<prompt> The most predominant type of polio virus during epidemics is -Type IType IIType IIICombined infection of II III  <response>: 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 