They are largely Persons Under Quarantine who turned positive for COVID-19. This means that they have been isolated early and ring- fenced, and not likely to be moving around while being infectious.
MOH has also established that the four units with confirmed cases are in the same stack in the block. Airborne transmission along the stack is highly unlikely based on initial assessment, MOH said. Epidemiological investigations are ongoing to determine linkages and the source of transmission.
Meanwhile the National Environment Agency (NEA) has worked with the town council (TC) to carry out stepped-up cleaning measures to clean and disinfect the block.
As a precaution to prevent any further spread to the community, MOH is casting their surveillance net wide by administering PCR tests for the whole block. The mandatory test took place from 21 May to 22 May.
407 residents and visitors of the block were swabbed over the two days. Thus far, MOH said one individual was found to be positive for COVID-19. The results of 126 others are pending. More details on the positive case will be reported in upcoming press releases, MOH said.
Those who are still awaiting their test results are advised to stay at home and seek immediate medical attention if they feel unwell. Individuals who missed their test can proceed to any of the clinics in the Annex between 23 and 24 May 2021 for the mandatory free swab test. They are to bring along their NRIC and TraceTogether Tokens, for identification purposes.
So far, there is only one Housing & Development Board (HDB) block in Singapore with infected cases seen in more than two households.
Over at Block 559 in Pasir Ris St 51, 4 COVID-19 cases had been detected. They come from 2 different households living in the same block.
Residents are advised to go to Coral Regional Screening Centre (Former Coral Primary School) between 23 May to 24 May, 9 am to 12 noon, and 1pm to 4 pm for their tests.