown. Data from July 2006 through June 2007 are complete. All national trends now display the weekly average.
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- Page last reviewed: September 5, 2008
- Page last updated: April 28, 2009
- Content source: National Center for Immunization and Respiratory Diseases, Division of Viral Diseases
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