The World Health Organization has decided to raise the swine flu pandemic alert level to phase 5.
Swine Influenza or swine flu, is caused by type A influenza which is endemic in pigs. This kind of virus does not regularly infect human beings but now it has.
Confirmed human cases of swine flu in the United States and Mexico have been reported and it is believed that those who are infected are spreading it to their families and close contacts.
Last Monday the alert level was raised to phase 4 but now WHO officials say that they would be raising it to level 5 soon.
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