Introduction: Methicillin resistant Staphylococcus aureus (MRSA) is a zoonotic pathogen that is associated with serious and sometimes fatal infections in humans. The pathogen has ability to acquire resistance to most antibiotics. Working in slaughterhouses increase the chance of workers to contract this pathogen. This study aimed to determine the prevalence of MRSA and its associated factors among slaughterhouse workers in Dar es Salaam, Tanzania. Methods: A cross-sectional study was conducted from June-July 2018 involving workers from 4 registered slaughterhouses. Social demographics and other information was collected using a semi-structured questionnaire. Swabs were collected and inoculated in Mannitol salt agar for S. aureus isolation. The isolates were tested for antimicrobial susceptibility using 10µg Oxacillin discs implanted on Muller Hinton Agar plates. Binary logistic regression was employed to determine the association between prevalence of MRSA and independent variables. Results: MRSA was isolated from 39,2% of the 258 enrolled slaughterhouse workers. MRSA colonization was more likely in persons who have been working for more than 21 years (p=0,014) and smokers (p=0,02). On-job training (adjOR=0,417; 95% CI: 0,202-0,858, p= 0,018) was protective against MRSA nasal colonization. Conclusion: Our study has demonstrated the occurrence of MRSA in slaughterhouse workers in Dar es salaam, Tanzania. It is more prevalent in persons who have been working for a long time in slaughterhouses. In addition, provision of on-job training is protective against MRSA nasal colonization. More studies are required to confirm whether the MRSA detected were livestock-associated.
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