Recently, the approach was used in Tan Tock Seng Hospital with some success. - ST SINGAPORE (The Straits Times/ANN): Ring-fencing strategies that aim to limit Covid-19 transmissions and contain their spread have been intensified recently, helping Singapore stave off a second circuit breaker for now. Experts note that larger areas are now being closed off and more people made to undergo swab testing. Professor Teo Yik Ying, dean of the National University of Singapore's (NUS) Saw Swee Hock School of Public Health, said that ring-fencing can help to flatten the curve of infections by preventing transmissions from spilling over to other sectors.