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Prevalence and antimicrobial susceptibility of Streptococcus species isolated from bovine mastitis

젖소 유방염에서 분리한 Streptococcus 종의 분포 및 항생제 내성 분석

  • Kang, Hye Jeong (Bacterial Disease Division, Animal and Plant Quarantine Agency) ;
  • Hong, Serim (Bacterial Disease Division, Animal and Plant Quarantine Agency) ;
  • Park, Dasom (Bacterial Disease Division, Animal and Plant Quarantine Agency) ;
  • Kim, Ha-Young (Bacterial Disease Division, Animal and Plant Quarantine Agency) ;
  • Moon, Jin-San (Bacterial Disease Division, Animal and Plant Quarantine Agency)
  • 강혜정 (농림축산검역본부 세균질병과) ;
  • 홍세림 (농림축산검역본부 세균질병과) ;
  • 박다솜 (농림축산검역본부 세균질병과) ;
  • 김하영 (농림축산검역본부 세균질병과) ;
  • 문진산 (농림축산검역본부 세균질병과)
  • Received : 2022.08.02
  • Accepted : 2022.08.30
  • Published : 2022.09.30

Abstract

Streptococcus is one of the major pathogen groups inducing bovine mastitis. The aim of this study was to investigate the antimicrobial resistance patterns of Streptococcus species isolated from bovine mastitis milk samples in Korea from 2016 to 2021. In total, 181 (10.3%) Streptococcal isolates were collected from 1,761 quarter milk samples at 122 farms; S. uberis 39.2% (n=71), S. dysgalactiae 29.3% (n=53), S. equinus 9.9% (n=18), S. suis 6.1% (n=11), S. parauberis 4.4% (n=8), S. lutetiensis 3.9% (n=7), others 7.2% (n=13). However, S. agalactiae was not isolated. The isolates showed the highest resistance rate to tetracycline (55.2%) followed by erythromycin (45.3%) and pirlimycin (36.5%). In contrast, all isolates were susceptible to ceftiofur, cephalothin, penicillin/novobiocin, and only single S. equinus isolate was resistant to both ampicillin and penicillin. Of 181 isolates, 64 (35.4%) were multidrug resistance (MDR). The resistance to pirlimycin of S. uberis (73.2%) was much higher than that of other species (0~36.4%). All S. suis isolates were resistance to tetracycline. S. dysgalactiae showed lower resistance to erythromycin, pirlimycin and tetracycline than S. uberis and S. suis. The rate of MDR was relatively higher among S. uberis (73.2%) than among S. suis (36.4%), S. dysgalactiae (15.1%), others (0%). In conclusion, antimicrobial resistance in Streptococcus spp. should be regularly examined for appropriate therapies because the resistance patterns were various among the individual species.

Keywords

Acknowledgement

본 연구는 농림축산검역본부의 농림축산검역검사기술개발사업(과제명: 젖소 유방염 원인균 및 항생제 감수성 양상 조사, N-1543081-2017-36-01)의 연구비 지원에 의해 수행되었다.

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