Social & Preventive Medicine . True about polio is all except: A Sabin vaccine is attenuated, oral vaccine B Salk is a killed formalized vaccine used C Vaccine induced polio is usually due to Type 2 virus D Most common type of virus in epidemics is Type 1 💡 Explanation . True about polio is all except: ✓ Correct Answer: C. Vaccine induced polio is usually due to Type 2 virus