It is possible to test negative for HIV antibodies during the first six months after contraction of and yet actually have virus?

Yes, it is possible to test negative for HIV antibodies during the first six months after contracting HIV and still have the virus. This period is known as the "window period" or "seroconversion period".

When someone is infected with HIV, it usually takes several weeks to several months for the body to produce detectable levels of antibodies against the virus. During this time, the person may be infected with HIV and able to transmit the virus to others, but they will test negative for HIV antibodies.

The window period can vary in length from person to person, but it typically lasts for about 6 months. However, in some cases, the window period can last for up to 12 months or longer.

For this reason, it is important to practice safe sex and get tested for HIV regularly, especially if you have engaged in high-risk activities such as unprotected sex or sharing needles. If you test negative for HIV antibodies but are concerned that you may have been infected with HIV, you should talk to your doctor about additional testing options, such as a viral load test.