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Prevalence and Antibiotic Resistance Pattern among the Mastitis Causing Microorganisms

Open Journal of Veterinary Medicine 2018年第4期8卷 54-64页

作者： karanvir singh Mudit Chandra Gurpreet Kaur Deepti Narang Dhiraj Kumar Gupta Department of Veterinary Microbiology College of Veterinary Science Guru Angad Dev Veterinary and Animal Sciences University Ludhiana India Department of Veterinary Clinical Medicine College of Veterinary Science Guru Angad Dev Veterinary and Animal Sciences University Ludhiana Punjab India

Mastitis is one of the most commonly occurring diseases of dairy animals. It is the most important cause of economic losses to the dairy industry in India and throughout the world. In the present study prevalence of microorganisms isolated from mastitic milk and their antibiotic resistance was studied. A total of sixty nine milk samples from mastitic animals (clinical and subclinical) were tested using sodium lauryl sulphate test and those positive were selected and transported to the laboratory for isolation and identification of the causative agent. Out of these samples fifty samples yielded bacterial growth when tested on selective/non selective medium. Of these fifty samples, seven samples had single bacterial growth whereas rest of the 43 samples had mixed growth. Among the bacterial isolates it was found that the highest prevalence was of Streptococcus agalactiae and Staphylococcus aureus followed by E. coli and Klebsiella pneumoniae. Antibiotic sensitivity test revealed that Streptococcus agalactiae revealed the highest sensitivity to ofloxacin, ciprofloxacin, gentamicin and resistance to amoxicillin and doxycycline;Staphylococcus aureus revealed the highest sensitivity to ciprofloxacin, doxycycline, azithromycin and sparfloxacin and resistance to amoxycillin and gentamicin. Similarly, E. coli revealed the highest sensitivity to azithromycin and chloramphenicol and resistance to amoxicillin and teicoplanin, and Klebsiella pneumoniae revealed highest sensitivity to azithromycin, gentamicin and resistance to amoxicillin, teicoplanin and erythromycin. Thus, from the present study it could be concluded that Streptococcus agalactiae, Staphylococcus aureus, E. coli and Klebsiella pneumoniae were the most frequently isolated organisms from mastitic animals and azithromycin and the third generation fluoroquinolones (ciprofloxacin, sparfloxacin and ofloxacin) were the most sensitive drugs.

关键词： Mastitis Milk Antibiotic Bacteria Resistance

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