Epidemic of polio is due to -: (A) Type I virus, (B) Type II virus, (C) Type III virus, (D) Combine type II and III virus
Answer is A. Poliovirus tyoe 1 is responsible for most epidemics of paralytic poliomyelitis. Type 3 also causes but to a lesser extent. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:490