Yes. The window period between exposure and testing positive for HIV is seen as the most infectious timeframe. Just because your body is not yet producing antibodies to the virus does not mean that infection cannot occur. During this time, your body is rapidly producing the HIV virus.

No they do not...and good luck with HIV test

If your HIV test result was negative, and you've had no new risky exposures since the test, and if you are not in the window period, you can consider yourself free from HIV. The window period the time between infection with HIV and the time when the test will become positive.

yes

The term incubation is not generally used in reference to HIV infection. However, there is a period of time when someone can be infected with the virus and test negative.

The "window period" refers to the period of time between when someone is infected with HIV until they can test positive. The "window period" is anywhere between 28 and 90 days after infection.

The "window period" occurs because the standard HIV tests detect anitbodies that occur as a result of HIV infection. Antibodies are not immediately detectable after infection.