In a major setback US pharma giant Merck has announced that it will stop making its COVID-19 vaccines after failed clinical trials to generate a strong immune response.
US pharma giant Merck has scrapped two coronavirus vaccine candidates after they failed to produce an adequate immune response in early trials, the company announced Monday.
The results were "disappointing, and a bit of a surprise," Nick Kartsonis, senior vice president of clinical research for infectious diseases...
