Thirty years after the discovery of the human immunodeficiency virus (HIV), about 50 000 Americans and over 2 million persons worldwide are infected each year, most of them through sexual relations.1 This occurs despite detailed knowledge of how HIV is transmitted and the availability of a highly effective, cheap, safe method of HIV prevention, the condom, which in addition to its effectiveness in HIV prevention, also decreases the likelihood of other sexually transmitted diseases as well as unwanted pregnancies.
Katz MH. Preexposure ProphylaxisA Path Forward. JAMA Intern Med. 2015;175(2):255-256. doi:10.1001/jamainternmed.2014.6798