Results of a recent, nationally representative study show that genital herpes infection is common in the United States. Nationwide, 45 million people ages 12 and older, or one out of five of the total adolescent and adult population, is infected with HSV-2.

HSV-2 infection is more common in women (approximately one out of four women) than in men (almost one out of five). This may be because male to female transmission is more efficient than female to male transmission. HSV-2 infection is also more common in blacks (45.9%) than in whites (17.6%). Race and ethnicity in the United States are risk markers that correlate with other more fundamental determinants of health such as poverty, access to quality health care, health-care seeking behavior, illicit drug use, and living in communities with high prevalence of STDs.

Since the late 1970s, the number of Americans with genital herpes infection (i.e., prevalence) has increased 30%. Prevalence is increasing most dramatically among young white teens; HSV-2 prevalence among 12- to 19-year-old whites is now five times higher than it was 20 years ago. And young adults ages 20 to 29 are now twice as likely to have HSV-2.

What if the rumors are true and Rihana has genital herpes? There are many celebrieties that have.