The move will see the existing vaccine swapped out for a different one
Global health experts are hoping to eradicate polio by swapping the vaccine that's used to fight the disease.
According to the BBC, there have been 74 cases of the paralysing disease in 2015, while the World Health Organisation says there have only been 12 cases worldwide this year, all of which were in Pakistan and Afghanistan.
From today, 150 countries will start using the different vaccine to try to wipe out the virus completely.
The new vaccine will no longer contain a weakened version of type 2 polio virus, which was eradicated in 1999, but it will still be given in the form of drops, meaning that medical staff in the regions will not need any training.