WASHINGTON (Reuters) - Influenza viruses coat themselves in fatty material that hardens and protects them in colder temperatures -- a finding that could explain why winter is the flu season, U.S. researchers reported on Sunday.
WASHINGTON (Reuters) - Influenza viruses coat themselves in fatty material that hardens and protects them in colder temperatures -- a finding that could explain why winter is the flu season, U.S. researchers reported on Sunday.
