Genital herpes is a contagious viral infection that affects an estimated 45 million Americans (more than one in five). Each year, as many as 1 million new cases are believed to occur. The infection is caused by the herpes simplex virus (HSV). There are two types of HSV and both can cause the symptoms of genital herpes. HSV type 1 most commonly causes sores on the lips (known as fever blisters or cold sores), but it can cause genital infections as well. HSV type 2 most often causes genital sores, but it also can infect the mouth. The virus remains in certain nerve cells of the body for life, causing periodic symptoms in some people. Many people who are infected with HSV never develop any symptoms.
How is genital herpes transmitted?
The infection is usually acquired by sexual contact with someone who has genital herpes. People with oral herpes can transmit the infection to the genital area of a partner during oral-genital sex. Herpes infections also can be transmitted by a person who is infected with HSV but has no noticeable symptoms. Such asymptomatic shedding of the virus may be fairly common, occurring from 5 percent to 20 percent of the time in infected individuals.
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