<P> The 2009 flu pandemic vaccines are the set of influenza vaccines that have been developed to protect against the pandemic H1N1 / 09 virus . These vaccines either contain inactivated ( killed ) influenza virus , or weakened live virus that can not cause influenza . The killed vaccine is injected , while the live vaccine is given as an interperineal nasal spray . Both these types of vaccine are usually produced by growing the virus in chicken eggs . Around three billion doses will be produced annually , with delivery from November 2009 . </P>
<P> The 2009 flu pandemic vaccines are the set of influenza vaccines that have been developed to protect against the pandemic H1N1 / 09 virus . These vaccines either contain inactivated ( killed ) influenza virus , or weakened live virus that can not cause influenza . The killed vaccine is injected , while the live vaccine is given as an interperineal nasal spray . Both these types of vaccine are usually produced by growing the virus in chicken eggs . Around three billion doses will be produced annually , with delivery from November 2009 . </P>
when did the swine flu vaccine come out
when did the swine flu vaccine come out
November 2009
November 2009