Authorities said they would carry out a further round of testing on residents of Pok Tat House on the Pok Hong Estate after 94 people tested preliminary positive and seven tests came back with undetermined results
The exercise is expected to conclude at about 1pm on Monday.
Officials had ordered the tests after the virus was found in sewage from the block.
Elsewhere in Sha Tin, an overnight lockdown at at King Wo House on the Wo Che Estate was lifted after officials detected 22 preliminary positive cases of Covid-19 out of about 780 tests.
Authorities moved in after the virus was detected in sewage samples, indicating that asymptomatic patients may be present there.
They lifted the restrictions at 11.15am on Sunday, with people allowed to leave if they could show they had undergone testing.
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Last updated: 2022-02-20 HKT 13:28