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Japanese researchers: Blood may transmit H1N1 17.3.10 In a letter to the journal Emerging Infectious Diseases, the blood service of the Japanese Red Cross Society has expressed concern that blood transfusion may transmit pandemic H1N1 flu. Forty out of 96 people who gave blood last fall were diagnosed with H1N1 within 2 days of donation. Testing of retained segments did not reveal H1N1 nucleic acids; the researchers say flu viremia may be too brief to be detectable.