If properly worn and used before any genital inter-contact, yes. Pre-ejaculate and other bodily fluids can harbor STDs, although infection (or pregnancy) is far more likely to occur from unprotected sexual intercourse.
Through blood transfusion
You can prevent HIV by using condoms and tell your partner to go see a Clinic and take the HIV -antibody test.
Other than stimulating research into the functioning of the human immune system, HIV is not beneficial in any way.
ANSWER: Currently, there are NO vaccines that can prevent HIV or the HIV virus, but there AREvaccines that can prevent Hep. C.I hope this will help answer your question!
Circumcision does NOT prevent HIV and AIDS.
You prevent aids by not getting infected by HIV. HIV is spread through body fluids. Avoiding sexual contact and contact with blood through sharing needles and transfusions can go a long way toward preventing it.
Don't have unprotected sex and don't share a needle with someone who's HIV positive.
pray
There is no commercially available HIV vaccine as of 2014.
There is no cure for HIV. If there were a cure, that would also prevent transmission.
refrain from any sexual contact (kissing is okay so is holding hands, hugging and other casual physical contact) or in other words NO SEX you may think that a condom will prevent that but it wont 95% of the time
Having unprotected sex with an HIV infected person is a common way that HIV is transmitted.