COCKROACH-ASSOCIATED FOOD-BORNE BACTERIAL PATHOGENS FROM SOME HOSPITALS AND FOOD HANDLING ESTABLISHMENT IN ADDIS ABABA By Erdaw Tachbele Betre A thesis submitted to the School of Graduate Studies of Addis Ababa University in partial fulfillment ofthe requin)ments for the degree of Masters of Science in Biomedical Sciences (Parasitology). June 2004