If you recall the immunisation drives of the 1950s and 60s, you probably remember the school assembly hall, queuing alongside your classmates, a nurse in starched linen, and swallowing the vaccine on a sugar-lump.

Today, the polio vaccination effort is very different. We’ve beaten the virus back to just a few of the world’s most hard-to-reach places, which brings a new set of challenges. In regions where it’s extremely difficult to set up conventional vaccination programmes, millions of courageous local health workers have taken up the challenge to deliver the vaccine to vulnerable children by foot. By bike. By boat. By helicopter. By donkey. By whatever means possible.

These volunteers are the unsung heroes and now, on the 60th anniversary of Jonas Salk’s polio vaccine being declared safe and effective, they’re on the verge of wiping out polio forever.

Because the virus can’t survive outside the human body for long it can, unlike most diseases, be eradicated. The vaccine costs as little as 9p per dose. So it’s now a race between the virus and the volunteers.

Volunteers travel for days to reach remote villages, braving hazardous terrain and unpredictable conditions. For example, in northern Nigeria, it takes a five-day camel trek to get vaccines to some communities. Even when faced with impossible conditions, they refuse to give up. In September 2014, polio workers across West and Central Africa immunized an astonishing 94 million children in just one week. And when flash-floods destroyed bridges and roads in the Indian state of Bihar, workers waded waist-deep to bring vaccines to at-risk areas.

The virus that caused panic when we were young — striking healthy children without warning—could soon be joining smallpox in the history books.

But polio, despite those memories of the 50s and 60s, hasn’t entirely gone away. It’s just that no-one is talking about it.

We need One Last Push to wipe it out once and for all.

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