Which of the following is an example of indirect contact transmission?

Indirect contact transmission occurs when infectious agents are transmitted from one person to another through an intermediate object or surface, rather than through direct physical contact. In this case, touching a doorknob serves as an intermediary. When an infected person touches the doorknob, they can leave pathogens on its surface. If another person subsequently touches the doorknob and then touches their face, the infectious agent can be transferred and potentially cause an infection.

This mechanism highlights the significance of surfaces and objects in the spread of infections, especially in environments where multiple individuals interact with the same items. Maintaining proper hygiene, such as frequently washing hands or disinfecting common surfaces, is crucial in preventing indirect contact transmission.