Prevalence, and virulence determination of Listeria monocytogenes strains isolated from clinical and non-clinical samples by multiplex polymerase chain reaction oleh Abazar Pournajaf, Ramazan Rajabnia, Mansour Sedighi, Aziz Kassani, Vahid Moqarabzadeh, Lida Lotfollahi, Abdollah Ardebilli, Behzad Emadi, Gholamreza Irajian