Editorial: Just one case of polio is a global threat

Polio - Wikipedia

Polio is back: National incident declared in UK as disease spreads for first time in nearly 40 years

Pakistan reports polio case to take year's count to 13

How Long Does the Polio Vaccine Last and Do You Need a Booster?

Resurgence of Wild Poliovirus Type 1 Transmission and Consequences of Importation --- 21 Countries, 2002--2005

Highlight, take notes, and search in the book In this edition, page numbers are just like the physical edition

Polio: An American Story

Polio Vaccination Causes More Infections than Wild Virus

How Polio Crept Back Into the U.S. — ProPublica

What Is a 'Vaccine-Derived' Poliovirus?