In the United States, the public health response to control COVID-19 required rapid expansion of the contact tracing workforce from approximately 2200 personnel prepandemic to more than 100 000 during the pandemic. We describe the development and implementation of a free nationwide training course for COVID-19 contact tracers that launched April 28, 2020, and summarize participant characteristics and evaluation findings through December 31, 2020. Uptake of the online asynchronous training was substantial: 90 643 registrants completed the course during the first 8 months. In an analysis of a subset of course participants (n = 13 697), 7724 (56.4%) reported having no prepandemic public health experience and 7178 (52.4%) reported currently serving as case investigators, contact tracers, or both. Most participants who completed a course evaluation reported satisfaction with course utility (94.8%; 59 497 of 62 753) and improved understanding of contact tracing practice (93.0%; 66 107 of 71 048). These findings suggest that the course successfully reached the intended audience of new public health practitioners. Lessons learned from this implementation indicate that an introductory course level is appropriate for a national knowledge-based training that aims to complement jurisdiction-specific training. In addition, offering a range of implementation options can promote course uptake among public health agency staff. This course supported the emerging needs of the public health practice community by training a workforce to fill an important gap during the COVID-19 pandemic and could serve as a feasible model for enhancing workforce knowledge for future and ongoing public health threats.

Thanks to assiduous public health efforts, the overall annual rate of perinatal HIV transmission has decreased. In the United States, 44 infants acquired HIV perinatally in 2014, down from 71 in 2012.1 Mother-to-child (perinatal) HIV transmission is preventable2: the risk of perinatal HIV transmission can be reduced to <2% if a woman receives antiretroviral therapy (ART) during pregnancy and avoids breastfeeding and if the infant receives prophylaxis soon after birth.3 If a mother has HIV diagnosed during labor, treatment as late as the intrapartum period can reduce the rate of transmission from 25.5% to 10.0%. However, beginning prophylaxis 3 or more days after birth does not substantially reduce the risk of contracting HIV.4 Thus, identifying HIV infection early, through HIV testing of pregnant women and newborns, can help provide essential and timely linkage to care for mother and child.5