Thank's for your answer. I have an unprotected sex with a girl in Eritrea on 29 Nov 2012. I already underwent an ELFA test on February 25 2013 (88 days after exposure) and the result is "Non Reactive", also an imunochromatograf test on May 9, ELISA test on 11 May, and also it coming "Non Reactive". But there is still a lot symptoms appear on my body, like skin rashes, swollen lymph nodes, fatigue etc. What is the diference between ELISA and ELFA?