Fig. 6.
Maximum likelihood phylogenetic tree of segment 3 encoding the polymerase A (PA) and PA-X proteins of South African H6N2 chicken and reference viruses. Green = Gauteng Province; Blue = North West Province; Red = KwaZulu-Natal Province; clear = reference strains. Viruses sequenced in the present study are in boldface. Genetic clusters are labelled A and B and