Isolamento di Yersinia spp. da latte crudo e formaggi della Campania

- «Isolates of Yersinia spp. from raw milk and cheese in Campania». The Authors carried out a survey in order to define the epidemiology of Yersinia in Campania. 160 samples of raw milk and 81 samples of cheese were cultured. 34 (14.1%) Yersinia strains were isolated by a cold enrichment procedure: 27 (79%) from raw milk and 7 (21%) from cheese. Of the 27 strains isolated from raw milk, 25 (18.2%) were found in 137 samples of raw bovine milk and 2 (11.1%) in 18 samples of raw ovine milk. Yersinia spp. was not recovered from raw buffalo milk. The predominant isolates were of Yersinia enterocolitica not belonging to patogenous serotypes. Of the 7 strains isolated from cheese, 2 (13.3%) were recovered from 15 samples of green cheese, 4 (11.4%) from 35 samples of soft cheese and 1 (6.2%) from 16 samples of seasoned cheese. Yersinia spp. was not recovered from erborinated cheese. The most frequent strains belonged to Yersinia frederìksenii. Although Yersinia spp. is so often found, raw milk and cheese are not to be considered important in the transmission of the human infection