The HIV vaccine testing in humans that uses messenger RNA technology has begun, the biotech firm Moderna and the International AIDS Vaccine Initiative said Thursday.

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This Phase 1 trial is being carried out in the United States among 56 healthy adults who are HIV negative.

Despite four decades of research, doctors have yet to develop a vaccine to protect people from the virus that causes AIDS, which kills hundreds of thousands of people around the world each year.

But hopes have been stirred with the success of mRNA technology, which allowed for the development of Covid-19 vaccines in record time, including one from Moderna.