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abstractpubmed· Abstract 2019· item PMID:30561309

Avian Influenza A(H9N2) Virus in Poultry Worker, Pakistan, 2015. Avian influenza A(H9N2) virus isolated from a poultry worker in Pakistan in 2015 was closely related to viruses detected in poultry farms. Observed mutations in the hemagglutinin related to receptor-binding affinity and antigenicity could affect cross-reactivity with prepandemic H9N2 vaccine strains.