Polio Home > Vaccine-Associated Paralytic Poliomyelitis
- 41 percent occurred in healthy vaccine recipients (average age: three months)
- 31 percent occurred in healthy contacts of vaccine recipients (average age: 26 years)
- 5 percent were community acquired (i.e., vaccine virus was recovered but there was no known contact with a vaccine recipient)
- 24 percent of vaccine-associated paralytic poliomyelitis cases occurred in people with immune system problems.