Bagher Moradi, Mojtaba Sankian, Yousef Amini, Zahra Meshkat,

fatemeh farshadpour department of microbiology and parasitology, school of medicine, bushehr university of medical sciences, bushehr, ir iran; health research institute, infectious and tropical disease research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran manoochehr makvandi health research institute, infectious and tropical disease research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran reza taherkhani department of microbiology and parasitology, school of medicine, bushehr university of medical sciences, bushehr, ir iran; persian gulf tropical medicine research center, bushehr university of medical sciences, bushehr, ir iran; department of microbiology, school of medicine, bushehr university of medical sciences, moallem st., bushehr, ir iran. tel: +98-9171712653, fax: +98-77125220814