Fatal is claiming the lives of tens of thousands of Americans each year in what experts have described as the 'worst crisis the US has ever faced'.
But it could become a thing of the past thanks to a new vaccine that would be given to high-risk drug users months or possibly years in advance of an overdose.
The vaccine - likely to be administered via several injections - essentially teaches the immune system how to prevent opioids from shutting off oxygen to the brain.
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