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Cellular immunity to herpes simplex virus type 1 (HSV-1) in 12 volunteers with recurrent herpes labialis was evaluated by means of two microassays. In the blastogenesis assay, lymphocytes were incubated with tissue culture cells persistently infected with HSV-1. Uninfected cells were used as controls, and a blastogenic index was calculated. The mean blastogenic index (plus or minus SD) for subjects with recurrent herpes labialis was 26.9 (plus or minus 8.3); the mean blastogenic index (plus or minus SD) in control donors with antibody to HSV-1 was 13.4 (plus or minus 7.2). The difference between these values was statistically significant (t equals 4.154; P smaller than 0.001). In the cytotoxicity assay, cells of the same persistently infected line were used as target cells, and release of 51-Cr from these cells or from control cells served as the index of lymphocyte reactivity. Specific immune release attributable to HSV-1 averages 3.7% (plus or minus 1.8%) in subjects with recurrent herpes labialis, compared with 23.1% (plus or minus 9.8%) in controls (t equals 6.135; P smaller than 0.001). These data suggest a dissociation between mechanisms of cellular immunity, with enhanced lymphocyte blastogenesis but decreased cytotoxicity. Recurrent herpes labialis may thus result from subtle cellular immune deficiency involving at least one of the efferent mechanisms.
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Stomatologia mediterranea : SM,
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July 1981,
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September 1986,
Pediatric research,
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Infection and immunity,
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January 1983,
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December 1991,
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March 2007,
Current cancer drug targets,
