Drugmakers GlaxoSmithKline and Sanofi say that their potential COVID-19 vaccine won’t be ready until late next year as they seek to improve the shot’s efficacy in older people.
The companies said Friday that early-stage trials showed the vaccine produced an “insufficient” immune response in older adults, demonstrating the need to refine the product so that it protects people of all ages. They said they now expect the vaccine to be available in the fourth quarter of 2021.
GSK and…
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