What is the process of injecting a modified disease organism into an animal called?

• A. Immunization
• B. Vaccination
• C. Inoculation
• D. Booster shot

Answer: (B)

The process of injecting a modified disease organism into an animal is called vaccination. Vaccination specifically involves administering a vaccine that contains either weakened, inactive, or modified forms of pathogens, or parts of these pathogens, to stimulate the immune system. This process prepares the body to recognize and fight off the actual disease-causing organisms if encountered in the future, by essentially "training" the immune system to respond efficiently.

While inoculation is a term that can also refer to the introduction of a substance into the body, it is a more general term that does not specifically imply the use of vaccines aimed at preventing disease. Immunization is the broader concept that often includes the outcome that results from vaccination but doesn’t refer to the act of administering the vaccine itself. A booster shot refers to an additional dose of a vaccine given after the initial vaccination to enhance or prolong immunity, but does not pertain to the initial process of introducing the modified disease organism. Thus, vaccination most accurately describes the process outlined in the question.