Fig. 4. Antigenic cartography of the detected H9N2 viruses in Iraq and their relationship with contemporary H9N2 viruses isolated from Egypt and Lebanon. The maps were generated by using Antigen Map (http://sysbio.cvm.msstate.edu/AntigenMap) using HI data. One unit (grid) represents a twofold change in the HI assay results. (HK): Hong Kong.
