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Antimicrobial resistance pattern of Salmonella serotypes isolated from food items and personnel in Addis Ababa, Ethiopia

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Antimicrobial susceptibility test of 98 isolates of Salmonella was assayed from September 2003 to February 2004 using the guidelines of the National Committee for Clinical Laboratory Standards (NCCLS).The result revealed that 32.7% of Salmonella isolates were resistant to one or more of the 24 antimicrobials tested. Generally resistance for 13 different antimicrobial drugs was recognized. The most common resistance was to streptomycin (24/32, 75%), ampicillin (19/32, 59.4%), tetracycline (15/32, 46.9%), spectinomycin (13/32, 40.6%) and sulfisoxazole (13/32, 40.6%). All the three Salmonella Kentucky isolates showed resistance to at least 8 antimicrobials. Out of the 12 Salmonella Braenderup isolates, 10 (83.3%) showed multidrug resistance to ampicillin, spectinomycin, streptomycin, sulfisoxazole, sulfamethoxazole/trimethoprim, amoxicillin/clavulanic acid and trimethoprim. Among the 8 S. Hadar isolates 7 (86.5%) showed antimicrobial resistance. All the 6 S. Dublin isolates were resistant to carbadox (100%). All the 6 S. Haifa isolates were resistant for at least ampicillin, streptomycin and tetracycline. Up to ten different antimicrobial resistances pattern was observed. Multiple antimicrobial drug resistance was observed in 23 Salmonella isolates (23.5%). The level of antimicrobial resistance was significantly higher for isolates from chicken carcass (18/29, 62.1%) and pork isolates (5/22, 22.7%) (p = 0.003). The findings of the present study ascertain that significant proportion Salmonella isolates have developed resistance for routinely prescribed antimicrobial drugs and poses considerable health hazards to the consumers unless prudent control measures are instituted.

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  • Acha, P.N. and Szyfres, B. (2001): Zoonoses and Communicable Diseases Common to Man and Animals. 3rd ed., Washington DC: Pan American Health Organization, Vol.1. Pp 233–246.

  • Adesiyun, A.A., and Oni, O.O. (1989): Prevalence and Antibiograms of salmonellae in slaughter cattle, slaughter areas and effluents in Zaria abattoir, Nigeria. Journal of Food Protection, 52 (4): 232–235.

    Google Scholar 

  • Alemayehu, D., Molla, B., and Muckle, A. (2004): Prevalence and antimicrobial resistance pattern of Salmonella isolates from apparently healthy slaughtered cattle in Ethiopia. Tropical Animal Health and Production, 35: 309–319. DOI 10.1023/A:1025189204496.

    Article  Google Scholar 

  • Angulo, F., Johnson, K., Tauxe, R., and Cohen, M. (2000): Significance and source of antimicrobial-resistant nontyphoidal Salmonella infection in the United States. Microbial Drug resistance, 6 (1): 77–83.

    Article  PubMed  CAS  Google Scholar 

  • Ashenafi, M., and Gedebou, M. (1985): Salmonella and Shigella in adult diarrhea in Addis Ababa – prevalence and antibiograms. Transaction of the Royal Society of Tropical Medicine and Hygiene, 79: 719–721 Medline. DOI 10.1016/0035-9203(85)90201-9.

    Article  CAS  Google Scholar 

  • Cloeckaert, A., Boumedine, K.S., Flaujac, G., Imberechts, H., D’Hooghe, I., Chaslus-Dancla, E. (2000): Occurrence of a Salmonella enterica serovar typhimurium DT104-like antibiotic resistance gene cluster including the floR gene in S. enterica serovar agona. Antimicrobial Agent Chemotherapy, 44 (5): 1350–13461. DOI 10.1128/AAC.44.5.1359-1361.2000.

    Google Scholar 

  • D’Aoust, J.-Y. (1989): Salmonella. In: Doyle, M.P. (ed). Foodborne Bacterial Pathogens. New York Marcel Dekker Inc. Pp 327–445.

  • D’Aoust, J.-Y. (1994): Salmonella and the international food trade. International Journal of Food Microbiology, 24: 11–31 Medline. DOI 10.1016/0168-1605(94)90103-1.

    Article  PubMed  CAS  Google Scholar 

  • D’Aoust, J.-Y. (1991): Pathogenecity of foodborne Salmonella. International Journal of Food Microbiology, 12: 17–40 Medline. DOI 10.1016/0168-1605(91)90045-Q.

    Article  PubMed  CAS  Google Scholar 

  • D’Aoust, J.-Y., Sewell, A.M., Daley, E., and Greco, P. (1992): Antibiotic resistance of agricultural and foodborne Salmonella isolated in Canada: 1986–1989. Journal of Food Protection, 55 (6), 428–434.

    CAS  Google Scholar 

  • Diaz De Aguayo, M.E., Duarte, A.B.L., and Montes De Oca Canastillo, F. (1992): Incidence of multiple antibiotic resistant organisms isolated from retail milk products in Hermosillo, Mexico. Journal of Food Protection, 55 (5): 370–373.

