uniogsduess Publicado 15 sep 2009, 14:08:41 Publicado 15 sep 2009, 14:08:41 Changes in the virus due to antigenic drift or antigenic shift mean that the vaccine must also change to cover the prevailing strains of the virus; last year's vaccine may not protect against this year's virus. If you have any of these symptoms it is important to drink plenty of fluids, as the increased body temperature will cause fluid loss due to dehydration.
Pepe.. Publicado 20 sep 2009, 01:52:18 Publicado 20 sep 2009, 01:52:18 Because of it in USA they are doing a new vaccine.
