The spread of swine flu in Russia in 2520 and flu are caused by viruses H 1 N 1 worldwide have increased levels of surveillance since the outbreak of SARS in Southeast Asia. (Caused by a corona virus SARS) level of alertness has also increased, and respond to outbreaks of "bird flu" or influenza type A, H 5 N 1 as a species whose death rate is high, but the species is. the rate of spread from person to person, or low prevalence rate in the world.
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