The fake news and anti-China agenda surrounding the novel coronavirus outbreak have triggered anger in China and around the world, as social media influencers, medical experts and the Chinese government have condemned the conspiracy theories about the source of the virus.

Now the World Health Organization (WHO) has also joined the anti-conspiracy voices with Director-General Dr. Tedros Adhanom Ghebreyesus warning the world to be "very, very careful" about coronavirus-related information.

"We shouldn't trust anything until it's proven with science and evidence," Tedros said during a WHO news briefing on Thursday.

He also said an international team is working in China to investigate the virus and government's measures.

Related: The conspiracy that a Chinese lab created the novel coronavirus as bioweapon, and why it's a lie.