The most predominant type of polio virus during epidemics is -
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
Type I
Type II
Type III
Combined infection of II & III
Communicable diseases