Multi-drug resistance in Salmonella serovars of zoonotic importance and detection of anti-microbial resistance genes*


  • CHANDRA SHEKHAR Associate Professor, Department of Veterinary Public Health and Epidemiology, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand 263 145 India
  • S P SINGH Head, Department of Veterinary Public Health and Epidemiology, College of Veterinary and Animal Sciences, N. D. University of Agriculture and Technology, Kumarganj, Faizabad



Animal faecal samples, Anti-microbial resistance genes, Foods of animal origin, Human stool, Multi-drug resistance, Salmonella serovars


Total 50 Salmonella isolates belonging to 10 different serovars comprising Salmonella Typhimurium (21), S. Weltevreden (12), S. Ughelli (5), S. Essen (3), S. Elisabethville (2), S. Lagos (2), S. Drogana (2), S. Enteritidis (1), S. London (1) and un-typable Salmonella-isolate (1) were isolated from 1,132 different samples. Extreme variation of anti-microbial resistance in Salmonella isolates was observed in a range from 0–100%. Maximum resistance was observed against sulphamethizole and furazolidone (100% each) followed by kanamycin (50%), gentamicin (44%), nalidixic acid (14%), tobramycin (10%), amikacin, ampicillin, streptomycin and tetracycline (8% each), amoxicillin/clavulanic acid (6%), norfloxacin (4%), ciprofloxacin and cefotaxime (2% each) and chloramphenicol (0%). High level of sensitivity in Salmonella isolates was observed against chloramphenicol (100%) and tetracycline (92%). The anti-microbial resistance genes detected were blaTEM, tetA, aphAI-LAB, aadB and strA in Salmonella serovars that showed resistance against ampicillin, tetracycline, kanamycin, gentamicin and streptomycin, respectively. The blaTEM gene was present in all ampicillin resistant Salmonella isolates (100%) and strA gene in all streptomycin resistant Salmonella isolates (100%) followed by tetA gene in 75% tetracycline resistant Salmonella isolates, aadB gene in 14.28% gentamicin resistant Salmonella isolates and aphAI-LAB gene in 8% kanamycin resistant Salmonella isolates. All Salmonella isolates (100%) were multi-drug resistant (MDR), indicating injudicious and extensive use of anti-microbial agents in these areas that may pose great risks to animal health and production. Moreover, MDR Salmonella serovars may pose great public health problems through consumption of foods of animal origin. Multi-drug resistance genes exhibited by all Salmonella serovars also indicated serious threats to the animal health and production including great risks to the public health.


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Carraminana J J, Rota C, Agustin I and Herrera A. 2004. High prevalence of multiple resistance to antibiotics in Salmonella serovars isolated from a poultry slaughterhouse in Spain. Veterinary Microbiology 104: 133–39. DOI:

CLSI. 2011. Performance standards for anti-microbial susceptibility testing; Twenty-First Information Supplement M100– S21 Vol. 31 No. 1, Jan. 20. CLSI document M100– S21 [ISBN 1–56238–742-1]. CLSI 940 West Valley Road, Suite 1444, Wayne, Pennsylvania 19087, USA.

Fonseca E L, Mykytczuk O L, Asensi M D, Reis E M, Ferraz L R, Paula F L, Ng L K and Rodrigues D P. 2006. Clonality and anti-microbial resistance gene profiles of multidrug-resistant Salmonella enterica serovar Infantis isolates from four public hospitals in Rio de Janeiro Brazil. Journal of Clinical Microbiology 44: 2767–72. DOI:

Gebreyes W A and Altier C. 2002. Molecular characterization of multidrug-resistant Salmonella enterica subsp. enterica serovar Typhimurium isolates from swine. Journal of Clinical Microbiology 40 (8): 2813–22. DOI:

Lynne A M, Rhodes-Clark B R, Bliven K, Zhao S and Foley S L. 2008. Anti-microbial resistance genes associated with Salmonella enterica serovar Newport isolates from food animals. Anti-microbial Agents and Chemotherapy 52 (1): 353–56. DOI:

Mammina C, Cannova L, Massa S, Goffredo E and Nastasi A. 2002. Drug resistances in Salmonella isolates from animal foods. Epidemiology of Infections 129: 155–61. DOI:

Musgrove M T, Jones D R, Northcutt J K, Cox N A, Harrison M A, Fedorka-Cray P J and Ladely S R. 2006. Anti-microbial resistance in Salmonella and Escherichia coli isolated from commercial shell eggs. Poultry Science 85: 1665–69. DOI:

O’Brien T F. 2002. Emergence, spread and environmental effect of anti-microbial resistance: how to use of an anti-microbial anywhere can increase resistance to any microbial anywhere else. Clinical Infectious Diseases 34: 78–84. DOI:

Pezzella C, Ricci A, DiGiannatale E, Luzzi I and Carattoli A. 2004. Tetracycline and streptomycin resistance genes, trasposons and plasmids in Salmonella enterica from animals in Italy. Anti-microbial Agents and Chemotherapy 48: 903– 08. DOI:

Randall L P, Cooles S W, Osborn M K, Piddock L J and Woodward M J. 2004. Antibiotic resistance genes, integrons and multiple antibiotic resistance in thirty-five serotypes of Salmonella enterica isolated from humans and animals in the UK. Journal of Anti-microbial Chemotherapy 53: 208–16. DOI:

Sambrook J and Russell D W. 2001. Molecular cloning: a laboratory manual, 3rd edn. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, New York.

USDA/FSIS. 2002. Isolation and identification of Salmonella from meat, poultry and egg products, MLG 4.02, rev. 10/25/02.

USDA/FSIS Microbiology Laboratory Guidebook, 3rd edn. U.S. Department of Agriculture, FSIS, Washington, DC.

WHO/CDC. 2003. Salmonella serotype Typhi. In: manual for the laboratory identification of and anti-microbial susceptibility testing of bacterial pathogens of public health importance in the developing world.







How to Cite

SHEKHAR, C., & SINGH, S. P. (2015). Multi-drug resistance in Salmonella serovars of zoonotic importance and detection of anti-microbial resistance genes*. The Indian Journal of Animal Sciences, 85(2), 117–121.