Prevalence of nasal carriers of methicillin-resistant Staphylococcus aureus among dental students: An in vivo study

Aim : The aim of this study is to evaluate the prevalence of nasal carriage of coagulase positive methicillin-resistant Staphylococcus aureus (MRSA) among dental students. Materials and Methods: Four hundred dental students, divided into two groups – undergraduates (200) and postgraduates (200), were screened using sterile cotton swabs for carriage of MRSA in anterior nares. The samples were inoculated on HiCrome MeReSa Agar Base-with cefoxitin supplement. Further confirmatory tests were done by Gram-staining, Tube coagulase and Cefoxitin disc diffusion test on Mueller–Hinton agar. Results: MRSA was positive among 25 (12.50%) undergraduates and 49 (24.50%) postgraduates students. Further confirmatory test also showed the same results. MRSA colonization was significantly more in postgraduate students, who are exposed to more number of patients and have put in more clinical hours as compared to undergraduate students who have just entered clinics and have limited clinical exposure. Conclusion: The present study concluded that rate of MRSA colonization was 18.5% in the dental school population. The colonization rate was significantly ( P = 0.002%) higher in postgraduate students as compared to undergraduate students emphasizing the need to follow infection control protocols stringently. Clinical Significance: Awareness about MRSA among dental doctors is mandatory so as to prevent transmission of MRSA in dental settings.