Preventive measures for Aids

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I am just wanting to know all of the preventive measures for Aids and other STD's. If you can then please list a site link or tips that would help in prevention. My friends son has just found out that he has Aids and he is terrified that he will give it to someone else. He has already called everyone, with the help of his mother, that he might have had contact with sense he contracted it. He is just wanting to make sure that he does not give it to someone else.