Is it OK to mix and match COVID-19 vaccines? Oxford researchers begin trial.

Is it OK to mix and match COVID-19 vaccines? Oxford researchers begin trial.

Is it OK to mix and match COVID-19 vaccines? Oxford researchers begin trial.

Amid a shortage of vaccine supplies and the threat of emerging coronavirus variants, such an approach might provide an answer for both.
Is it OK to mix and match COVID-19 vaccines? Oxford researchers begin trial.