Polio is an infectious disease with high transmissibility. It is mostly caught by young children below five years, and in 0.5% of cases, it results in permanent paralysis. In up to a tenth of those who become paralyzed, death occurs. Polio spreads via the feco-oral route but uncommonly via contaminated food or water. Notably, over 90% of infections are asymptomatic or very mild. In symptomatic cases, the virus replicates in the gut and then enters the nerves. After an incubation period of 7-10 days (though this may stretch up to 35 days), it presents initially with fever, tiredness, vomiting, neck stiffness, and limb pain due to gut infection and, later, aseptic meningitis. View More