Multiple choice

Polio immunising vaccine was developed by

  1. E. Jenner

  2. Dr. Salk

  3. St. Hale

  4. Landsteiner

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Dr. Jonas Salk developed the first successful polio vaccine in 1955. His inactivated polio vaccine (IPV) was administered by injection and proved highly effective in preventing paralytic poliomyelitis, leading to a dramatic decline in polio cases worldwide.