The National Institutes of Health has stopped its HVTN 702 trial, of more than 5,000 people in South Africa, as it found the jab did not prevent HIV.

Experts expressed “deep disappointment” but added the search for a preventive HIV vaccine must continue.

Such vaccines do not contain HIV and therefore do not pose any danger of giving HIV to an individual.

What was the vaccine?

The jab was a new version of the first HIV-vaccine candidate shown to provide some protection against the virus – in the RV144 clinical trial, in Thailand.

There are many different strains of HIV and the vaccine had been adapted to the subtype most common is South Africa, which has one of the highest HIV rates in the world.

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There were great hopes that the vaccine would work and it could then be adapted to cover other strains of HIV circulating in other parts of the world.

What happened in the trial?

Volunteers were randomly assigned to receive either the vaccine or placebo injections.

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And preliminary data showed:

  • 129 HIV infections among the vaccine recipients
  • 123 HIV infections among those given the dummy jab

Dr Anthony Fauci, from the NIH, said: “An HIV vaccine is essential to end the global pandemic and we hoped this vaccine candidate would work. Regrettably, it does not.”

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“Research continues on other approaches to a safe and effective HIV vaccine, which I still believe can be achieved.”

Linda-Gail Bekker from the International Aids Society said: “Whilst this is a significant setback for the field, we need to continue the quest for a preventive vaccine.”

There is still hope other HIV vaccines in development may work.