Key result
Surveillance of >9000 cases of acute flaccid paralysis in the Americas since August 1991 identified 0 cases of wild poliovirus, resulting in the region being declared polio-free.
Population
Cases of acute flaccid paralysis in the Americas (Western Hemisphere)
Design
Other
Follow-up
1988-1995
Authors
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Marks Americas' wild poliovirus eradication; extends surveillance evidence for global eradication programs.
Observational (n=9,000)
Yes
The Americas were declared polio-free in 1994 following extensive surveillance showing no wild poliovirus cases since 1991.
Quadrós et al. (1997) conducted an observational in Poliomyelitis (n=9,000). Acute flaccid paralysis surveillance was evaluated on Confirmed paralytic poliomyelitis due to wild poliovirus. Surveillance of >9000 cases of acute flaccid paralysis in the Americas since August 1991 identified 0 cases of wild poliovirus, resulting in the region being declared polio-free.
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