„I can see no hope at present of such a vaccine being produced… I have adopted a frankly defeatist attitude towards the problem of poliomyelitis and I hope that future developments will prove me wrong… No means of controlling poliomyelitis is at present visible.“
— Frank Macfarlane Burnet
Burnet, F.M. (1949) "Some aspects of the epidemiology of poliomyelitis". in: Proc. Royal Australasian College of Physicians. 4: 95-100. Quote from 1949 on the development of a poliomyelitis vaccine, which was developed later that year.