News of the WeekSwine Flu Outbreak

Out of Mexico? Scientists Ponder Swine Flu's Origins

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Science  08 May 2009:
Vol. 324, Issue 5928, pp. 700-702
DOI: 10.1126/science.324_700

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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?