How long does it take HIV infection to show up on a blood test? And how soon can he give it to someone else?

Example: If a man sleeps with a woman who has HIV on Jan 1, 2006, and he gets HIV from her, how long will it take to test positive?

Also, let's say he sleeps with a girl that does not have it the next day. Can he spread it already?

For dollarboy - I am not currently worried about myself having it, I just was watching too many talk shows lately.

You can transmit it instantly.
It is testable within a week a believe.
HIV can be dormant for as long as 10 years before attacking your body.

You can not transmit it instantly. It typically takes several days to a couple weeks from exposure to build up enough viral load to be highly contagious. It is often testable with a PCR viral load test within a week but not with high (99%) reliability until three to four weeks. Report It

did u give ur boyfriend HIV or did he give it to u?

you should get tested every six months and i am not sure if he can spread it very soon after infection. i would ask a health professional and get tested every six months. p.s. there is a fast strain that shows up sooner and goes from hiv to aids in under three years.