A new study is suggesting that the proper use of PrEP can reduce STIs by up to 40 percent.

It’s not the medication itself. It’s that the regular screenings required for proper PrEP usage would catch many STIs.

Those using PrEP are currently required to get screened for STIs every six months. If treated rather quickly, those STIs won’t spread to other men and overall rates of infection would decrease.

The findings were announced by the CDC and the Rollins School of Public Health at Emory University.

Dr. Samuel Jenness, the study’s author, says what’s vital is ensuring guidelines are strictly followed across the board.

“Right now, there’s a tremendous amount of [diversity] in terms of how the STI testing is being performed by these clinicians” said Jenness, according to HIVPlus.

“As PrEP has been implemented in smaller practice groups or by individual clinicians outside of large metropolitan areas, we have some suggestions that the guidelines aren’t being adhered to with respect to STI testing as much.”

The study also found that increasing screenings to four times a year would not significantly affect the prevention of STIs.