Transient flora on the skin are best described as:

• A. Permanent residents of skin microbiota
• B. Microbes that pass through briefly, acquired by direct or indirect contact
• C. Viruses that infect skin bacteria
• D. Microbes that only survive in extreme environments

Answer: (B)

Transient flora are microorganisms that make only a brief appearance on the skin, picked up from direct or indirect contact with people, objects, or the environment, and are readily removed by washing or normal cleansing. They do not establish long-term colonization because they cannot compete with the skin’s resident microbiota and are cleared by host defenses. This distinguishes them from the permanent residents that form the stable, ongoing skin microbiome. In contrast, the other options describe bacteriophages or extreme-environment inhabitants, which are not relevant to the concept of transient skin flora.