Outbreaks of Polio
Polio is an infectious disease caused by a virus that can spread from person to person or through contaminated water or food. Many people who are infected don’t feel sick or have symptoms. Some people have only minor symptoms such as fever, nausea, headache, nasal congestion, sore throat, cough, stiffness in the neck and back, and pain in the arms and legs. A small proportion of those with symptoms develop paralysis.