The current threat (the Mexican Swine Flu) stems from a human flu virus, not from a swine flu virus. It is a human flu virus mingled with swine flu and probably also with bird flu virus variants. The scientific nick name of the dangerous virus family is A/H1N1.
The virus spreads like any ordinary flu virus very easily among humans. It spreads through the air and keeps sticking on surfaces for several days. You might inhale it simply by breathing, or you might incorporate it some time after touching a surface with the contagious virus on it.
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