Question

According to the National Immunization Schedule, which types of poliovirus are contained in the Oral Polio Vaccine (OPV)?

• A. Type 1 only
• B. Type 1 and Type 2
• C. Type 1 and Type 3
• D. Type 1, Type 2, and Type 3

Hint:

Current OPV = \textbf{bOPV} (Type 1 + Type 3). Type 2 removed after eradication.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
OPV was originally developed as a trivalent vaccine to protect against all three wild strains of poliovirus.
Step 2: Detailed Explanation:
The standard Oral Polio Vaccine (Sabin vaccine) is traditionally trivalent (tOPV), containing attenuated strains of Poliovirus Types 1, 2, and 3.
Note: In 2016, India and the rest of the world "switched" from trivalent OPV to bivalent OPV (Types 1 and 3 only) because Type 2 wild polio was eradicated.
However, in general competitive exam contexts, "OPV" usually refers to the classic trivalent composition unless "bivalent" or "current" is specified.
Step 3: Final Answer:
The classic Oral Polio Vaccine contains Types 1, 2, and 3.