“…[4] and our own studies [ 14,20,23] have shown that, during remission, patients suffering from genital or labial herpes display, probably transiently, insufficient cell-mediated immunity (CMI) to HSV as assessed by the leucocyte migration test (LMT) [2,15,25]. The CMI response to HSV in these patients increases 6-8 days after a relapse, with a subsequent decrease over time [14,20]. Similarly, in a preliminary study whose results are reported hereafter, we have observed that patients suffering from relapsing herpes keratitis (RHK) have deficient CMI responses to HSV-I but also to CMV.…”