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This BBC report shows how contact tracing works in Singapore to control the spread of coronavirus. On 4 February 20 Chinese tourists visited a traditional Chinese medicine shop in Singapore. Only 18 coronavirus cases had been recorded in Singapore on that date. That visit to the medicine shop created a new cluster for the disease to spread. Singapore's contact tracing units traced such locations through its well developed and extensive contact tracing programme, which follows the chain of the virus, identifying and isolating people before they can spread the virus further. For about 40% of the 243 cases so far on March 19 the first indication they had was a call from the Singapore Health Ministry.     

About 6000 people have been contact traced so far, using a combination of CCTV footage, labor intensive detective work with phone calling. This includes an incident of a taxi ride of 6 minutes in which the person a yoga teacher was identified and contacted by the Health Ministry. Enforcement is done as the person was contacted at her home by three people who showed her a quarantine order, which said you could not go out or its fine time and jail time.

With about 8000 people per square kilometre, Singapore is small and densely crowded. It could easily be overwhelmed with hospitals not able to cope and the health system collapsing if this was not done. Wuhan could have happened here, says infectious diseases specialist Dr. Leong at Mont Elizabeth Novena hospital, who advises the government. 

Because the crime rate is low the police were given this task of tracing as a priority in addition to hospital units working on tracing. It also included the armed forces personnel helping with tracing so that it could be done quickly without delay.

This provides a lesson on how countries that have faced the health crisis have used innovative methods to tackle it with good results.