Prevalence and antimicrobial resistance of Listeria monocytogenes, Salmonella enterica and Escherichia coli O157:H7 in imported beef cattle in Jordan

This study characterized Listeria monocytogenes, Salmonella enterica, and E. coli O157:H7 by collecting rectoanal mucosal swabs and fecal samples from 518 imported beef cattle at Jordan’s major abattoir. A unique 53 L. monocytogenes, 287 S. enterica, and 17 E. coli O157:H7 were isolated from 37, 120 and 9 different animals; respectively. The prevalence of S. enterica, L. monocytogenes and E. coli O157:H7 were 23.2% (95% CI, 19.7-27.0%), 7.1% (95% CI, 5.2-9.7%) and 1.7% (95% CI, 0.9-3.3%); respectively. All L. monocytogenes, all E. coli O157:H7 and 93.0% of S. enterica isolates resisted at least one antimicrobial class. All L. monocytogenes, 94.1% of E. coli O157:H7 and 69.7% of S. enterica isolates exhibited multidrug resistance (resistant to ≥3 antimicrobials classes). Moreover, high percentages of L. monocytogenes (98.1%), E. coli O157:H7 (64.7%) and S. enterica (45.3%) isolates resisted ≥5 antimicrobial classes. More than 90% of the L. monocytogenes isolates resisted ampicillin, penicillin and erythromycin and more than 75% resisted vancomycin. S. enterica isolates resisted several treatment-of-choice antimicrobials such as nalidixic acid (85.4%), ciprofloxacin (26.8%) and ceftriaxone (19.5%). Furthermore, greater than 50% of the E. coli O157:H7 isolates resisted streptomycin, nalidixic acid, tetracycline, ampicillin, sulfamethoxazole–trimethoprim, kanamycin, chloramphenicol and ciprofloxacin. The high prevalence and the high resistance percentages of the studied p...
Source: Comparative Immunology, Microbiology and Infectious Diseases - Category: Infectious Diseases Source Type: research