Question

A person who got infected chicken pox is highly unlikely to get infected again in their lifetime. What kind of immunity is this?

• A. Acquired immunity
• B. Natural immunity
• C. Viral immunity
• D. None of the above

Answer 1

The correct option is A

Acquired immunity

Artificially acquired active immunity can be induced by a vaccine, a substance that contains antigen. A vaccine stimulates a primary response against the antigen without causing symptoms of the disease. The learning process starts when a person's immune system encounters foreign invaders and recognizes nonself substances (antigens). ... Acquired immunity is also called specific immunity because it tailors its attack to a specific antigen previously encountered.