File:Pertussis by Age.jpg

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Summary

Trends in pertussis cases over the last century from National Notifiable Diseases Surveillance System (NNDSS) reports 1922-2011.

This is a document of the United States Government and is therefore public domain.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	02:35, 2 November 2012		700 × 525 (234 KB)	Peter.tissell (talk \| contribs)	Trends in pertussis cases over the last century from National Notifiable Diseases Surveillance System (NNDSS) reports 1922-2011.

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Software used	Adobe Photoshop CS5 Windows