“…Furthermore, in experimental models of this complex disorder, the generation of autoantibodies (Ohashi et al, 1985) and autoreactive T cells to (Tsubata et al, 1996), and the deposition of IgG, IgA, and complement in ductal epithelial cells of (deLuise et al, 1982), lacrimal tissue may accompany the striking glandular inflammation (Jabs et al, 1985;Jabs and Prendergast, 1988;Tsubata et al, 1996;Takahashi et al, 1996;Robinson et al, 1998;van Blokland and Versnel, 2002). The etiology of Sjögren's syndrome may involve the endocrine system (Ansar et al, 1985;Talal and Ahmed, 1985;Nelson and Steinberg, 1987;Ahmed et al, 1989;Homo-Delarche et al, 1991;Homo-Delarche and Durant, 1994;Sullivan, 1994Sullivan, , 1997, but it may also be due to primary infection by, and reactivation of, EpsteinBarr virus, cytomegalovirus, herpes virus-6, hepatitis C, or retroviruses (Burns, 1983;Fox, 1988;Green et al, 1989;Krueger et al, 1990;Mariette et al, 1991Mariette et al, , 1993Fox et al, 1991;Pflugfelder et al, 1993;Pepose et al, 1996;Sipsas et al, 2011). These viruses have been identified in the lacrimal and/or salivary tissues of Sjögren's patients (Burns, 1983;Fox et al, 1986;Fox, 1988;Krueger et al, 1990;Garry et al, 1990;Mariette et al, 1991;Pflugfelder et al, 1993;Tsubota ...…”