When a person tests positive for HIV it is not a test for the virus itself but for antibodies to the virus and the test is not able to distinguish between HIV antibodies and a multitude of other antibodies. Many conditions can lead to a false positive result including flu shots hepatitis and pregnancy.
What's happened with society is that we have created these devices computers which already can register and process huge amounts of information which is a significant fraction of the amount of information that human beings themselves as a species can process.