When you donate blood, it is tested for HIV and other infections to make sure it is safe for others to receive. This kind of testing is why the blood supply of the U.S. and other developed countries is so safe. Any blood found to be unhealthy in some way is not used. Also, you cannot get infected with HIV from donating blood. If you want to be sure of your HIV status, the best way to find out is not by donating blood but by getting an HIV test. The results from HIV testing are timelier and a provider can link you to the right kind of care and resources if you do test positive.
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