Don't they test the blood first or the person giving it? It's mandatory here.
If you’re thinking about donating blood but are not sure about your HIV status, you can request an HIV test in advance of donating at your local clinic.
They are supposed to, but keep in mind it is a different country in another part of the world.
Do you mean from legitimate licensed blood banks, or from drug addicts sharing needles?
In licensed blood banks, very rarely. The donor suicide.
I did not know.