What does the 'window period' refer to in the context of HIV infection?

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The interval between initial infection and the point when antibodies to the virus become detectableThe duration from HIV infection until the onset of AIDS symptomsThe time taken from sample collection to identifying the virus in laboratory testsNone of the above

Explanation

The window period is the time span between when a person is infected with HIV and when the antibodies against the virus can be detected in their blood. During this phase, tests may not yet show a positive result even though the person is infected.