Direct transmission is best defined as which of the following?

• A. Airborne spread through coughing
• B. Direct contact between patient and environment
• C. Indirect transmission via surfaces
• D. Person to person contact

Answer: (D)

Direct transmission means the infectious agent moves straight from one person to another without an intermediate object or environment mediating the transfer. This is most clearly captured by person-to-person contact, where the pathogen passes during direct touch or very close interaction without a surface or air acting as a bridge. Airborne transmission, even when it comes from coughing, involves pathogens traveling through the air and potentially reaching a person at some distance, which is considered a separate transmission route. Indirect transmission via surfaces requires the agent to contaminate an object first and then be picked up, so it’s not direct. The idea is the transfer happens directly between people without an intermediary.