infections
Polio
Symptoms of Polio
Most polio infections cause no symptoms. Only about 25 to 30% of infected people develop any symptoms. Polio infections that do cause symptoms are categorized as Abortive poliomyelitis (mild) Nonparalytic poliomyelitis (serious) Paralytic poliomyelitis (severe) In this mild form of polio, most people have flu-like symptoms such as fever, mild headache, sore throat, vomiting, and a general feeling of illness (malaise). These symptoms develop 3 to 5 days after exposure to the virus. About 4% of people with poliovirus infection have this serious form of polio. They typically develop a stiff neck and/or back and headache ( Viral Meningitis ) several days after the flu-like symptoms of abortive poliomyelitis. The symptoms last 2 to 10 days. People do not develop paralysis. 