The World Health Organization is considering a new mission to seek the source of the coronavirus in China, amid growing controversy over the origin of a pandemic that has killed more than a quarter of a million people.

"Without knowing where the animal origin is, it’s hard to prevent it from happening again,” Maria Van Kerkhove, a WHO epidemiologist, said at a press briefing Wednesday. "There is discussion with our counterparts in China for a further mission, which would be more academic in focus, and really focus on looking at what happened at the beginning in terms of exposures with different animals,” she added.

Van Kerkhove in February participated in a mission to China, which concluded that the virus was zoonotic in origin. Bats appeared to be the "reservoir” for the virus, but an intermediate host could not be determined, the report said.