A clinical trial gives hope that the right vaccination scheme could eradicate polio worldwide by 2018. Another study, though, warns that mutated viruses could jeopardize that goal. The crippling and potentially fatal disease polio, caused by a virus, is almost eradicated – but only “almost”.

It still persists in remote or conflict-ridden areas of Nigeria, Pakistan and Afghanistan. From there, travelers can take the virus to other countries and infect unvaccinated people. The Global Polio Eradication Initiative, spearheaded by national governments and the World Health Organization among others, has set the target of wiping out polio completely by 2018.

Vaccination is the key to reaching this goal. But scientists have been debating for more than 50 years which kind of vaccination is the most suitable. A new clinical trial suggests the answer could lie in a combination of both.

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