when did covid 19 start in world

The COVID-19 pandemic started with the first human cases of the disease occurring in Wuhan, China, in November and December 2019. The World Health Organization (WHO) was informed of several cases of pneumonia of unknown cause in Wuhan by the end of December 2019. WHO declared COVID-19 a public health emergency of international concern on January 30, 2020, and officially declared it a pandemic on March 11, 2020.