Anti-vaxxers are so ignorant.
https://en.wikipedia.org/wiki/Albert_Sabin
Sabin developed an oral vaccine based on mutant strains of polio virus that seemed to stimulate antibody production but not to cause paralysis. Recipients of his live attenuated oral vaccine included himself, family, and colleagues....
Between 1955 and 1961, the oral vaccine was tested on at least 100 million people in the USSR, parts of Eastern Europe, Singapore, Mexico, and the Netherlands....
Sabin refused to patent his vaccine, waiving commercial exploitation by pharmaceutical industries, so that the low price would guarantee a more extensive spread of the treatment. From the development of his vaccine Sabin did not gain a penny, and continued to live on his salary as a professor. The Sabin Vaccine Institute was founded in 1993 to continue the work of developing and promoting vaccines