The most predominant type of polio virus during epidemics is -: (A) Type I, (B) Type II, (C) Type III, (D) Combined infection of II & III
Answer is A. Polio virus has three serotypes 1,2 and 3. Most outbreaks of paralytic polio are due to type-1 virus. Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page :205