Prevalence, characterization and sources of Listeria monocytogenes in blue crab (Callinectus sapidus) meat and blue crab processing plants

► Two percent of samples were positive for Listeria monocytogenes. ► Ninety-seven percent of the isolates were resistant to at least one antibiotic. ► The most common serotypes were 4b, 1/2b and 1/2a. ► A few isolates possessed the same pulsotype and serotype but were of different ribotypes.