Which term can refer to coming in contact with a disease-causing factor, such as exposure to a virus?

• A. Exposure
• B. Infection
• C. Transmission
• D. Contamination

Answer: (A)

The main idea here is recognizing the moment you come into contact with a disease-causing factor. This is what exposure describes: the event or period when you are exposed to a pathogen or its source through routes like inhalation, ingestion, or direct contact. Exposure is the initial step in the sequence that can lead to disease, but it doesn’t by itself mean you are infected. Infection means the pathogen has entered your body, multiplied, and established an active infection. Transmission refers to how a pathogen moves from one person to another, not the contact with the source itself. Contamination means the pathogen is present on surfaces or objects, which poses a potential risk but does not imply you have personally encountered the pathogen. So, when the question asks about coming in contact with a disease-causing factor, exposure is the best term.