Just to claify that the risk of catching Polio from the vaccine ( as I understand it) is that it is only from the live vaccine drops (ie the OPV and not the IPV) and the risk is to third party contacts like mothers and grandparents when they change nappies as the live virus is excreted from the body of the infant for about 30 days. So you must always take extra care and wash hands well when changing the nappies of a baby recently vaccinated with the OPV vaccine.
And yes, as I understand it you are right that most cases of polio in the last 30 years or so have been tramsmitted through this route.
Also to note that most cases of polio are no worse than a bad cold and do not lead to paralysis in any way.
They also changed the deffinition of polio when they brought in the vaccine.
BEFORE the vaccine polio was diagnosed as having some form of paralysis in two examinations at least 24 hours apart.
AFTER the vaccine was introduced in 1955 the diagnosis of polio required some form of continuing paralysis 50 - 70 DAYS after the onset.
No wonder the number of cases of polio dropped.
Nowadays people who would previously have been diagnosed with polio are now diagnosed with Viral or aseptic meningitis, Guillaine Barre Syndrome (GBS), Chronic Fatigue syndrome (CFS), Myalgic Encephalitis (ME) or a host of similar afflictions.
Hasn't the oral polio vaccine (OPV) been eradicated from the U.S. years ago, or are they still using it here?