In a cohort of essential workers in the United States previously infected with SARS-CoV-2, risk factors for reinfection included being unvaccinated, infrequent mask use, time since first infection, and being non-Hispanic Black. Protecting workers from reinfection requires a multipronged approach including up-to-date vaccination, mask use as recommended, and reduction in underlying health disparities.
Keywords: COVID-19; SARS-CoV-2; United States; coronaviruses; frontline workers; mRNA vaccines; omicron variant; reinfection; respiratory infection; risk factors; vaccine effectiveness; viruses; zoonoses.