fard m forozsh school of medicine, semnan university of medical sciences. g irajian department of microbiology, school of medicine, tehran university of medical sciences. z moslehi-takantape department of microbiology, school of medicine, tehran university of medical sciences and department of microbiology, school of medicine, isfahan university of medical sciences. h fazeli department of microbiology, school of medicine, isfahan university of medical sciences. m salehi department of microbiology, school of medicine, isfahan university of medical sciences. s rezania department of microbiology, school of medicine, tehran university of medical sciences.