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Fig. 5 | BMC Veterinary Research

Fig. 5

From: Continuing evolution of H6N2 influenza a virus in South African chickens and the implications for diagnosis and control

Fig. 5

Maximum likelihood phylogenetic tree of segment 2 encoding the polymerase B1 (PB1) and PB1-F2 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, B and C

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