Two viruses that cause genital herpes, herpes simplex virus-1 and -2, decreased in prevalence in the United States during the past 2 decades, according to a new study by the Centers for Disease Control and Prevention in Atlanta published in the Aug. 23/30 Journal of the American Medical Association.
Among some 9,000 people tested between 1988 and 1994, 21 percent had been exposed to HSV-2, which is the main cause of genital herpes worldwide.
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