The pattern of antibody detection against various retroviruses (Simian T lymphotropic virus, Simian retrovirus types one and five, Simian foamy virus), herpes viruses (Herpes B virus, Cytomegalovirus, Lymphocryptovirus, Rhesus rhadinovirus), and paramyxoviruses (Measles virus) did not reveal any correlation between previous viral infections and the presence of SERV-K1-specific immune responses (Fig. 5a). Here, KRT1 is linked to viral infectious disease.