Active artificially acquired immunity is a result of __________.

• A. vaccination
• B. contact with a pathogen
• C. contact with toxins secreted by pathogens
• D. antibodies passed on from mother to fetus through the placenta
• E. antibodies passed on from mother to baby through breast milk

Answer: (A)

Verified step by step guidance

1. Understand the concept of active artificially acquired immunity. This type of immunity involves the introduction of antigens into the body through medical intervention, rather than natural exposure.
2. Recognize that vaccination is a process where a weakened or inactive form of a pathogen is introduced into the body to stimulate the immune system to produce antibodies.
3. Differentiate between active and passive immunity. Active immunity involves the body's direct response to the pathogen, while passive immunity involves receiving antibodies from another source.
4. Consider the options provided: vaccination, contact with a pathogen, contact with toxins, antibodies from mother to fetus, and antibodies from mother to baby. Identify which option involves a medical intervention to stimulate the immune system.
5. Conclude that vaccination is the correct answer as it is a deliberate introduction of antigens to develop immunity, fitting the definition of active artificially acquired immunity.