jointly worked out nine documents on the outbreak, including a trial version of guidelines on the diagnosis and treatment of viral pneumonia of unknown cause. Jan. 4

-- The NHC and relevant health departments in Hubei Province issued a treatment manual for viral pneumonia of unknown cause to all medical institutions in Wuhan City, a

nd provided citywide training. -- Head of the China CDC talked over phone with director of the U.S. CDC about the pneumonia outbreak. The two sides agreed to keep in c

lose contact for information sharing and technological cooperation. Jan. 5 -- The Wuhan Municipal Health Commission updated briefing on the situation of viral pneumonia of unknown cause, reporting a total of 59 c

ases. Laboratory test results ruled out respiratory pathogens, such as influenza, avian influenza, adenovirus, the Severe Acute Respiratory Syndrome coronavirus, and Middle East Respiratory Syndrome coronavirus, as the cause. -- China informed the WHO about the outbreak updates. -- The WHO released its first briefing on cases of pneumonia of unknown cause in Wuhan. Jan. 6 -- The NHC gave a briefing on cases of pneumonia of unknow