“…Although systemic vaccination protocols lack sufficient efficacy at present for use against mucosal HSV-2 infections in humans, several in vivo and in vitro studies indicate that immunity to or recovery from primary systemic infection by HSV-2 is mediated by humoral and cellular effector mechanisms. The roles of antibodies (Balachandran et al, 1982a;Morahan et al, 1977;Simmons & Nash, 1985), complement (Shore et al, 1979), interferon (Engler et al, 1981;Fitzgerald & Lopez, 1982), macrophages (Morahan et al, 1980;Plaeger-Marshall et al, 1983), cytotoxic T cells (CTLs) (Larsen et al, 1983;Rosenthal et al, 1987;Sethi et al, 1983), natural killer cells (Engler et al, 1981;Fitzgerald & Lopez, 1982), and cells involved in delayed hypersensitivity reactions (Nash & Ashford, 1982;Nash & Gell, 1983;Nash et al, 1981) and regulatory activities (Leung et al, 1984;Nash & Ashford, 1982) have all been implicated in resistance to systemic HSV-2 infection.…”