    CAS  Google Scholar 

  • Fey, P.C., Safranek, T.J., Rupp, M.E., Dunne, E.F., Ribot, E., Iwen, P.C., Bradford, P.A., Angulo, F.J., and Hinrichs, S.H. (2000): Ceftriaxone-resistant Salmonella infection acquired by a child from cattle. New England Journal of Medicine, 342 (17): 1242–1249 Medline. DOI 10.1056/NEJM200004273421703.

    Article  PubMed  CAS  Google Scholar 

  • Gebreyes, W.A., Davies, P.R., Morrow, W.E.M., Funk, J.A. and Altier, C. (2000): Antimicrobial resistance of Salmonella isolated from swine. Journal of Clinical Microbiology, 38 12: 4633–4635 Medline.

    PubMed  CAS  Google Scholar 

  • Gedebou, M. and Tassew, A. (1981): Antimicrobial resistance and R factor of Salmonella isolates from Addis Ababa. Ethiopian Medical Journal, 19: 77–85 Medline.

    PubMed  CAS  Google Scholar 

  • Glynn, M.K., Bopp, C., Dewitt, W., Dabney, P., Mokhtar, M., and Angulo, F.J. (1998): Emergence of multidrug-resistant Salmonella enterica serotype Typhimurium DT104 infection in the United States. New England Journal of Medicine, 338 (19): 1333–1339 Medline. DOI 10.1056/NEJM199805073381901.

    Article  PubMed  CAS  Google Scholar 

  • Gorbach, S.L. (2001): Antimicrobial use in animal feed – time to stop. New England Journal of Medicine, 345 (16): 1202–1203 Medline. DOI 10.1056/NEJM200110183451610.

    Article  PubMed  CAS  Google Scholar 

  • Guthrie, R.K. (1992): Salmonella. CRS Press, USA. Pp 23–156.

  • Hadfield, T.L. and Monson, M.H. (1985): An outbreak of antibiotic-resistant Salmonella Enteritidis in Liberia, West Africa. Journal of Infectious Disease, 151 (5): 790–795 Medline.

    CAS  Google Scholar 

  • Hohmann, E.L. (2001): Nontyphoidal salmonellosis. Clinical Infectious Disease, 32: 253–269. DOI 10.1086/318457.

    Article  Google Scholar 

  • Hummel, P.H. (1979): Antibiotic resistance among salmonellae isolated from animals in Tanzania. Bulletin of Animal Health and Production in Africa, 27: 113–121.

    CAS  Google Scholar 

  • International Organization for Standardization 6579 (1998): Microbiology of food and animal feeding stuff-horizontal method for the detection of Salmonella, ISO, Geneva.

  • Lee, L.A., Threatt, V.L., Puhr, N.D., Levine, P., Ferris, K., Tauxe, R.V. (1993): Antimicrobial–resistant Salmonella spp isolated from healthy broiler chickens after slaughter. Journal of American Veterinary Medical Association, 202 (5): 752–755 Medline.

    CAS  Google Scholar 

  • Leegaard, T.M., Van Gestel, M.H., Petit, P.L.C., and Van De Klundert, J.A.M. (1996): Antibiotic resistance mechanisms in Salmonella species causing bacteraemia in Malawi and Kenya. Acta Pathologica Microbiologica et Immunologica Scandinavica, 104: 302–306.

    CAS  Google Scholar 

  • Lesser, C.F., and Miller, S.I. (2001): Salmonellosis. In: Harrison’s Principles of Internal Medicine. Braunwald, E., Fauci, A.S., Kasper, D.L., Hauser, S.L., Longo, D.L., and Jameson, J.L. (eds.) 15 th ed. Vol.1, The McGraw – Hill Companies, Inc. India. Pp 973–975.

  • Mache, A. (2002): Salmonella serogroups and their antibiotic resistance patterns isolated from diarrhoeal stools of padiatric out-patients in Jimma Hospital and Jimma Health Center, South West Ethiopia. Ethiopian Journal of Health Science, 12 (1): 37–45.

    Google Scholar 

  • Mache, A., Mengistu, Y., and Cowley, S. (1997): Salmonella serogrouups identified from adult diarrhoeal out-patients in Addis Ababa, Ethiopia: Antibiotic resistance and plasmid profile analysis. East African Medical Journal, 74 (3): 183–186 Medline.

    PubMed  CAS  Google Scholar 

  • Mølback, K., Baggesen, D.L., Aarestrup, F.M., et al., (1999): An outbreak of multi-drug resistant, quinolone-resistant Salmonella enterica serotype Typhimurium DT 104. New England Journal of Medicine, 19: 1420–1425. DOI 10.1056/NEJM199911043411902.

    Article  Google Scholar 

  • Molla, B.,Kleer, J. and Sinell, H.-J. (1999a): Occurrence, distribution and level of Salmonella in selected food items in Addis Ababa (Ethiopia). Fleischwirtschaftlisch International, 4: 37–39.

