Influenza pandemic AH1N1v/2009--early experience and autumn perspectives.

摘要

Between end of March and early April 2009, a novel influenza A H1N1 virus of swine origin spread in Mexico and in the United States of America [1]. Within a few weeks, the virus was circulating throughout the world (118 Countries by 29th June). Since its transmission is direct from man to man, the WHO raised a pandemic alarm, initially at level 4 and, soon after, at levels 5 and 6(11.6.2009). This virus has the potential to cause the first influenza pandemic of the XXIst Century. The first few months of observation and research have highlighted some important points, especially concerning the agent at work and its origin.