“…Transferred antigens stimulate the production of speci®c antibodies which is, however, strictly controlled in healthy subjects (Challacombe & Tomasi, 1980). Appearance of IgE is known to correlate with hypersensitivity reactions but the clinical relevance of IgG, IgA and IgM isotypes produced in response to dietary antigens is obscure (Bruijnzeel-Koomen et al, 1995). Most recently published papers suggest that IgG and IgA may have a role in hypersensitivity reactions (Keller et al, 1996;Marinkovich, 1996;Wutrich, 1996;Awazuhara et al, 1997;Duchen et al, 1997;Kolopp-Sarda et al, 1997;Shimojo et al, 1997;Spuergin et al, 1997).…”