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HIV Window Period: What You Need to Know

The HIV window period is a critical concept for anyone who has had a high-risk exposure and is worried about HIV infection. Simply put, the window period is the time between when you are infected with HIV and when a test can detect the virus or its markers (antibodies, antigens) in your body. During this time, you may have HIV in your body and be able to transmit it to others, but your test result will be negative — this is called a “false negative.”

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Why can HIV be transmitted during the window period?

During the window period, the HIV virus is already present in the infected person’s body. Unprotected sexual contact with this individual can still lead to HIV transmission.

However, because the infection is recent, the markers the test looks for (such as antibodies) have not yet reached detectable levels. This can result in a false negative result. That is why doctors recommend testing after the window period to confirm infection status.

Transmission risk during this stage is relatively lower, mainly because viral load is typically still low in the early window period, making the infection less contagious.