Immunization: You Call the Shots
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 About Poliomyelitis
 About Polio Vaccine
 Indications for Vaccination
 Combination Vaccines
 Contraindications and Precautions to Vaccination
 Use of the VIS, "POLIO VACCINE: What you need to know"
 Vaccine Storage and Handling
 Vaccine Administration
 Adverse Reactions Following Vaccination


About Poliomyelitis

Symptoms of polio vary greatly, but can be classified into four general groups: asymptomatic, minor illness, nonparalytic, and paralytic. Click on each button below to learn more.

This bar chart shows that up to 72% of poliovirus infections in children are asymptomatic, about 24% of polio infections in children consist of a minor, non-specific illness, about 1% to 5% result in nonparalytic aseptic meningitis, and fewer than 1% result in paralysis.
Source: Centers for Disease Control and Prevention

Asymptomatic Minor illness
Nonparalytic Paralytic


Up to 72% of all poliovirus infections in children are asymptomatic.
However, a person with asymptomatic poliovirus infection can still
spread the virus because it is shed in his or her stool.

Learning Opportunity
Click here to read about
cases of poliomyelitis.