Prevalence of Listeria monocytogenes in Raw Milk in Guadalajara, Mexico.

The frequency of L. monocytogenes and other species of Listeria was determined in 100 samples of raw milk obtained from street vendors and retail stores located in the city of Guadalajara, Mexico. Listeria innocua and Listeria welshimeri were isolated from 7 and 2 samples, respectively, whereas L. monocytogenes was not isolated from any samples.