On July 10th, I had unprotected vaginal intercourse with a average European woman while I was in a relationship. I have since informed my partner, and she has chosen to forgive me. Following that incident, we have had protected intercourse using condoms 5–6 times between then and August 4th, when I underwent a NAAT test for Chlamydia. The test came back negative. There were no condom failures that I noticed, and I have not experienced any symptoms. I have a few questions I hope you can help clarify: Chlamydia Testing: Can I rely on the negative NAAT result to confirm that I did not contract Chlamydia, or is it possible that I had a short-term infection that cleared naturally within the 24-day window before testing? Condom Effectiveness: If I did have Chlamydia and it cleared before the test, how effective would condom use have been in protecting my partner during our intercourse? Partner Testing: Given the situation, should my girlfriend also get tested for Chlamydia? Other STIs: Is testing for HIV or syphilis recommended in this case? If so, is it correct that the most reliable results would come from testing at 90 days post-exposure? Thank you very much for your time and guidance.