Östling Vildhede, Patricia, 2025. Prevalence of antimicrobial resistance in S. aureus and E. coli from lactating dairy cows in Maasai Mara, Kenya : a One Health perspective. Second cycle, A2E. Uppsala: SLU, Institutionen för Kliniska vetenskaper (KV-UDS)
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Abstract
Antimicrobial resistance (AMR) was found in an unexpectedly high prevalence in semi-domestic
cats in Mararianta 2024. A suspected cause for this high prevalence of AMR in cats was milk from
the Maasai dairy cows, because the milk is served to cats on a regular basis. The objective of this
study was to investigate the prevalence of AMR against a number of antibiotic agents (Benzylpenicillin, Cefoxitin, Meropenem, Ciprofloxacin, Gentamicin and Tigecycline) using the disk
diffusion test on S. aureus and E. coli isolated from milk. In this study a total of 124 cows were
screened for subclinical mastitis (SCM) using the California Mastitis Test (CMT). In total 22 milk
samples from udder quarters with SCM (CMT ≥ 3) and 10 swab samples from cat bowls and milk
containers were collected for cultivation and bacterial typing. In the tested population, 12.1% of
the cows had SCM and 1.6% of the population had S. aureus induced SCM. The scarce number of
cultivated bacteria made it impossible to draw a conclusion on the prevalence of AMR in S. aureus
and E. coli. Although, the unexpectedly low prevalence of SCM is an indication that the milk from
the Maasai dairy cows is not likely the cause of high AMR prevalence in the semi domestic cats in
Mararianta. Further research to establish the cause of high AMR prevalence in the cats is needed.
Keywords: antimicrobial resistance, AMR, One Health, subclinical mastitis, E. coli, S. aureus,
Maasai Mara, Kenya, milk, CMT, dairy cow
| Main title: | Prevalence of antimicrobial resistance in S. aureus and E. coli from lactating dairy cows in Maasai Mara, Kenya |
|---|---|
| Subtitle: | a One Health perspective |
| Authors: | Östling Vildhede, Patricia |
| Supervisor: | Dahlberg, Josef and Hård, Therese and Seligsohn, Dinah |
| Examiner: | Ntallaris, Theodoros |
| Series: | UNSPECIFIED |
| Volume/Sequential designation: | UNSPECIFIED |
| Year of Publication: | 2025 |
| Level and depth descriptor: | Second cycle, A2E |
| Student's programme affiliation: | VY009 Veterinary Medicine programme, 330.0hp |
| Supervising department: | (VH) > Institutionen för Kliniska vetenskaper (KV-UDS) |
| Keywords: | antimicrobial resistance, AMR, One Health, subclinical mastitis, E. coli, S. aureus, Maasai Mara, Kenya, milk, CMT, dairy cow |
| URN:NBN: | urn:nbn:se:slu:epsilon-s-22068 |
| Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-22068 |
| Language: | English |
| Deposited On: | 20 Apr 2026 09:59 |
| Metadata Last Modified: | 21 Apr 2026 01:02 |
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