The Centers for Disease Control and Prevention has expanded its guidelines for HIV postexposure prophylaxis to people exposed to the virus in nonoccupational settings, including through sex, injection-drug use, and other high-risk behaviors. PEP has been recommended since 1996 for health care workers exposed to the virus. Studies show a four-week course of anti-HIV drugs started within 72 hours of possible exposure can greatly reduce the risk of HIV infection.
