CD8A and infection: Similarly, in MERS-CoV infection, the seroconversion process is observed during 15–21 days after infection (6), however, it has been reported that this antibody response is not likely to be correlated with the viral clearance (7, 8). Regarding the T cell response, a dominant Th1 response has been described during SARS-CoV infection (9), whereas in MERS-CoV infection the early increase of CD8+ T cells correlates with disease severity and a dominant Th1 response is observed in the early convalescent stages (10).