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Ook h5n1?
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Virology. 2005 Oct 10;341(1):153-62.
Protective efficacy in chickens, geese and ducks of an H5N1-inactivated vaccine developed by reverse genetics.
he ideal seed virus for vaccine production is a strain of low pathogenicity that is well-matched antigenically with the prevailing virus and capable of growing well in eggs, which is crucial to mass production (Kilbourne, 1969 and Chen et al., 2003). All H5N1 viruses isolated in China since 1996 have multiple basic amino acids in the cleavage site of HA and therefore are all either highly pathogenic or potentially highly pathogenic avian influenza viruses unsuitable for vaccine production.