"I cannot disclose this information unless I have my patient's written or verbal permission. However, I am allowed to write an additional prescription for his/her sexual partner, and I offer to do the follow-up of him/her. I also know that pharmacists are allowed, in most states, to duplicate a prescription to treat an STI for a partner when your patient presents to fill his/her prescription. If I find that treatment of a person who suffered significant exposure has not taken place, I can follow up with the proper health agency to notify that at-risk person that he/she has been exposed to the specific infection and should be treated. By statute (https://www.cdc.gov/std/program/final-std-statutesall-states-5june-2014.pdf p. 277), they're allowed to do this without identifying your patient."