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Abdelfattah EM, Ekong PS, Okello E, et al. Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows. PeerJ. 2021;9:e11108doi: 10.7717/peerj.11108.
Abdelfattah, E. M., Ekong, P. S., Okello, E., Chamchoy, T., Karle, B. M., Black, R. A., Sheedy, D., ElAshmawy, W. R., Williams, D. R., Califano, D., Tovar, L. F. D., Ongom, J., Lehenbauer, T. W., Byrne, B. A., & Aly, S. S. (2021). Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows. PeerJ, 9e11108. https://doi.org/10.7717/peerj.11108
Abdelfattah, Essam M, et al. "Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows." PeerJ vol. 9 (2021): e11108. doi: https://doi.org/10.7717/peerj.11108
Abdelfattah EM, Ekong PS, Okello E, Chamchoy T, Karle BM, Black RA, Sheedy D, ElAshmawy WR, Williams DR, Califano D, Tovar LFD, Ongom J, Lehenbauer TW, Byrne BA, Aly SS. Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows. PeerJ. 2021 Apr 20;9:e11108. doi: 10.7717/peerj.11108. eCollection 2021. PMID: 33976962; PMCID: PMC8063881.
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PeerJ. 2021 Apr 20;9:e11108. doi: 10.7717/peerj.11108. eCollection 2021.

Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows.

PeerJ

Essam M Abdelfattah, Pius S Ekong, Emmanuel Okello, Tapakorn Chamchoy, Betsy M Karle, Randi A Black, David Sheedy, Wagdy R ElAshmawy, Deniece R Williams, Daniela Califano, Luis Fernando Durán Tovar, Jonathan Ongom, Terry W Lehenbauer, Barbara A Byrne, Sharif S Aly

Affiliations

  1. Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Davis, Tulare, CA, USA.
  2. Department of Animal Hygiene, and Veterinary Management, Faculty of Veterinary Medicine, Benha University, Moshtohor, Qalyubia, Egypt.
  3. Department of Epidemiology, National Veterinary Research Institute, Vom, Plateau State, Nigeria.
  4. Department of Population Health & Reproduction, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA.
  5. Cooperative Extension, Division of Agriculture and Natural Resources, University of California, Davis, Orland, CA, USA.
  6. Cooperative Extension, Division of Agriculture and Natural Resources, University of California, Davis, Santa Rosa, CA, USA.
  7. Department of Internal Medicine and Infectious Diseases, Cairo University, Giza, Giza, Egypt.
  8. Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, Davis, CA, USA.

PMID: 33976962 PMCID: PMC8063881 DOI: 10.7717/peerj.11108

Abstract

BACKGROUND: This study describes the occurrence of antimicrobial resistance (AMR) in commensal

METHODS: The study was conducted on ten dairies distributed across CA's three milk sheds: Northern California (NCA), Northern San Joaquin Valley (NSJV), and the Greater Southern California (GSCA). On each study dairy, individual fecal samples were collected from two cohorts of lactating dairy cows during the fall/winter 2018 and spring/summer 2019 seasons. Each cohort comprised of 12 cows per dairy. The fecal samples were collected at enrollment before calving (close-up stage) and then monthly thereafter for four consecutive time points up to 120 days in milk. A total of 2,171

RESULTS: The

CONCLUSIONS: Our findings showed high rates of AMR to several drugs that are not labeled for use in lactating dairy cattle 20 months of age or older. Conversely, very low resistance was observed for drugs labeled for use in adult dairy cows, such as cephalosporins and penicillin. Overall, our findings identified important differences in AMR by antimicrobial class, region and season.

© 2021 Abdelfattah et al.

Keywords: Antimicrobial resistance; California; Cohort study; Dairy cattle; Enterococcus spp; Escherichia coli; Multidrug resistance; Phenotype; Region; Season

Conflict of interest statement

Sharif Aly is an Academic Editor for PeerJ.

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