For me titles are either a natural two-second experience or stressful enough to give you an ulcer. If they don't pop out perfect on the first try they can be really hard to repair. Or worse if the author thinks they pop out perfect but the publishing house does not agree it's difficult to shift gears. And then? Then you go insane.
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.