In vitro garlic extracts excites the rat and human lymphocytes. A protein fraction (F4), isolated from aged garlic extract, boost the cytotoxicity of human peripheral blood lymphocytes against natural killer-sensitive and resistant cell lines and induced lymphocyte infiltration and cytokine release [74, 75]. Diallyltrisulfide and protein fraction, the components of garlic has been shown to enhance activation of T lymphocytes [76, 77] and also progresses the ratio of helper to suppressor T cell in AIDS. It also enhances antibody production against Salmonella enteritidis, Pasteurella multocida and Leptospira Pomona bacteria [78], which indicate that it increase the activity of B lymphocytes. Alliums at low levels in the diet improved the humoral immune response against Brucella abortus (non-replicating T-cell independent antigen) in chickens