<p><span style=color: rgba(23 43 77 1)>This Special Issue includes all research aspects of avian virus research including the molecular virology viral immunology viral pathogenesis epidemiology antivirals novel vaccines and applications of avian viral vectors established by various international expert research groups in order to advance the global understanding of avian pathogens. This Special Issue provides an exceptional example that will lead to more excellent studies in the future.</span></p>