this post was submitted on 15 Sep 2024
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Do they not just... test the blood before they use it anyway? You'd think they'd want to do that regardless
They do, but HIV infections can take a while to turn up positive while already being transmittable.
In addition to what @LwL said - It has to do with how testing is done, and that some diseases can't really be tested for. It is quite expensive, and is generally done on small samples from lots of people mixed together. If it is positive they split the batch and test again (look up binary search).
The lower the incidence rate of diseases, the larger batches can be done. Ditching certain denographics with significantly higher risks for certain diseases can make testing orders of magnitudes cheaper and faster. (Other groups, at least where I live, include people who recently changed partner, recently went abroad, have ever gotten a blood transfusion, have gone through a recent surgery, have recently been sick, etc. etc.)
tests have been available since the 1980's; they just don't want gays there.