Which is an example of a live attenuated vaccine?

Which is an example of a live attenuated vaccine?

• A. MMR vaccine
• B. Diphtheria toxoid vaccine
• C. Polio inactivated vaccine
• D. Hepatitis B vaccine

Answer: (A)

Live attenuated vaccines use weakened forms of pathogens that can still replicate in the body, which stimulates a strong and lasting immune response similar to natural infection. The MMR vaccine fits this approach because it contains live, weakened measles, mumps, and rubella viruses that can replicate just enough to provoke immunity. In contrast, the diphtheria toxoid vaccine is made from inactivated toxin to train the immune system, the polio vaccine here is inactivated (killed) and cannot replicate, and the hepatitis B vaccine is a recombinant protein vaccine with no live virus. So, the MMR vaccine is the example of a live attenuated vaccine.

Live attenuated vaccines use weakened forms of pathogens that can still replicate in the body, which stimulates a strong and lasting immune response similar to natural infection. The MMR vaccine fits this approach because it contains live, weakened measles, mumps, and rubella viruses that can replicate just enough to provoke immunity. In contrast, the diphtheria toxoid vaccine is made from inactivated toxin to train the immune system, the polio vaccine here is inactivated (killed) and cannot replicate, and the hepatitis B vaccine is a recombinant protein vaccine with no live virus. So, the MMR vaccine is the example of a live attenuated vaccine.