Fact: It may surprise you, but many people who have herpes don't know it. In fact, the Centers for Disease Control and Prevention estimates that more than 750,000 people are infected with herpes every year! Herpes symptoms can lie dormant for weeks before an outbreak occurs. So even if your partner looks and feels healthy, they could be infected and pass the herpes virus to you. Only an STD test that screens for herpes can tell you for sure whether you have it or not. Be smart - get tested and ask your partner to get tested too.