The Centre for Health Protection today said it is investigating 11 additional COVID-19 cases, of which eight are locally transmitted and three are imported.

Among the local cases, four have unknown sources of infection.

One of the unlinked cases involves a 47-year-old male clerical staff who works at the Labour Department who developed fever on March 1 and last went to work on March 3.

The second case involves an 18-year-old student who developed headache and fever on February 22. He did not attend face-to-face classes at school.

The third case involves a 48-year-old man who is also a clerical staff. He last attended work on February 26 and developed fever on March 1.

The remaining case involves a 37-year-old part-time foreign domestic helper. She last worked on February 23 and developed headache on February 28.

A total of 235 cases have been recorded in the past 14 days, including 197 local cases of which 66 are untraceable.

Meanwhile, five places are now covered by compulsory testing notices.

They include the Labour Department at 10/F, Cheung Sha Wan Government Offices and IMC Asia Pacific at Room 2001, 20/F, 100 Queen's Road Central where one or more confirmed cases were detected. Those who had worked or had been on duty at these premises from February 20 to March 5 have to undergo testing by March 7.

The Government will set up mobile specimen collection stations at the platform outside Tsuen King Circuit Sports Centre in Tsuen Wan and Yan Tat House of On Tat Estate in Kwun Tong on March 6.

The service period of the mobile stations at Wong Tai Sin Square, Maple Street Playground in Sham Shui Po, Sha Tin Town Hall Plaza and Tai Po Community Centre will be extended to March 14.

Additionally, the Government said it will continue to empower registered medical practitioners, during the 14-day period from March 6 to 19, to require patients suspected to have contracted COVID-19 to undergo testing.

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