Incidence and characterization of pseudomonas aeruginosa in milk and some dairy products

ABSTRACT

In this study, 100 r and om samples of raw milk and some milk products were collected from various localities at Alexandria city and were investigated for incidence of Pseudomonas aeruginosa, serotyping and antibiotic susceptibility. The obtained results pointed out that 53.33%, 12%, 32%, 30% of the examined samples of raw milk, pasteurized milk, table butter and market cream were contaminated with Pseudomonas aeruginosa organism respectively. Serological identification of the various isolated strains of Ps. aeruginosa revealed that 4[25%], 3[18.8%], 1[6.3%], 1[6.25%], 2[12.5%], 1[6.3%], 1[6.3%], 1[6.3%], 2[12.5%] strains of raw milk belonged to serotypes P1, P3, P6, P10, P14, P2, P5, P7, P12 respectively. 1[33.3%], 2[66.7%] of pasteurized milk isolated strains were belonged to serotypes P1 and P14 respectively. 2[25%], 2[25%], 1[12.5%] and 3[37.5%] of table butter strains belonged to serotypes P3, P10, P16 and P7 respectively. 1[16.7%], 2[33.3%], 1[16.7%], 2[33.3%] of market cream strains belonged to serotypes p1, P4, P13, P11 respectively. All the strains were resistant to gentamicin, tobramycin and cefotaxin and the resistance varied between 58.74%. All were sensitive to ofloxacin and amikacin, while resistance percentage to ceftriaxone and cefoperazone was the same [42%]. The public health significance of the isolated organism as well as these findings were discussed