SINGAPORE, June 22 — A nurse at Mount Elizabeth Novena Hospital, a delivery rider with Foodpanda as well as a foreign domestic worker were the three Covid-19 community cases with no known sources of infection reported yesterday.

In its nightly update on the coronavirus situation here, the Ministry of Health (MOH) said that the nurse is a 33-year-old permanent resident who was last at work on June 17.

The woman — who was not involved in patient care — had last tested negative for Covid-19 on June 7 as part of the ministry’s rostered routine testing of workers.

The delivery rider is a 29-year-old Singaporean man while the foreign domestic worker is a 38-year-old Filipina.

MOH revised its daily tally of unlinked cases from five to three in its nightly update, after two of them were linked to confirmed cases.

Besides the three unlinked cases, there were 10 other new community cases that have been traced to past infections.

Of the 10, five were part of the Bukit Merah View Market and Food Centre cluster, which now has 78 cases in total.

MOH also identified two new clusters that were formed in separate public housing blocks in Bukit Merah View — blocks 119 and 121.

In yet another testing operation that the ministry announced yesterday, staff members at the NTUC FairPrice branch at Bukit Merah Central will be tested for Covid-19.

Rounding up the total of 16 new infections reported for the day were three imported cases — all were Singaporeans who returned from Indonesia, the United Arab Emirates and the United Kingdom.

Overall, the number of new cases in the community has shot up from 49 in the week before to 103 in the past week.

The number of cases with no known links in the community has also climbed from 15 in the week before to 20 in the past week.

MOH also said that the cluster linked to a 59-year-old Singaporean woman who works at Mary Fashion and Trading has been closed because no more cases had surfaced for the past two incubation periods.

New cases in Bukit Merah View market cluster