A team from the World Health Organisation (WHO) will arrive in the central Chinese city of Wuhan on Thursday to begin investigating the origins of the Covid-19 pandemic.
Here is a timeline looking at key events in the relationship between China and the WHO since the outbreak began.
2019
Dec 31st: The WHO is first notified by China of a "pneumonia of unknown cause". WHO says its China office picked up a report of "viral pneumonia" from Wuhan Municipal Health Commission website and asked Chinese authorities for more information.
January 2020
Jan 3rd: China begins regular briefing with WHO about the outbreak of "viral pneumonia of unknown cause" in Wuhan.
Jan 5th: WHO says it has asked China for more information and advises other member states to take precautions.
Jan 9th: China tells WHO a newly discovered coronavirus is the cause of the outbreak.
Jan 10th: Chinese officials hold phone meeting with WHO Director-General Tedros Adhanom Ghebreyesus. China shares information about how the coronavirus is detected.
Jan 11th: After reporting the first official fatality from the disease, China shares genome sequence of the coronavirus with WHO.
Jan 14th: WHO tweets that "preliminary investigations conducted by China have found no clear evidence of human-to-human transmission". WHO expert Maria Van Kerkhove tells news conference the same day "it is certainly possible that there is limited human-to-human transmission".
Jan 20-21st: WHO sends delegation to Wuhan. Chinese experts share detection and treatment protocols with WHO delegation.
Jan 25th: China's National Health Commission said in a letter to WHO's Tedros that it would welcome international experts to China to help "strengthen epidemic prevention and control".
Jan 28th: President Xi meets Tedros in Beijing and says China has responded in a timely, open, transparent and responsible manner, and is ready to work with the WHO and the international community.
Jan 30th: WHO declares outbreak to be a public health emergency of global concern – its highest alert level.
February 2020
Feb 16th: 25-member China-WHO team begins nine-day field trip in China. They arrive in Wuhan on February 22nd and learn about epidemic control measures and medical treatments.
Feb 24th: Joint team holds news conference in Beijing and says China's actions slowed the spread of the epidemic and prevented or delayed hundreds of thousands of cases.
Feb 28th: Joint team publishes report praising the "remarkable speed" at which China isolated the virus, established diagnostic tools and learned how the virus was transmitted.
April 2020
April 14th: President Donald Trump announces halt to US funding for WHO, accusing it of being biased towards China and failing in its duties.
April 18th: Senior diplomat Wang Yi rebukes US criticism of WHO in phone conversation with Tedros.
April 22nd: Australia calls for independent investigation into Covid-19 origins, further angering Beijing. China's ambassador to Australia Cheng Jingye says the call is "politically motivated".
May 2020
May 19th: Annual ministerial meeting of WHO's 194-member states passes resolution calling for an "impartial, independent and comprehensive evaluation" of global Covid-19 response to be launched at the earliest opportunity. Evaluation should include the "zoonotic source of the virus and the route of introduction to the human population." China and the United States also sign.
May 20th: US Secretary of State Mike Pompeo accuses China of denying investigators access to facilities, withholding virus samples and censoring discussion.
July 2020
July 8th: United Nations says it received formal notice from the United States to withdraw from WHO. President Trump accuses WHO of "alarming lack of independence" from China.
July 9th: WHO sets up independent panel chaired by former New Zealand Prime Minister Helen Clark and former Liberian President Ellen Johnson Sirleaf to examine global pandemic response.
September 2020
Sept 17th: Independent panel sets terms of reference for inquiry, saying it aims to establish "the timeline and events which culminated in Covid-19 becoming a global pandemic".
December 2020
Dec 18th: WHO says it will send a team of 10 scientists to Wuhan "next month". Independent panel says it is now "well advanced" in its preparation of chronology about the global spread of Covid-19.
January 2021
Jan 6th: WHO's Tedros expresses disappointment WHO experts have not yet been granted visas to begin the investigation.
Jan 11th: Chinese health authorities confirm a WHO team will arrive in Wuhan on January 14th.
