Mexico City closed schools across the metropolis of 20 million Friday after at least 16 people died and more than 900 others fall ill from what health officials suspect is a new strain of swine flu. World health officials worried that it could mark the start of a flu pandemic.
The World Health Organization in Geneva, Switzerland said at least 57 have died in the outbreak, although it wasn't yet clear if this larger number of deaths was due to swine flu.
"We are very, very concerned," said Thomas Abraham, a spokesman for the agency. "We have what appears to be a novel virus and it has spread from human to human." If international spread is confirmed, that meets WHO's criteria for raising the pandemic alert level, he added.
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