Which of the following regarding oral polio vaccine (OPV) is not true?
Excretion of virus in stools provides immunity to unimmunized (Herd Immunity) OPV or Sabin type vaccine: Live attenuated Given orally Immunity is both humoral and intestinal Induces antibodies quickly Prevents not only paralysis, but also intestinal reinfection Can be effectively used in controlling epidemics (herd immunity); Even a single dose elicits substantial immunity. Easy to manufacture Cheaper Required to be stored & transpoed at sub zero temperatures, unless stabilized