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H9N2 avian influenza viruses cause worldwide infections in animals including humans and show a threat as a pandemic infection. Since 1998 more than 59 cases including one death due to H9N2 infection had been reported worldwide and the majority of confirmed cases were young children. Due to the large host variety, tolerance to both poultry and mammals and widespread gene reassortment, H9N2 viruses played a crucial role in worldwide infection. In this review, we discuss the current worldwide infection of H9N2 avian influenza viruses as well as their host range, pathogenesis, epidemiology, diagnosis, control, and its pandemic potential.
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Kamthania et al. (2018) studied this question.
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