Health authorities in Wuhan, China (the capital of Hubei Province) reported an outbreak of pneumonia cases of unknown cause on December 31, 2019, and an investigation was opened in early January 2020.
Mashirika ya Afya Wuhan, Uchina (mji mkuu wa mkoa wa Hubei) waliripoti visa vya mchochota wa pafu zisizo na chanzo inayojulikana tarehe 31 January 2019, na uchunguzi ulianzishwa mwanzo wa January 2020.