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In contrast, isogenic viruses expressing S proteins from African isolates were nearly fully virulent; other studies showed that West African camel isolates carry mutations in MERS-CoV accessory proteins, which may limit human transmission. These data indicate that following a single-point introduction of the virus, MERS-CoV S protein evolved rapidly in South Korea to adapt to human populations, with consequences on virulence. In contrast, the mutations in S proteins of African isolates did not change virulence, indicating that S protein v