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Are you still in the 1980’s mentality where you think you can get Aids by being around someone with AIDS.

Well, no, but speaking for myself, I'm in the 21st century mentality that I can pay for AIDS treatment for non-Americans and worry about the quality of blood transfusions that will be available when I or my family members need therm

Well, no, but speaking for myself, I'm in the 21st century mentality that I can pay for AIDS treatment for non-Americans..

That is the real issue here. But then again, that's no reason to e.g. keep a Italian businessman or a British tourist (who get their pills at home and stay for 3 days or two weeks) out of the coutry. Especially given the fact that HIV prevalence is much higher in the US than e.g. in most of Europe.

... and worry about the quality of blood transfusions that will be available when I or my family members need therm.

The problem here is not tourists - they usually never donate blood (or there could be rules against foreign tourists donating blood, there probably are already). Plus: blood donations are being screened so even a psychopath would have to expect being caught and embarrassed.

The real problem here is people who don't know they have it yet, who live a more promiscuous life than would be advisable if you want to give blood, yet still do so because of social pressure (company blood drive etc.). But even in that case screening works (in 99.999% of the cases).