Not known: The longest time from std chlamydia exposure until it shows up in a lab test is not known; because everybody is different, everyone contacts a different number of germs, people's memories of events are not that accurate, each test type is different, tests are not 100% accurate, etc... If a person is, for example, negative at 2 weeks and at 2 months, but positive later, it's likely a new infection.
Answered 7/9/2019
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