This happens a lot: 1) STDs are not always transmitted. If one partner has chlamydia, the transmission chance is ~50% for unprotected vaginal sex, so after 1 exposure, only half of partners will catch it. 2) Spontaneous cure in one person before being tested. 3) Partner got treated and didn't admit it. 4) Test missed it; chlamydia tests miss 5-10% of infections. 5) Some people may be immune after past infection.
Answered 12/3/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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