Quite quickly. In fact the signs of infection can appear anywhere between 2-12 days after exposure to the virus. Keep in mind however that over 60 percent of HSV2 (genital herpes) infections will not produce symptoms. The only way to be completely certain is to request a blood test.
If you'd like to know more about genital herpes visit Healthcentral's own Herpes site. This link takes you to an article relating to herpes symptoms.
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