A rumor of vaccinated children falling sick in a village school has triggered panic and violence across Pakistan and brought polio vaccination drives to a halt.
There has been a greater than 99.9 per cent drop in the number of cases since 1988, when the Global Polio Eradication Initiative was launched and 1,000 children worldwide were being paralysed by the disease every day.
Eradicating measles would save 22 million lives by 2030, but to succeed, we might need to learn how to eradicate other diseases first.
An infectious disease is considered eliminated from a geographical region if new cases in the region drop to zero, but with travel eliminated diseases can be reintroduced.
Three years of no cases with high-quality surveillance are required for an eradication certification.
Guinea worm eradication is now possibly several years away due to a major setback in Chad.