A woman (right) arrives at a designated center to be tested for COVID-19 at the Hong Kong Convention and Exhibition Centre, Wan Chai, Sept 1, 2020. (PHOTO / CHINA DAILY)

A man walks past a notice board with details about the hours of operation of the COVID-19 testing center at the Hong Kong Convention and Exhibition Centre in Wan Chai, Sept 1, 2020. (PHOTO / CHINA DAILY)

Hong Kong Chief Executive Carrie Lam Cheng Yuet-ngor (center, left) prepares to be tested for COVID-19 at a designated center at Central Government Offices, in Hong Kong, Sept 1, 2020. (PHOTO / INFORMATION SERVICES DEPARTMENT, HKSAR GOVT)

(From left, seated) Hong Kong's Financial Secretary Paul Chan Mo-po, Chief Secretary for Administration Matthew Cheung Kin-chung and Chief Executive Carrie Lam Cheng Yuet-ngor wait to be tested for COVID-19 at a designated center at Central Government Offices, in Hong Kong, Sept 1, 2020. (PHOTO / INFORMATION SERVICES DEPARTMENT, HKSAR GOVT)

(From left) Hong Kong's Secretary for Justice Teresa Cheng Yeuk-wah, Chief Secretary for Administration Matthew Cheung Kin-chung, Chief Executive Carrie Lam Cheng Yuet-ngor and Financial Secretary Paul Chan Mo-po pose for a photo after taking COVID-19 tests at a designated center at Central Government Offices, in Hong Kong, Sept 1, 2020. (PHOTO / INFORMATION SERVICES DEPARTMENT, HKSAR GOVT)

Tung Chee-­hwa, former Hong Kong chief executive and a current vice-­chairman of the National Committee of the Chinese People's Political Consultative Conference, arrives at the testing center at the Hong Kong Convention and Exhibition Centre to take part in the city's universal COVID-19 testing program. In Wan Chai, on Sept 1, 2020. (PHOTO / CHINA DAILY)

A medical worker takes a swab sample from Director of Health Constance Chan at the testing center at Queen Elizabeth Stadium in Hong Kong on Sept 1, 2020. (PHOTO / HKSAR GOVERNMENT)

A medical worker takes a swab sample from the consultant in-charge of dental services of the Department of Health, Wiley Lam, at the testing center at Queen Elizabeth Stadium in Hong Kong on Sept 1, 2020. (PHOTO / HKSAR GOVERNMENT)

A medical worker takes a swab sample from Legislative Council (LegCo) President Andrew Leung Kwan-yuen at the testing center at LegCo in Hong Kong on Sept 1, 2020. (PARKER ZHENG / CHINA DAILY)

Residents wait in line to take COVID-19 tests outside a designated center in Hong Kong, Sept 1, 2020. (KIN CHEUNG / AP)

A resident receives temperature check at a coronavirus testing center in Hong Kong, Sept 1, 2020. (KIN CHEUNG / AP)

Residents wait in line to take COVID-19 tests outside a designated center in Shatin, Hong Kong, Sept 1, 2020. (PHOTO PROVIDED TO CHINA DAILY)

A medical worker wearing protective gear takes a swab sample from a resident at a testing center in Shatin, Hong Kong, Sept 1, 2020. (PHOTO PROVIDED TO CHINA DAILY)

Residents wait to take COVID-19 tests at a designated center at Sheung Tak Community Hall, Tseung Kwan O, Sept 1, 2020. (CALVIN NG / CHINA DAILY)

A medical workers collects a throat swab from a resident at a designated testing center at Queen Elizabeth Stadium, Hong Kong, Sept 1, 2020. (PHOTO / INFORMATION SERVICES DEPARTMENT, HKSAR GOVT)