In an effort to jointly fight against the COVID-19 epidemic, China has sent multiple medical teams to different countries to share its experience, and it's very important that China shares its experience and provides help to other countries, said Takeshi Kasai, the World Health Organization's regional director for the Western Pacific, on Tuesday.

Kasai said under the current situation of the epidemic, any lifting of lockdowns imposed to contain the spread of the novel coronavirus must be gradual, and if restrictions were to be relaxed too soon, there would be a resurgence of infections, according to a Reuters report. 

Regarding the source of the novel coronavirus, Kasai said that relevant research indicates that the virus may have originated in bats and spread to humans, but the work to trace the source of the virus is still in progress, and there is no conclusion.