File photo: CGTN

A COVID-19 vaccine from China's Sinopharm passed Phase II clinical trials with "no serious adverse reactions." All volunteers generated antibodies after two doses in 28 days, the company said on Tuesday.

It is the world's first inactivated COVID-19 vaccine. The trials began in April, with a total of 1,120 participants aged between 18 and 59. 

China has the highest number of vaccine candidates for COVID-19, with five undergoing clinical trials.