Four Covid jabs’ efficacy results were released less than a year after the trials had started. But this is far from the norm. Researchers have been working on HIV vaccines for more than three decades — and we still don’t have one. Here’s why.
Researchers have been working on HIV vaccines for more than three decades. (Photo: theconversation.com / Wikipedia)
Covid-19 has forced the world to find ways to develop vaccines rapidly, compressi…
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