Experimental COVID-19 vaccine is put to its biggest test

(AP) – The biggest test yet of an experimental COVID-19 vaccine got underway Monday with the first of some 30,000 Americans rolling up their sleeves to receive shots created by the U.S. government as part of the all-out global race to stop the outbreak.

Final-stage testing of the vaccine, developed by the National Institutes of Health and Moderna Inc., began with volunteers at various U.S. sites given either a real shot or a dummy without being told which.

It will be months before results trickle in, and there is no guarantee the vaccine will ultimately work against the scourge that has killed about 650,000 people around the world, including almost 150,000 in the U.S.

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