Jeffrey Mphahlele

A volunteer receives an injection from a medical worker during the country’s first human clinical trial for a potential vaccine against COVID-19 in Soweto, South Africa. Felix Dlangamandla/Beeld/Gallo Images via Getty Images

COVID‑19 vaccine: the challenges of running a trial in the middle of a pandemic

In a pandemic like this one, the priority is to save lives. But without a vaccine, there’s a limit in the tools available to save lives.

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