To cite this article: Shahid, M.F., Yaqub, T., Tipu, M.Y., Aslam, A., Yaqub, S., Rahman, A. and Ali, M. 2019. Comparative pathogenic potential of avian influenza A/H9N2 viruses isolated from commercial, backyard and fancy birds. Punjab Univ. J. Zool., 34(2): 143-148. https://dx.doi.org/10.17582/journal.pujz/2019.34.2.143.148