<prompt> All of the following statements are true regarding poliovirus except -It is transmitted by feco-oral routeAsymptomatic infections are common in childrenThere is a single serotype causing infectionLive attenuated vaccine produces herd immunity  <response>: Poliovirus strains are classified into 3 types-1,2 and 3. TYPE 1 most common. REF:ANANTHANARAYAN AND PANIKERS TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:486 