What type of immunity is provided by vaccinations?

• A. Natural active
• B. Artificial active
• C. Natural passive
• D. Artificial passive

Answer: (B)

Vaccinations provide artificial active immunity. Active immunity means the immune system is stimulated to produce its own antibodies and memory cells in response to an antigen. Vaccines present a safe form of a pathogen or its components, so the immune system mounts a response and develops immunological memory without causing the disease. Because the body creates its own defenses, protection tends to be long-lasting and can be boosted with later doses. This differs from natural active immunity, which occurs after actual infection, and from passive immunity, which involves receiving ready-made antibodies (either naturally from a mother or artificially via antibody injections) and provides immediate but temporary protection.