Before revision:  Under realistic conditions  , we find that preventive screening of employees only might be sufficient to control outbreaks in nursing homes (on average, one or less secondary infections per index case), provided that turnover times and detection thresholds of the tests are low enough.
After revision:  Under realistic conditions and in absence of an effective vaccine , we find that preventive screening of employees only might be sufficient to control outbreaks in nursing homes (on average, one or less secondary infections per index case), provided that turnover times and detection thresholds of the tests are low enough.