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temporary removal: homologous and heterologous antigenic matched vaccines containing different h5 hemagglutinins provide variable protection of chickens from the 2014 u.s. h5n8 and h5n2 clade highly pathogenic avian influenza viruses.the publisher regrets that this article has been temporarily removed. a replacement will appear as soon as possible in which the reason for the removal of the article will be specified, or the article will be reinstated. the full elsevier policy on article withdrawal can be found at
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