What's HIV got to do with a coronavirus vaccine?

It was one of the four vaccines that the Australian Government had pinned its hopes on, but on Friday we heard the University of Queensland vaccine had been canned. The vaccine had shown promising results in early trials and was deemed safe, but its downfall was that it caused recipients to have a false positive for HIV. So if the shot was safe and effective, and the HIV link was a false positive, then why was the whole vaccine scrapped?

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