Social & Preventive Medicine Trivalent oral polio vaccine contains, type 3 virus: A 300,000 TCID 50 B 200,000 TCID 50 C 100,000 TCID 50 D 400,000 TCID 50 💡 Explanation Trivalent oral polio vaccine contains, type 3 virus: ✓ Correct Answer: A. 300,000 TCID 50