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2002 SEP 4 - (NewsRx.com & NewsRx.net) -- by Maria G. Essig, MS, ELS, senior medical writer - A mutated strain of poliovirus derived from the Sabin vaccine strain caused paralytic poliomyelitis in a baby who possessed a competent immune system.
"Successful implementation of the global poliomyelitis eradication program raises the problem of vaccination against poliomyelitis in the posteradication era," explained Elena A. Cherkasova and her colleagues at Moscow State University and the U.S. Food and Drug Administration in Rockville, Maryland. "One of the options under consideration envisions completely stopping worldwide the use of the Sabin vaccine."
However, Cherkasova and her associates warn that this approach is a safe and effective one only if wide circulation of the vaccine strain does not occur. This assumption has been thrown into doubt by a case of paralytic polio found in a 7-month-old baby who possessed an intact immune system and lived in an area of adequate immunization coverage.
The virulent virus developed from the Sabin vaccine strain and, upon examination, was found to be a double (type 1-type 2-type 1) recombinant (Long-term circulation of vaccine-derived poliovirus that causes paralytic disease. Journal of Virology, 2002;76(13):6791-6799).
"The number of mutations accumulated in both the type 1-derived and type 2-derived portions of the recombinant genome suggests that both had diverged from their vaccine ...
Source: HighBeam Research, Virulent poliovirus causes paralysis in baby.(Brief Article)