Seasonal influenza is extremely contagious. It is transmitted from person to person through droplet infection. Flu viruses are always changing. A current vaccine is thus developed for each flu season. For this reason, the flu vaccination must be repeated...
Seasonal influenza is extremely contagious. It is transmitted from person to person through droplet infection. Flu viruses are always changing. A current vaccine is thus developed for each flu season. For this reason, the flu vaccination must be repeated annually in order to obtain reliable protection against illness. The vaccine for the current 2011 flu season also protects against infection with the New Flu A (H1N1) pathogen.
