By Ethan Covey
BOSTON—Although HIV transmission rates in the United States are low, there are a number of rapid transmission clusters where transmission far exceeds the national average, according to a CDC study presented at CROI 2018 (abstract 40).
Transmission risk in the United States is approximately four transmission events per 100 person-years, meaning that in a group of 25 HIV-infected individuals, there is an expectation that there would be one transmission event each year.