iraj nikokar microbiology and immunology of infectious disease laboratory, guilan university of medical sciences manouchehr makvandi department of microbiology, ahwaz university of medical sciences mohammad javad kajbaf department of microbiology, ahwaz university of medical sciences ahmad farajzadeh department of microbiology, ahwaz university of medical sciences mehdi mirsaeidi department of tuberculosis, national research institute of tuberculosis and lung diseases, shahid beheshti university of medical sciences eskandar kamali-sarvestani department of immunology and ali mostafaie