The development of live attenuated cold-
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Hunein F. Maassab; Martin L. Bryant
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Article
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1999
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John Wiley and Sons
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English
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A procedure to attenuate live influenza virus of type A and type B was developed using adaptation of the virus to grow at 25 degrees C (cold adaptation; ca). Through a series of stepwise passages, two stable mutants were obtained and designated as 'Master' strains, one for type A influenza virus (A/