ERVW-1 and infection: Notably, there was evidence of escape from only 6/15 of the T cell responses directed to epitopes in Gag and Pol, the mean entropy of which was 0.26nats, in the two recipients, whereas 10/10 of the T cell responses directed against epitopes in Env and other viral proteins, the average entropy of which was 0.89nats, showed evidence of escape by 1 year post-infection.