Urgent polio boosters for London children - BBC News
Jason Crawford on Twitter: "Myth: polio was already declining before the introduction of the polio vaccine in 1955 Fact: the epidemics were actually getting worse https://t.co/MYSkeT1et7 https://t.co/VNSM3ngpp3" / Twitter
Polio Elimination in the United States
How India managed to defeat polio - BBC News
File:Reported paralytic polio cases and deaths in the United States since 1910, OWID.svg - Wikimedia Commons