A news release by the WHO, an official tweet by Tedros Adhanom Ghebreyesus and a youtube video uploaded by the CNA confirms the claim.
Director-General of WHO, Tedros Adhanom Ghebreyesus in a re-tweet on 20 January 2020, said that he will be convening an Emergency Committee to learn whether the novel coronavirus creates a public health emergency of international concern on 22 January 2020.
According to a Youtube video by CNA, the Chinese authorities in a press conference on 22 January 2020 stated that the Chinese science experts considered the disease is transmitted through human to human. (Video Reference: 1:27)
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.