Title: White coat as a contamination agent. Background: The study was delineated from the hypothesis of the irrational use of the white coats outside the place destined to its use, in that way transforming it into agent of contamination. Methods and Findings: We developed a questionnaire to be answered by volunteers approached on the campus of a private university, aiming at a social study of the reasons for the use of the white coat and awareness about its function. Our main limitation was in relation to medical students who only perform ambulatory care in associated clinics, but off campus. Results: The antibiogram didn't show no one significant resistance profile, instead of other studies that reporting even Staphylococcus aureus MRSA, but some Gram-positive isolates showed resistance for Penicillin, Ampicillin and Gentamicin and all Gram-negative isolates showed resistance for Amoxicillin. Conclusions: We can conclude that, mainly among students in the area of human health, there is a disinformation or disregard for the risk of transmission of pathogens by the lab coats. We found microorganisms of various types, mainly yeasts; however, among the isolated Gram-positive cocci, Staphylococcus aureus and coagulase-negative Staphylococcus sp. were the ones that corresponded to the largest number.