The occurrence of Listeria in faeces was investigated in 107 samples of per sons with enteric disturbance. For enrichment, Tryptose Phosphate broth was used and incubated at 4°C for 4 weeks. Subsequent at the cold-enrichment, the cultures were streaked on plates of four selective media: Tryptose agar with 5 mcg/ml of polymyxin B; Tryptose agar with 50 mcg/ml of nalidixic acid; Trypaflavin-Nalidixic acid, described by Ralovich and a modification introduced in the last medium (Tryptose agar containing 40 mcg/ml of nalidixc acid, 50 mcg/ml of tallous acetate and 25 mcg/ml of trypaflavin). ldentification of suspected colonies was read under a scanning microscope using the oblique light technique according to Henry (14). In three of these faecal specimens, Listeria was isolated: two strains belonged to serotype 4b against only one to type 1/2a.