A total of 105 random samples of meat products including 45 fresh minced meat, 30 Fresh sausage and 30 Frozen hamburger were collected
a different sources in Assiut city. The samples were examined for enumeration of Pseudomonas organisms. The obtained results pointed out that 71.11%, 43.33% and 26.7% of the examined fresh minced meat,
fresh sausage and frozen hamburger samples were positive for Pseudomonas microorganisms with an average count of 3.2x104, 1.07x10' and 2.2x10°/g using surface spread plate technique respectively. Biochemical and enzymatic activities for 8 isolates of Pseudomonas aeruginosa were investigated. It was noticed that the exoproducts of isolates exhibited lethal effect when injected intraperitoneally into white mice. Concerning the antibiotic sensitivity of the 8 isolated strains of Pseudomonas aeruginosa to 8 antimicrobial agents in vitro, they were only sensitive to Gentamicin, polymyxin -B and Chloramphenicol with an activity of 100%, 87.5% and 12.5% respectively