TABLE S1. Definitions of themes and categories of COVID-19 mitigation strategies considered in the content analysis (cont.) No. Theme 14 Surveillance Category Contact tracing and quarantine Definitiona Contact tracing to identify individuals who may have been exposed to a person with COVID-19; quarantine to separate individuals who have had close contact with someone with COVID-19 to determine whether they develop symptoms or test positive for the disease 15 Surveillance Return to work postrecovery policy 16 Surveillance Temperature screening and quarantine Any strategy implemented for employees returning to work following a COVID-19 case based on symptoms or a doctor's recommendation Screen for employees with temperature >99.5°F (or other cutoff value) and keep identified employees away from workplace to determine whether they develop COVID-19 symptoms or test positive for the disease 17 Surveillance Test for infection and isolation Test employees for COVID-19 (virus test); isolation keeps an employee who is sick with COVID-19 or tested positive for COVID-19 without symptoms away from workplace 18 Vaccination 19 Worker education Vaccination Worker education Any recommendation regarding vaccination of employees against COVID-19 Employers educate and train workers and supervisors about how they can reduce the spread of COVID-19 aDefinitions of mitigation categories were adapted from those of Llanos-Soto et al. (43). 438 Food Protection Trends November/December