The main reasons for the high mortality rate at the start of the new crown include sudden outbreaks and lack of vaccine protection.
Sudden outbreak of epidemic: high mutation rate, high infectiousness, at that time the world had no experience in facing the new crown virus, due to the suddenness of the outbreak, the characteristics of the pathogen and the epidemiological features were not clear at the early stage, which led to more patients with severe diseases and higher mortality rate at the early stage.
Lack of vaccine protection: the sudden outbreak of the epidemic forced the world to respond to the war in haste, and since the pathogen was discovered for the first time, there was no corresponding vaccine to prevent the disease, which led to a higher mortality rate in the early stage.
With the continuous deepening of various researches, people have gradually grasped the characteristics and epidemiological features of the pathogen, and various vaccines have been introduced both at home and abroad, and large-scale clinical trials and vaccinations have been carried out in full scale, which have substantially reduced the mortality rate.
The new crown epidemic is currently in a state of pandemic, usually travel as much as possible to wear masks, less gatherings, if found to be unwell, should promptly go to the hospital for consultation and treatment under the guidance of a professional doctor.