mohammad salehi medical diagnostic laboratory of neyshabour, center of medical, pathological and genetic diagnostic services, iranian academic center for education, culture and research (acecr), mashhad branch, mashhad, iran seyyed khalil shokouhi mostafavi department of microbiology, islamic azad university, tehran medical science branch, tehran, iran abdolmajid ghasemian department of microbiology, faculty of medicine, aja university of medical sciences, tehran, iran mahmoud gholami department of biology, faculty of sciences, university of isfahan, isfahan, iran abdolrahim kazemi-vardanjani shahrekord university of medical sciences, shahrek mohammad karim rahimi department of microbiology, islamic azad university, tehran medical science branch, tehran, iran