H1N1 Immunity in Groups?
329 views · Published 9 October 2009 · 1:47 · Indexed 20 September 2026
Channel: CBS News · 2009 · News & Politics
According to the CDC, New York and New Jersey were hard hit by the H1N1 virus in the spring but have fewer cases this fall. Dr. Jon LaPook explains a protective effect called "herd immunity."
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