Regional Transmission and Reassortment of 2.3.4.4b Highly Pathogenic Avian Influenza (HPAI) Viruses in Bulgarian Poultry 2017/18. - Venkatesh, Divya; Brouwer, Adam; Goujgoulova, Gabriela; Ellis, Richard; Seekings, James; Brown, Ian H.; Lewis, Nicola S. (Viruses (1999-4915), 2020)