Why is it so much harder to develop an HIV/AIDS vaccine than a COVID-19 vaccine?

COVID-19 vaccines have been developed at speed, but there are difficulties facing the development of an effective vaccine against HIV/AIDS.

There are unique difficulties facing the development of an effective vaccine against HIV/AIDS. Image: REUTERS/Hannah McKay

Ronald C. Desrosiers
Professor of Pathology, Vice-chair for Research, University of Miami
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