Wilkins JT, Hirschhorn LR, Gray EL, Wallia A, et al. Serologic Status and SARS CoV-2 Infection over 6-Months of Follow-Up in
Healthcare Workers in Chicago: A Cohort Study. Infect Control Hosp Epidemiol 2021 Aug 9:1-29. doi: 10.1017/ice.2021.
PMID: 34369331