Singapore reported 1,504 new COVID-19 infections, including 273 from dormitories housing foreign workers, the health ministry said.
The new cases also included 13 imported infections, the Ministry of Health (MOH) said.
1,218 were community cases, the ministry said. There are currently 163 cases of serious illness requiring oxygen supplementation, and 23 in critical condition in the intensive care unit (ICU).
Eight new cases confirmed on Wednesday were from the Woodlands Dormitory, bringing its total to 54. The dormitory for migrant workers has been added to a list of 12 large clusters currently being monitored by the MOH, it said.
It involves intra-dormitory transmission among residents with no evidence of spread beyond the dormitory, the ministry added.
All the persons have been quarantined.
Singapore has reported a total of 81,352 COVID-19 cases and 68 deaths from the disease. There were also four imported cases, those who arrived from abroad, taking the daily tally to 1,457, the highest since the pandemic began early last year.
Over the last 28 days, 97.9 per cent of the local cases were asymptomatic or had mild symptoms.