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Science 8 May 2009:
Vol. 324. no. 5928, pp. 700 - 702
DOI: 10.1126/science.324_700
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News of the Week

Swine Flu Outbreak:

Out of Mexico? Scientists Ponder Swine Flu's Origins

Jon Cohen

The origin of the virus behind the current swine flu outbreak, its muscle power, and how much of a threat it presents remain mysteries. After Mexico, the United States has had the most cases, which on 5 May totaled 403. The almost simultaneous confirmations of the outbreak in both Mexico and the United States initially added further confusion to the outbreak's origins. But the virus itself has helped clear up some matters. The greatest concern is what will this confusing virus, which combines genes from swine, avian, and human influenza strains, do next?

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Science. ISSN 0036-8075 (print), 1095-9203 (online)