RT [@AJEnglish](https://twitter.com/AJEnglish/status/1353836294128824327) Merck pulls plug on two potential COVID vaccines following poor test results https://t.co/coQU619f8V https://t.co/EqLAoLQ9YG
Merck pulls plug on two potential COVID vaccines following poor test results https://t.co/coQU619f8V pic.twitter.com/EqLAoLQ9YG
— Al Jazeera English (@AJEnglish) January 25, 2021
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