[Agglutinating antibodies against Listeria monocytogenes in healthy adult subjects].

The prevalence of antibodies to L. monocytogenes, type 1 and type 4b, in 334 healthy adults of Liguria land was determined by serological agglutination test. Agglutinins at low titer to L. monocytogenes are present in 22.45% of cases; in 88% of these the titer is 1:40. On the whole, the incidence of antibodies to L. monocytogenes type 1 increases with age and is higher (53.33%) than to 4b (22.66%). The incidence of agglutinins to O-antigens of L. monocytogenes is higher than to H-antigens.