The general epidemic can be traced back to 14 days. The retrospective date of the epidemic is that someone has a fever and is diagnosed with the virus, which needs to be traced back to all the people who have contacted him during the period before 14 days. Tracing the source is to explore the origin of things.

For the prevention of COVID-19 epidemic, the most important thing is to take protective measures, develop good personal habits, strengthen exercise, improve physical fitness, and wear masks at ordinary times. The epidemic usually dates back to 14 days.

Characteristics of novel coronavirus's disease.

The main routes of transmission in novel coronavirus are respiratory droplet transmission and contact transmission, and those who have had close contact with confirmed cases are close contacts.

According to the existing case data, novel coronavirus is mainly characterized by fever, dry cough and fatigue, and a few patients are accompanied by symptoms of upper respiratory tract and digestive tract such as nasal congestion, runny nose and diarrhea.

Most severe cases have dyspnea after 1 week, and severe cases rapidly progress to acute respiratory distress syndrome, septic shock, metabolic acidosis that is difficult to correct, bleeding and coagulation dysfunction and multiple organ failure.

It is worth noting that severe and critically ill patients may have moderate to low fever or even no obvious fever during the course of the disease. Mild patients only show low fever and mild fatigue. , and no pneumonia.

Judging from the current cases, most patients have a good prognosis, and a few patients are in critical condition. The prognosis of the elderly and those with chronic basic diseases is poor. The symptoms of children's cases are relatively mild.