Herpes, the tip of the STD iceberg.

In the New York Times's (6/9) City Room blog, Sewell Chan wrote that "[m]ore than one-fourth of adult New Yorkers -- 26 percent, compared to the national average of 19 percent -- are infected with herpes simplex virus 2, the virus that causes genital herpes," according to a study published this month in the journal Sexually Transmitted Diseases. City health officials are "concerned about the prevalence of the condition because it facilitates the spread of HIV, and can also be transmitted to newborns, though such cases are rare."
Comment: The NYC Dept of PH has a strong STD program which may well being finding more STDs than the average community. STDs of all types have always been under-reported. One more reason for using “Safe Sex Practices.”