- You and your partner have been practicing safe sex for since the beginning of your sexual relationship two months ago. You both agree to an HIV test, and the results are negative for both of you. How will this influence your behavior? The ELISA that you received detects the presence or absence of antibodies against HIV. Antibodies can take one to six months to develop after exposure to HIV. During this time between exposure and antibody production the virus can reproduce rapidly and the amount of virus present in body fluids is high. How does this information influence your behavior?