Indirect transmission of infectious agents occurs through contact with

• A. An intermediate contaminated object or environmental surface
• B. Direct skin-to-skin contact
• C. Airborne droplets during sneezing
• D. Waterborne ingestion

Answer: (A)

Indirect transmission happens when an infectious agent rests on an intermediate object or environmental surface (a fomite) and is then transferred to a person who touches that surface and subsequently touches their face or mucous membranes. In a salon, examples include a contaminated comb, towel, or countertop that someone with an infection touched; another person then handles the item and contacts their eyes, nose, or mouth, acquiring the agent.

Direct skin-to-skin contact describes a transfer through immediate touch between people, not via a shared object. Airborne droplets involve the agent traveling through the air in droplets from sneezing or coughing, not through touching a surface. Waterborne ingestion means swallowing contaminated water, which is a different route than contact with an object or surface.