Which of the following is an example of a subunit vaccine?
- Smallpox vaccine
- Hepatitis B vaccine
- MMR vaccine
Yellow fever vaccine
The Correct Option is B
Solution and Explanation
Step 1: Understanding subunit vaccines. - Subunit vaccines contain only specific pieces of the pathogen, such as proteins or polysaccharides, rather than the whole microorganism. - They generate an immune response without introducing live or inactivated pathogens.
Step 2: Explanation of incorrect options.
- Smallpox vaccine (A): A live attenuated vaccine containing live vaccinia virus.
- MMR vaccine (C): A live attenuated vaccine containing weakened measles, mumps, and rubella viruses.
- Yellow fever vaccine (D): A live attenuated vaccine containing a weakened yellow fever virus.
Step 3: Selecting the correct option. - Hepatitis B vaccine is a subunit vaccine that contains the hepatitis B surface antigen (HBsAg) to stimulate immunity without introducing the whole virus. Thus, the correct answer is (B) Hepatitis B vaccine.
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