Which term best describes a preparation used to stimulate immunity by introducing killed or attenuated organisms?

Which term best describes a preparation used to stimulate immunity by introducing killed or attenuated organisms?

• A. Polysaccharide
• B. Vaccine
• C. Toxoid
• D. Anaphylaxis

Answer: (B)

A vaccine is a preparation designed to train the immune system to recognize and fight off pathogens without causing disease. When a vaccine uses killed organisms or organisms that have been attenuated (weakened), it presents the immune system with real pathogen antigens in a safe form, prompting the development of memory B and T cells so protection is ready if exposure occurs later. Toxoids are a kind of vaccine too, but they specifically use inactivated toxins to protect against diseases caused by toxin effects; they’re not about introducing killed or attenuated whole organisms. Polysaccharide describes a type of antigen component some vaccines use, particularly for capsule-based pathogens, but it isn’t the general term for the entire immunization preparation. Anaphylaxis, on the other hand, is a severe allergic reaction and not related to how vaccines are defined. So, the term that best fits a preparation that stimulates immunity by introducing killed or attenuated organisms is vaccine.

A vaccine is a preparation designed to train the immune system to recognize and fight off pathogens without causing disease. When a vaccine uses killed organisms or organisms that have been attenuated (weakened), it presents the immune system with real pathogen antigens in a safe form, prompting the development of memory B and T cells so protection is ready if exposure occurs later.

Toxoids are a kind of vaccine too, but they specifically use inactivated toxins to protect against diseases caused by toxin effects; they’re not about introducing killed or attenuated whole organisms. Polysaccharide describes a type of antigen component some vaccines use, particularly for capsule-based pathogens, but it isn’t the general term for the entire immunization preparation. Anaphylaxis, on the other hand, is a severe allergic reaction and not related to how vaccines are defined.

So, the term that best fits a preparation that stimulates immunity by introducing killed or attenuated organisms is vaccine.