Medical staff members process samples collected for COVID-19 tests at a nucleic acid test lab of the Pidu District Hospital of Traditional Chinese Medicine in Pidu District of Chengdu, capital of southwest China''s Sichuan Province, Dec. 10, 2020. (Photos: Xinhua/Shen Bohan)

Chengdu reported zero increase in new domestically transmitted COVID-19 cases and asymptomatic cases from 9 p.m. Tuesday to 6 p.m. Wednesday, while citywide nucleic acid tests are continuing, local authorities said. At the Pidu District Hospital of Traditional Chinese Medicine, medical workers have been working 24 hours nonstop to conduct COVID-19 tests as quickly as possible.

A medical staff member processes samples collected for COVID-19 tests at a nucleic acid test lab of the Pidu District Hospital of Traditional Chinese Medicine in Pidu District of Chengdu, capital of southwest China''s Sichuan Province, Dec. 10, 2020.

A medical staff member processes samples collected for COVID-19 tests at a nucleic acid test lab of the Pidu District Hospital of Traditional Chinese Medicine in Pidu District of Chengdu, capital of southwest China''s Sichuan Province, Dec. 10, 2020.

A medical staff member processes samples collected for COVID-19 tests at a nucleic acid test lab of the Pidu District Hospital of Traditional Chinese Medicine in Pidu District of Chengdu, capital of southwest China''s Sichuan Province, Dec. 10, 2020.

A medical staff member processes samples collected for COVID-19 tests at a nucleic acid test lab of the Pidu District Hospital of Traditional Chinese Medicine in Pidu District of Chengdu, capital of southwest China''s Sichuan Province, Dec. 10, 2020.