BEIJING — China has established a national supply network for COVID-19 convalescent plasma, with a reserve bank in Wuhan, in Central Hubei province, and similar stocks located in provinces across the country, a health official said on June 10.

Guo Yanhong, an official with the National Health Commission, said at a press conference that the plasma, collected from COVID-19 patients who were recovering from the disease, had proven effective in treating severe COVID-19 patients.

So far, the country has collected a total of 1.47 million ml of plasma from more than 4,700 donations, around 60 percent of which were made in Hubei, Guo said.