“…Many clinical and experimental animal model studies have been performed over the years using a variety of systems to document that ethanol or its metabolites impair white blood cell function and cause predisposition to infections (Cook, 1999; Jerrells et al., 1990, 1994; MacGregor and Louria, 1997; Szabo, 1999). A marked reduction in the number of circulating lymphocytes has been found in heavy drinkers without showing a similar effect for other white blood cell populations (Meadows et al., 1992; Myrthed et al., 1977;Tonnesen et al., 1990;Young et al., 1979) . Both in vitro and in vivo studies show that ethanol triggers apoptosis in both lymphocytes and monocytes (Ewald and Shao, 1993; Singhal et al., 1999).…”