“…The absorption of endotoxins from the intestinal tract of mammals, both under physiological and pathological conditions, is a long-standing, but still current, problem. The majority of researchers could not demonstrate endotoxin absorption from the intestinal canal (2,3,7,10,13,17,24,31). However, as found by Rauss and co-workers (18-20), Ketyi (11), and Ocklitz and co-workers (15, 16), the perorally administered endotoxin, as an antigen, is able to produce a specific immunity.…”