When did the Wuhan new coronavirus outbreak start?

New crown pneumonia is also known as pneumonia caused by novel coronavirus infection, which is defined by the WHO as COVID-19.Patients were first found in December 2019, and a variety of unexplained pneumonia cases were found one after another in Wuhan, Hubei Province.Most of these cases had exposure to the South China Seafood Market in the early stages of the disease, which caused the patient's morbidity and manifested itself as an acute respiratory infectious disease.

The main clinical manifestations of the early stage of the disease are fever, cough, sore throat, runny nose, weakness and loss of smell, taste, further progress, and gradually there will be respiratory distress, severe patients can also progress to respiratory failure, acute respiratory distress syndrome, shock, and even multiple organ failure, especially patients with underlying diseases are more likely to evolve into a serious illness.