Frankfurt — A Covid-19 vaccine developed by German biotech firm BioNTech and US pharmaceutical giant Pfizer has shown potential and was found to be well tolerated in early-stage human trials, the companies said on Wednesday.

The drug is one of 17 being tested on humans in a frantic global race to find a vaccine the world is counting on to end a pandemic that has infected 10.5-million people, with about half of those recovered, and killed more than half a million so far...

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