Genital herpes is common. At least 45 million Americans age 12 and older have genital herpes. Genital HSV-2 infection is more common in women than men. About 1 in 4 women have HSV-2 infection compared to almost 1 in 8 men. This is due to the fact that women can get genital herpes and some other STIs more easily than men.
美国人口数量：
3.15亿人（2013年）
中国13亿人，估计至少有1亿多人吧？
