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Source
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Throat washings from an influenza patient
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References
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Burnet FM. A genetic approach to variation in influenza viruses; the characters of three substrains of influenza virus A (WS). J. Gen. Microbiol. 5: 46-53, 1951. PubMed: 14824469
Smith W. . Lancet 2: 66, 1933.
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