First flu pandemic in 41 yrs
In a letter sent to its member countries, the WHO said it is officially raising its infectious diseases alert to Phase 6, its highest level, in recognition of the fact that the virus is now undergoing communitywide transmission in Australia as well as in North America. Such spread in two distinct regions of the world is the primary criterion for raising the alert level.
via Swine flu pandemic declared by World Health Organization – Los Angeles Times.