If you want numbers or % maybe this link will be useful. Take a look, specially, in the paragraph number 30.

http://www.wtaworld.com/showthread.php?t=52430

HIV testing
The extent of infection among those performers is unknown because no government or regulatory medical agency has ever tracked the industry consistently. The limited data that does exist is alarming. The Adult Industry Medical HealthCare Foundation (AIM), an industry-backed clinic in Sherman Oaks, administered voluntary tests to a group consisting primarily of adult film workers. Of 483 people tested between October 2001 and March 2002, about 40% had at least one disease. Nearly 17% tested positive for chlamydia, 13% for gonorrhea and 10% for hepatitis B and C, according to Sharon Mitchell, a former adult actress who founded AIM. None of the tests came up positive for HIV, Mitchell said. The testing was funded in part by the Los Angeles County Health Department.

By comparison, 23,277 cases of gonorrhea were reported statewide in 2001, less than one-tenth of 1% of the state's population, according to the Department of Health Service's division of communicable disease control. For chlamydia, 101,871 cases were reported for the year, or about three-tenths of 1%--a rate health officials consider epidemic. The chlamydia rates in the porn world are about 57 times higher than those epidemic proportions. But that and other statistics can also be explained by the small size of the population and its abnormally high rate of sexual activity.


...I don´t know for sure but it seems to me a trustworthy reading.