The World Health Organization has raised its pandemic alert level in response to the outbreak of swine flu that originated in Mexico, U.S. Homeland Security Secretary Janet Napolitano said Monday.
The move from level three to level four on the WHO's six-level threat scale means the world body has determined the virus is capable of significant human-to-human transmission -- a major step toward a flu pandemic, said Dr. Keiji Fukuda, the agency's assistant director-general.
A pandemic is not considered "inevitable," Fukuda said. But Napolitano said the move "does indicate that we have a serious outbreak of swine flu on our hands."
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"Sadly, 149 people have died, of which we are working to confirm if they are linked to the swine flu," Mexico Health Secretary Jose Angel Cordova Villalobos said. "The number of cases, unfortunately, will continue to increase."
So far, 26 cases have been confirmed by laboratory tests in Mexico and reported to the World Health Organization. Nearly 2,000 people have been hospitalized and 776 remain in hospitals, Cordova said.