American Board of Internal Medicine (ABIM) Certification Practice Exam

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What is a common association with multiple boils infected by Mycobacterium fortuitum?

Swimming in lakes
Razor shaving
Animal bites
Food handlers

The correct answer is: Razor shaving

The association of multiple boils infected by Mycobacterium fortuitum with razor shaving stems from the bacteria’s propensity to enter the skin through micro-abrasions or cuts that can occur during the shaving process. This particular mycobacterium is known to be part of the natural flora of the environment and can be introduced into the skin through various means. Razor shaving, especially if performed with contaminated razors or in an unclean environment, can lead to skin trauma, making it easier for the bacteria to invade and cause infections. Patients may develop folliculitis or boils as a result of this infection, which can present as recurrent or multiple lesions. The other options, while they can lead to skin infections or other types of bacteria, do not have the same direct link with Mycobacterium fortuitum specifically in the context of causing boils as seen with the practice of razor shaving.