The Centre for Health Protection today said it is looking into 328 additional COVID-19 cases, of which 166 were detected by nucleic acid tests and 162 were identified via rapid antigen tests.

Among the new cases, 39 are imported while the rest are locally infected.

A total of 1,196,437 people have contracted the virus since the onset of the fifth wave of the epidemic, involving 9,148 deaths.

Meanwhile, the whole genome sequencing analysis conducted by the Department of Health's Public Health Laboratory Services Branch confirmed that four earlier imported cases carried the sub-lineage BA.4 under the Omicron mutant strain.

The cases involve three men and one woman aged 42 to 67 who arrived from the UK and Canada on May 8.

Hong Kong has so far recorded seven imported sub-lineage BA.4 cases and no such cases were found in the local community.

Separately, the Government made a restriction-testing declaration to cover Ping Wah House of Lok Wah North Estate in Kwun Tong, requiring people in the restricted area to undergo compulsory testing before the specified deadline.

Furthermore, due to a number of positive cases, 40 specified places are included in a compulsory testing notice.

The mobile specimen collection stations at Bellagio in Sham Tseng and On Yam Estate in Kwai Chung will be reopened tomorrow while the mobile station at Lei Muk Shue Estate in Tsuen Wan will extend service to May 19.

As there were positive sewage test results with relatively high viral loads in several areas of Tuen Mun, North and Islands districts, the Housing Department and the respective district offices will distribute COVID-19 rapid test kits to relevant residents as well as cleaning workers and property management staff working there.

For information and health advice on COVID-19, visit the Government's dedicated webpage.