“…Lesiinski) In the immunofluorescence test, apart from the antibodies directed specifically against pathogenic T. pallidum, antibodies directed against the protein antigen group common to pathogenic spirochaetes, both saprophytic and cultivated, are also detected Fribourg-Blanc andNeil, 1966, 1967;Poetschke and Killisch, 1959;Covert, Kent, and Stevens, 1961;Kiraly, 1966aKiraly, , 1966b. The second type of antibody is an immunological response to spirochaetes saprophytizing on the mucous membranes of man.…”