“…It appears these genotypes were introduced into different parts of the world and have undergone purifying selection independently but in parallel, resulting in geographic clusters or lineages and have been named based on their original geographic locations at time of discovery. These lineages include America-1 (contains almost all commercially available vaccine strains), America-2, America-3, South America/North America-4, America-5, Canada-1, Canada-1, Asia-1, Asia-2, Asia-3, Asia-4, Asia-5, Asia-6, Caspian, Europe/South America-1, South America-2, South America-3, Europe Wildlife, Arctic-like, Rockborn-like (vaccine strain), Africa-1, Africa-2, and Australia [ 32 , 40 , 41 , 42 ].…”