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28 Jan 2008 description

Excludes viruses detected from environmental surveillance and vaccine derived polio viruses.

08 Jan 2008 description

Note: Excludes viruses detected from environmental surveillance and vaccine derived polio viruses.

01 Jan 2008 description

Note: Excludes viruses detected from environmental surveillance and vaccine derived polio viruses.

11 Dec 2007 description

Excludes viruses detected from environmental surveillance and vaccine derived polio viruses.

04 Dec 2007 description

Excludes viruses detected from environmental surveillance and vaccine derived polio viruses.

27 Nov 2007 description

Excludes viruses detected from environmental surveillance and vaccine derived polio viruses.