Question on Polio Elimination

John Cherwonogrodzky jcherwon at dres.dnd.ca
Thu Dec 14 17:15:21 EST 1995


Dear Colleagues:
    I'm a bacteriologist, not a virologist, so please excuse my ignorance. I 
thought that polio vaccination hasn't eliminated polio. There is still 
virulent polio about but that it has largely been "crowded out" by the vaccine 
strain. The vaccine strain is being shed and is in our water and sewage. There 
may also be a "herd effect" in that vaccinates may indirectly immunize 
non-vaccinates by contamination and by breaking the cycle of the virulent 
strains. Comments?....John



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