Was polio vaccine given orally?
Score: 4.2/5 (38 votes) Polio vaccine has been available since 1955. The inactivated polio vaccine (IPV) was available first, given as a shot, in 1955. A more convenient form, called oral polio vaccine (OPV), was given as liquid drops via the mouth. It was developed in 1961.Why did they stop using o...