Coronavirus: half of Singapore’s cases have no symptoms

While those with no symptoms might be less infectious, the lack of visible indication of the virus highlights challenges with re-opening

A healthcare worker speaks to a resident about Covid-19 at a check up camp in Dharavi, one of Asia's largest slums, Mumbai, India. Reuters

Fans of Bohemians Prague stand on ladders as they prepare to watch the Czech first league soccer match between Bohemians Prague and Sparta Prague behind fence in Prague, Czech. EPA

A Christian priest cleans the church area as places of worship were allowed to re-open with strict guidelines from 8 June, in, Bhopal, India. EPA

An employee wearing a protective face mask checks the temperature of a visitor at the entrance at a restaurant along a pedestrian street in central Tbilisi. Cafes and restaurants re-opened in Georgia's capital last week. AFP

Hostlers and horse coaches wear face masks as they practice social distancing during a horse race at Beirut Hippodrome, as Lebanon re-opened its horse racing tracks, in Beirut, Lebanon. Reuters

Musicians perform next to Spanish artist Diego Velazquez's paintings as the Prado museum reopens in Madrid, Spain. Reuters

People enjoy a water slide in Yongin, South Korea. Reuters

A nurse works at the Intensive Care Unit ward where patients infected with coronavirus are being treated at the Doctor Ernesto Che Guevara Public Hospital in Marica city, state of Rio de Janeiro, Brazil. AFP

A man has his temperature checked at the entrance of the Nizamiye Mosque ahead of the Friday prayer in Midrand, Johannesburg. AFP

At least half of Singapore's newly discovered coronavirus cases show no symptoms, the co-head of the government's virus task force said on Monday, reinforcing the city-state's decision to ease lockdown restrictions very gradually.

Singapore has one of the highest infection tallies in Asia, with more than 38,000 cases, because of mass outbreaks in dormitories for its migrant workers. It reopened schools and some businesses last week after a near two-month lockdown.

"Based on our experience, for every symptomatic case you would have at least one asymptomatic case," Lawrence Wong told Reuters, adding that the discovery was made in recent weeks as Singapore stepped up testing.

Singapore has not previously disclosed how many asymptomatic cases it has recorded.

Mr Wong did not reveal the number of asymptomatic cases in Singapore, which has recorded 6,294 virus infections over the last two weeks, with the vast majority among migrant workers.

China said 300 symptomless Covid-19 carriers in its central city of Wuhan, the pandemic epicentre, had not been found to be infectious. But some experts say asymptomatic infections are common, making for a huge challenge in controlling the disease.

Mr Wong said that while asymptomatic cases had fewer opportunities to spread the virus as they were not coughing or sneezing, there have been cases of asymptomatic transmission in Singapore, especially between patients living in close quarters.

He said the discovery of the level of asymptomatic carriers prompted the government's plans for a gradual lifting of curbs that require many people to still work from home and mix socially only with their families.

"People have commented - why are we not reopening the economy faster?" Mr Wong said. "We have to take a more cautious approach... there are still asymptomatic cases which we may not have detected circulating in the community."