• Kyodo News

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People in their 60s and over are relatively immune to swine flu because it is similar to H1N1 viruses that circulated before 1943, a group of researchers said Friday.

The group, comprising Japanese, U.S. and Dutch researchers, including Hiroshi Nishiura from the Japan Science and Technology Agency, came up with the finding by comparing the gene sequence of the novel virus’ hemagglutinin — a protein related to immune reaction in humans — with those of H1N1 viruses from 1918 to the present.

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