Abstract
The authors, after a review of some data about the actual poliomyelitis epidemiology in the world, point out the necessity of periodical checks for poliomyelitis vaccination. To this purpose, preliminary data of a research, undertaken in the province of Siena, into the effectiveness and innocuity of oral poliovirus vaccine, are reported. This evaluation has been made through isolation and identification of vaccinal polioviruses from stool after the first, second and then third dose of vaccine, and through titration of serum neutralizing antibodies. Results confirm the high effectiveness and innocuity of oral poliovirus vaccine, but suggest the opportuneness of some changes in the way of giving the oral vaccine.
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