Incidence of Listeria monocytogenes in fresh foods in Barcelona (Spain).

From September 1989 to March 1990, a study of Listeria spp. was carried out on 311 samples of raw foodstuffs from markets and other establishments in the city of Barcelona. These foodstuffs included vegetables (103 samples), minced meats from pork, beef and poultry (168 samples) and bivalve molluscs (40 samples). L. monocytogenes was isolated in 7.8% of the vegetable samples, 17.3% of the minced meats and in 7.5% of bivalve molluscs. The most frequent serovars were 1/2 and 4. Other species isolated were L. innocua, L. welschimeri and L. seeligeri.