asghar ashrafi hafez cancer research center, shahid beheshti university of medical sciences, tehran, ir iran abbas ahmadi vasmehjani department of microbiology and immunology, jahrom university of medical sciences, jahrom, ir iran rasoul baharlou department of microbiology and immunology, jahrom university of medical sciences, jahrom, ir iran seyed dawood mousavi nasab department of virology, faculty of medical sciences, tarbiat modares university, tehran, ir iran mohammad hasan davami department of microbiology and immunology, jahrom university of medical sciences, jahrom, ir iran; corresponding author: mohammad hasan davami, department of microbiology and immunology, jahrom university of medical sciences, jahrom, ir iran. tel: +98-7913336086, fax: +98-791341509,, e-mail: ahmad najafi department of microbiology and immunology, jahrom university of medical sciences, jahrom, ir iran

C K Low C K Chong H P Wong Y P Low