B. M. Osman, Mohammed, 		Edriss, Ali A., 		El-mahdy, Ebrahim E., AND 		M. Mekki, Abdelwhab.
" DETECTION OF CHRONIC TYPHOID CARRIERS AMONG FOOD HANDLERS IN WAD MEDANI , GEZIRA STATE , SUDAN" <em>Gezira Journal of Health Sciences</em> [Online], Volume 7 Number 1 (1 June 2011)