I was wondering what the accuracy of a 15 day fourth generation elisa test is and a third generation elisa test done at 21 days, both which have come back negative. Also, worth noting is that i feel like my throat is dry and is closing on me all the time. No fever, rash, swollen lymph nodes, etc... (at 29 days since exposure now) Encounter: Unprotected oral and protected sex, she may have rubbed her groin on mine but no penetration.