Mass COVID-19 testing of asymptomatic health-care workers in a tertiary hospital during an outbreak in another hospital in Singapore: an effective strategy?

@#In response to a COVID-19 outbreak within a hospital in Singapore, a single mass swab exercise was conducted at another tertiary hospital to detect possible inter-hospital transmission. The exercise yielded no positive results, demonstrating non-targeted mass testing as an impractical strategy to track inter-hospital transmission.