Differentiate isolation from quarantine.

• A. Isolation separates individuals with a contagious disease; quarantine separates healthy individuals who may have been exposed
• B. Isolation and quarantine are the same
• C. Quarantine separates sick people; isolation is for those exposed
• D. Isolation prevents disease by vaccines

Answer: (A)

The idea being tested is how public health separates people based on infection status and the reason for separation. Isolation is used when someone is already infected or clearly contagious; they are kept apart from others during the period they can spread the disease to prevent further transmission. Quarantine, on the other hand, applies to people who were exposed to a contagious disease but are not yet ill; they stay separate for the incubation period to see if they develop illness and to prevent potential spread if they do become contagious. So the statement that isolation separates individuals with a contagious disease and quarantine separates healthy individuals who may have been exposed cleanly captures the intended difference. For context, imagine someone who tests positive for a contagious illness being kept away from others, versus someone who had close contact with an infected person being monitored or restricted to see if they develop symptoms. The other ideas mix up who is being separated or suggest unrelated measures like vaccination, which aren’t the defining distinction here.