WHO : The first shot would be followed by a second shot three weeks later . Swine flu deaths up 338 in recent days to 500 in total worldwide . WHO : Virus spreads in 6 months as far as most viruses spread in 6 months . U.S. plans to vaccinate nearly 500 M Americans ahead of winter ` ` flu . '' WHO has signed deals to provide 10 million doses of vaccine this year .
WHO : Swine flu deaths up 338 in recent days to 500 in total worldwide . WHO : Virus spreads in 6 months as far as most viruses spread in 6 months . U.S. plans to vaccinate nearly 500 M Americans ahead of winter ` ` flu . '' WHO has signed deals to provide 10 million doses of vaccine this year .