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Scientists say a virus is a factor in cyclical mass die-offs of Eider ducks in the Cape Cod area since 1998
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CIDRAP NEWS SCAN: Waning pertussis immunity, new virus in ducks
Source: http://www.cidrap.umn.edu/cidrap/con...2newsscan.html
NEWS SCAN: Waning pertussis immunity, new virus in ducks
Mar 19, 2012
Study: Pertussis immunity not long-lived in vaccinated...