All of the following statements are true regarding poliovirus except -: (A) It is transmitted by feco-oral route, (B) Asymptomatic infections are common in children, (C) There is a single serotype causing infection, (D) Live attenuated vaccine produces herd immunity
Answer is C. Poliovirus strains are classified into 3 types-1,2 and 3. TYPE 1 most common. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:486