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By Ania Lichtarowicz Health reporter, BBC News
A new vaccine against the polio virus has helped reduce the number of cases by more than 90%.
Research published online in the journal The Lancet, shows that the new vaccine is significantly better at protecting children against polio than the current popular vaccine.
It has already been used in Afghanistan, India and Nigeria.
The scientists behind the work believe this new vaccine could help to finally eradicate the disease.
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