Swine Flu (cont.)
IN THIS ARTICLE
The results of ongoing investigations may answer several key questions about current swine flu viruses and how strains appear and then seem to disappear. So far, the H1N1 virus has not changed much since it first appeared in 2009. The newer vaccine seems effective against the virus and H3N2. Each year has brought new information to researchers and that information is used to help design new vaccines.
Medically Reviewed by a Doctor on 9/25/2013
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