El brote afectó a dos docenas de niños en ambos países entre los años 2000 y 2001, y tuvo su origen en la inmunización de un niño entre 1998 y 1999.
Aunque se estima que la vacuna oral contra la polio, que contiene virus vivos atenuados, es muy efectiva, en raras ocasiones puede causar la enfermedad por sí misma. Por este motivo, algunos países han establecido el uso de la vacuna inyectada.
Webs Relacionadas
Science
http://www.sciencemag.org/
CDC
http://www.cdc.gov/
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