WhoLab18.GIF


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Summary

Description
English: Influenza positive tests reported to CDC by US WHO/NREVSS collaborating laboratories, national summary, 2008-2009 season week 18: subtypes and percent positive tests. The strain responsible for the 2009 novel H1N1 outbreak is shown.
Date
Source Centers for Disease Control and Prevention (CDC)
Author CDC Influenza Division

Licensing

Public domain
This image is a work of the Centers for Disease Control and Prevention , part of the United States Department of Health and Human Services , taken or made as part of an employee's official duties. As a work of the U.S. federal government , the image is in the public domain .

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15 May 2009