A total of 101 fresh water fish Tilapia nilotica were bacteriologically investigated for pathogenic and potentially pathogenic organisms. True intestinal pathogens were obtained in 11.8% of the examined specimens including 7.9% with enteropathogenic Escherichia coli and 3.9% with Salmonella species. Serological typing of Salmonella (4 strains) revealed the detection of Salmonella typhimurium (1 strain), S. wangata (2 strains), and S. newport (1 strain). Other potentially pathogenic organisms were isolated in considerable frequencies, Proteus spp. (43.5%) atypable E. coli (13.8%), Micrococcus spp. (11.8%) and Providencia (9.9%). Vibrio parahaemolyticus and Staphylococci were not detected in the examined samples.

Meat and meat products were undergone to adulteration due to its high price and cause many diseases and economic losses for consumers. Fifty samples of minced meat and sausage (25 each) were collected randomly from supermarkets in Assiut city. The samples were subjected to histological and chemical analysis for detection of adulteration. Histologically, adulteration was detected in minced meat and sausage by addition of smooth muscle fibers of hollow organs, heart muscles, spongy bone, thyroid glands, adipose tissue, lung, blood vessels, intestine, proventriculus, ruminant stomach, tendons, cartilage, fascia, nerve trunk, brain, plant tissues include poppy seeds, color additives, cysts and parts of parasites. By ATPase histochemistry, fetal tissue in minced meat and sausage were suspected to add with abundant dark (slow-contracted) muscle fiber than light (fastcontracting) ones. Adulteration of minced meat and sausage with bone tissues was a statistically significant difference