Exposure to a vaccine that stimulates a primary immune response leads to which type of immunity?

• A. Active artificial immunity
• B. Passive artificial immunity
• C. Passive natural immunity
• D. Active natural immunity

Answer: (A)

Verified step by step guidance

1. Understand the key terms: 'active immunity' refers to the body's own immune system producing antibodies in response to an antigen, while 'passive immunity' involves receiving pre-made antibodies. 'Artificial' refers to immunity induced by medical intervention (e.g., vaccines), and 'natural' refers to immunity acquired through natural exposure (e.g., infection).
2. Analyze the question: A vaccine introduces a harmless form of an antigen into the body to stimulate the immune system to produce its own antibodies. This process mimics a natural infection but is medically induced.
3. Determine the type of immunity: Since the immune system is actively producing antibodies in response to the vaccine, this is 'active immunity.'
4. Classify the immunity as artificial or natural: Because the immunity is induced by a vaccine (a medical intervention), it is classified as 'artificial.'
5. Combine the classifications: The immunity stimulated by a vaccine is 'active artificial immunity.'