Which statement correctly identifies inactivated vaccines?

Which statement correctly identifies inactivated vaccines?

• A. Live attenuated vaccines
• B. Inactivated vaccines
• C. Subunit vaccines
• D. Toxoid vaccines

Answer: (B)

Inactivated vaccines are made by killing the pathogen so it cannot replicate in the body. Because there’s no replication, they cannot cause disease, which makes them safer for people who are immunocompromised. However, since the pathogen doesn’t multiply, the immune response is typically weaker and mainly antibody-focused, so these vaccines usually require multiple doses and often an adjuvant to boost the response. This distinguishes them from live attenuated vaccines, which use a weakened form that can replicate and often elicit stronger, broader immunity including cellular responses. They also differ from subunit vaccines, which use only specific proteins or fragments, and from toxoid vaccines, which use inactivated toxins to provoke neutralizing antibodies. Examples of inactivated vaccines include the inactivated polio vaccine, hepatitis A vaccine, and certain influenza vaccines.

Inactivated vaccines are made by killing the pathogen so it cannot replicate in the body. Because there’s no replication, they cannot cause disease, which makes them safer for people who are immunocompromised. However, since the pathogen doesn’t multiply, the immune response is typically weaker and mainly antibody-focused, so these vaccines usually require multiple doses and often an adjuvant to boost the response. This distinguishes them from live attenuated vaccines, which use a weakened form that can replicate and often elicit stronger, broader immunity including cellular responses. They also differ from subunit vaccines, which use only specific proteins or fragments, and from toxoid vaccines, which use inactivated toxins to provoke neutralizing antibodies. Examples of inactivated vaccines include the inactivated polio vaccine, hepatitis A vaccine, and certain influenza vaccines.