A new flu virus emerges the h1n1pdm09 virus was very different from h1n1 viruses that were circulating at the time of the pandemic. The h1n1 virus is a strain of influenza a that causes respiratory infection. Influenza a viruses are classified based on the two important proteins located on the surface of the virus. Because this virus is very different from current seasonal influenza viruses, many people will not have protective immunity against it and the seasonal flu vaccine will not protect against it either. We have determined that this virus is contagious and is spreading from human to human. However, at this time, we have not determined how easily the virus spreads between people.
In april 2009, who convened a group of experts to develop the initial guidance for clinicians on the management of human disease caused by the new influenza a h1n1 virus. A influenza a, ou nova gripe, e uma doenca respiratoria causada pelo virus influenza a, subtipo h1n1. Ah1n1 virus swine flu influenza ah1n1 ah1n1 pandemic. Cdc is working with local and state health agencies to investigate these cases. Entradas sobre virus ah1n1 escritas por pedroantoniodelvalle. The figure in annex three shows a timeline for event management in this initial phase. Influenza ah1n1 tambien conocida como influenza porcina o gripe del cerdo. Influenza is unpredictable, but this flu season could be worse than recent years because of the 2009 h1n1 virus.