[fretzer]

could be this

https://www.livescience.com/australia-covid-19-vaccine-false-positive-hiv-tests.html

[Caipirabob]

The live science article also explains; “It's important to note that there is no way for the vaccine to cause an HIV infection, because it contains harmless fragments of the virus.”

The explanation being that the vaccine includes parts of the HIV protein, but not those identified as triggering full blown aids. The body still can produce antibodies to the proteins, triggering a false positive on tests. This being the specific reason that the totalitarian fascist Australian government cancelled 51 million doses of that batch of the vaccine.