The inhabitants of an isolated island experience an epidemic of a virus. All individuals are infected, and once they recover, the virus is absent for many years. Later, a visitor reintroduces the virus to the island. Only those individuals born after the initial outbreak are infected. What does this tell you about immunological memory?

MCQs on the immune system, including innate and adaptive immunity, the cells involved in each of process of the immune system and their role in the immune response, and how antibodies are used to confer immunity for future potential exposures.