精选优质文档-倾情为你奉上The outbreak of swine flu that was first detected in Mexico was declared a global epidemic on June 11, 2009. It is the first worldwide epidemic_1_ by the World Health Organization in 41 years. The heightened alert _2_an emergency meeting with flu experts in Geneva that convened after a sharp rise in cases in Australia, and rising_3_in Britain, Japan, Chile and elsewhere.But the epidemic is _4_ in severity, according to Margaret Chan, the
