With the death toll climbing, Mexican authorities at the center of an international swine flu epidemic struggled Monday to piece together its lethal march, with attention focusing on a 4-year-old boy and a pig farm.
The boy, who survived the illness, has emerged as Mexico's earliest known case of the never-before-seen virus, Health Secretary Jose Angel Cordova said Monday. It provides an important clue to the unique strain's path.
Meanwhile, the borders control are being tightened worldwide.
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