    Google Scholar 

  • Molla, B., Kleer, J. and Sinell, H.-J. (1999b): Antibiotic resistance pattern of foodborne Salmonella isolates in Addis Ababa (Ethiopia). München Tierärztlisch Wochenschr 112:41–43.

    CAS  Google Scholar 

  • Molla, B, Mesfin, A, and Alemayehu, D. (2003): Multiple antimicrobial–resistant Salmonella serotypes isolated from chicken carcass and giblets in Debre Zeit and Addis Ababa, Ethiopia. Ethiopian Journal of Health Development, 17 (2): 131–149.

    Google Scholar 

  • National Committee for Clinical Laboratory Standards (1999): Performance standards for antimicrobial disc and dilution susceptibility tests for bacteria isolated from animals and humans. Approved Standard. NCCLS Document M31– A, NCCLS, Villanova, PA.

  • Nyeleti, C., Molla, B., Hilderbandt, G., and Kleer, J. (2000): The prevalence and distribution of Salmonella in slaughter cattle, slaughterhouse personnel and minced beef in Addis Ababa, Ethiopia. Bulletin of Animal Health and Production in Africa, 48: 19–24.

    Google Scholar 

  • Olsen, S.J., DeBess, E.E., McGivern, T.E., Marano, N., Eby, T., Mauvais, S., Balan, V.K. Zirnstein, G. Cieslak, P.R. and Angulo, F.J. (2001): A nosocomial outbreak of fluoroquinolone-resistant Salmonella infection. New England Journal of Medicine, 344 (21): 1572–1579 Medline. DOI 10.1056/NEJM200105243442102.

    Article  PubMed  CAS  Google Scholar 

  • Prescott, J.P. and Baggot, J.D. (1993): Antimicrobial susceptibility and drug dosage prediction. Sulfonamides,trimethoprim, ormetoprim and their combinations. Miscellaneous antibiotics: Ionophores, nitrofurans, nitroimidazoles, rifampin, and others. In: J.P. Prescott and J.D. Baggot (eds.) Antimicrobial Therapy in Veterinary Medicine. II Iowa State University Press; Pp 11–20.

  • Tellefson, L., Angulo, F., and Fedorka-Cray, P. (1998): National surveillance for antibiotic resistance in zoonotic enteric pathogens. Veterinary Clinics of North America and Food Animal Practice, 14 (1): 141–150 Medline.

    Google Scholar 

  • Tibaijuka, B., Molla, B., Hilderbrandt, G. and Kleer, J. (2003): Occurrence of salmonellae in retail raw chicken products in Ethiopia. Berlin München Tieräztlisch Wschenschr 116: 55–58.

    Google Scholar 

  • Van Duijkeren, E., Slot Van Oldruitenborgh Oosterbaan, M.M., Houwers, D.J., Van Leeuwen, W.J. and Kalsbeek, H.C. (1994b): A study of equine salmonellosis in a Dutch veterinary teaching hospital. Veterinary Record, 135: 248–250 Medline.

    PubMed  Google Scholar 

  • Wall, P.G., Morgan, D., and Lamden, K. (1994): A case control study of infection with an epidemic strain of multi-resistant Salmonella Typhimurium DT 104 in England and Wales. Communicable Disease Report Review, 4: 130–135.

    Google Scholar 

  • White, D.G., Zhao, S., Sudler, R., Ayers, S., Friedman, S., Chen, S., McDermott, S., Waner, D.D., Meng, J. (2001): The isolation of antibiotic-resistant Salmonella from retail ground meats. New England Journal of Medicine, 345 (16): 1147–1154 Medline. DOI 10.1056/NEJMoa010315.

    Article  PubMed  CAS  Google Scholar 

  • Witte, W. (1998): Medical consequences of antibiotic use in agriculture. Science, 279 (5353): 996–997 Medline. DOI 10.1126/science.279.5353.996.

    Article  PubMed  CAS  Google Scholar 

  • World Health Organization (1988): Salmonellosis Control: The Role of Animal and Product Hygiene, Technical Report Series 774, World Health Organization, Geneva.

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I am extremely grateful to Dr. Anne Muckle, head of Laboratory for Foodborne Zoonoses, Health Canada, and Dr. Cornelius Poppe and Ms. Linda Cole at the Office International des Epizooties (OIEì), Reference Laboratory for Salmonellosis, in Guelph, Ontario, Canada, for their excellent endeavors in serotyping, phage typing and antimicrobial susceptibility testing of Salmonella isolates. The financial assistance of Addis Ababa University is highly acknowledged.

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Correspondence to Endrias Zewdu.

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Zewdu, E., Cornelius, P. Antimicrobial resistance pattern of Salmonella serotypes isolated from food items and personnel in Addis Ababa, Ethiopia. Trop Anim Health Prod 41, 241–249 (2009).

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