People queue up at a community vaccination centre to receive a dose of the Sinovac Biotech coronavirus disease (COVID-19) vaccine, in Hong Kong, China, February 26, 2021. REUTERS/Tyrone Siu

People queue up at a community vaccination centre to receive a dose of the Sinovac Biotech coronavirus disease (COVID-19) vaccine, in Hong Kong, China, February 26, 2021. REUTERS/Tyrone Siu

People queue up at a community vaccination centre to receive a dose of the Sinovac Biotech coronavirus disease (COVID-19) vaccine, in Hong Kong, China, February 26, 2021. REUTERS/Tyrone Siu

People wait to receive a dose of the Sinovac Biotech coronavirus disease (COVID-19) vaccine at a community vaccination centre in Hong Kong, China, February 26, 2021. REUTERS/Tyrone Siu

People queue up at a community vaccination centre to receive a dose of the Sinovac Biotech coronavirus disease (COVID-19) vaccine, in Hong Kong, China, February 26, 2021. REUTERS/Tyrone Siu

People queue up at a community vaccination centre to receive a dose of the Sinovac Biotech coronavirus disease (COVID-19) vaccine, in Hong Kong, China, February 26, 2021. REUTERS/Tyrone Siu

Chinese Commerce Minister Wang Wentao attends a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao attends a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao attends a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao attends a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

State Council Information Office spokesman Chen Wenjun, Chinese Commerce Minister Wang Wentao, Vice Commerce Minister Wang Shouwen and Vice Commerce Minister Qian Keming attend a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao and Vice Commerce Minister Wang Shouwen attend a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao attends a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao attends a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

State Council Information Office spokesman Chen Wenjun, Chinese Commerce Minister Wang Wentao, Vice Commerce Minister Wang Shouwen and Vice Commerce Minister Qian Keming attend a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Hong Kong's Finance Secretary Paul Chan (2nd L) poses for pictures at a news conference on the annual budget, in Hong Kong, China February 24, 2021. REUTERS/Yoyo Chow

Chinese Commerce Minister Wang Wentao attends a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Chinese Commerce Minister Wang Wentao speaks during a State Council Information Office news conference in Beijing, China February 24, 2021. REUTERS/Carlos Garcia Rawlins

Hong Kong's Finance Secretary Paul Chan delivers the annual budget address at the Legislative Council in Hong Kong, China February 24, 2021. REUTERS/Yoyo Chow

Protesters take part in a demonstration demanding benefits for the unemployed and a cash handout ahead of the annual budget announcement, outside the Hong Kong Government office in Hong Kong, China February 24, 2021. REUTERS/Pak Yiu

Members of the Hong Kong Fire Services Department receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

A person receives a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

A person receives a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

Officers of Hong Kong Police Force wait in line to receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

People receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

Chris Tang, commissioner of the Hong Kong Police Force, receives a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

Officers of Hong Kong Police Force wait to receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

An officer of Hong Kong Police Force receives a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

Officers of Hong Kong's Customs and Excise Department wait to receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

An officer of Hong Kong's Correctional Service Department holds his arm after receiving a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

Officers of Hong Kong's Customs and Excise Department wait to receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

Officers of Hong Kong's Immigration Department wait to receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

Chris Tang, commissioner of the Hong Kong Police Force, waits to receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

An officer of Hong Kong's Immigration Department prepares to receive a dose of the Sinovac Biotech's COVID-19 vaccine at a community vaccination center in Hong Kong, China, February 23, 2021. Paul Yeung/Pool via REUTERS

Secretary for Constitutional and Mainland Affairs Erick Tsang Kwok-wai (C) speaks during a news conference to announce changes to election and oath taking rules, in Hong Kong, China February 23, 2021. REUTERS/Tyrone Siu

Secretary for Constitutional and Mainland Affairs Erick Tsang Kwok-wai (C) speaks during a news conference to announce changes to election and oath taking rules, in Hong Kong, China February 23, 2021. REUTERS/Tyrone Siu

Secretary for Constitutional and Mainland Affairs Erick Tsang Kwok-wai speaks during a news conference to announce changes to election and oath taking rules, in Hong Kong, China February 23, 2021. REUTERS/Tyrone Siu

A Cathay Pacific flight attendant prepares to receive China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

Doctors and nurses wait to receive China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

An elderly woman receives China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

A Cathay Pacific pilot holds his arm after receiving China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

A Cathay Pacific pilot receives China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

A nurse holds her arm after receiving China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

A nurse holds her arm after receiving China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

A nurse receives China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

People walk past a booth of smartphone maker Oppo at the Mobile World Congress (MWC) in Shanghai, China February 23, 2021. REUTERS/Aly Song

Staff members stand at a Xilinx Inc booth at the Mobile World Congress (MWC) in Shanghai, China February 23, 2021. REUTERS/Aly Song

People walk past a ZTE Corp booth at the Mobile World Congress (MWC) in Shanghai, China February 23, 2021. REUTERS/Aly Song

Attendants stand at a ZTE Corp booth at the Mobile World Congress (MWC) in Shanghai, China February 23, 2021. REUTERS/Aly Song

People visit a Qualcomm booth at the Mobile World Congress (MWC) in Shanghai, China February 23, 2021. REUTERS/Aly Song

People visit a Qualcomm booth at the Mobile World Congress (MWC) in Shanghai, China February 23, 2021. REUTERS/Aly Song

A man walks past a Qualcomm sign at the Mobile World Congress (MWC) in Shanghai, China February 23, 2021. REUTERS/Aly Song