From 20 19 12 19. At that time, many people in Wuhan got viral pneumonia, and the cause could not be found. It was not until 65438+20201October 8 that it was finally determined to be novel coronavirus.
This has never been found in human body before, and no medicine can achieve therapeutic effect. The main route of transmission is through coughing droplets or sneezing droplets. If you have direct close contact with the patient, you will also be infected. Its symptoms: some are only fever or slight cough, some will develop into pneumonia, and some will be more serious or even die. However, there is evidence that Wuhan is not the first place where COVID-19 appeared on the earth.
2065438+In March 2009, a research team of the University of Barcelona detected COVID-19 in the collected wastewater samples. In September, research showed that COVID-19 virus may have spread in Italy; 165438+1On October 27th, the genetic material of COVID-19 was detected in the wastewater samples of a city in Brazil. There are indications that COVID-19 probably appeared in this world a long time ago, but people didn't notice it at that time. One thing is really abnormal.
From July 2065438 to July 2009, Fort Detrick Biological Base, the largest R&D center of the US military, was closed by the CDC. Shortly after the closure of Fort Detrick base, an inexplicable "e-cigarette disease" broke out in the nearby area.
There are some controversies:
Further research is needed. Some experts said that the COVID-19 outbreak first broke out in the United States from 2065438 to September 2009, but it was considered as an ordinary epidemic virus infection at that time, which led to the large-scale spread of the virus.
Some experts believe that the COVID-19 epidemic began in February 20 19 in Wuhan, China. These have yet to be confirmed by further research by experts.
However, the most important thing is the prevention and control of the epidemic. The prevention and control of the epidemic situation requires everyone to work together to reduce the spread and protect others in order to protect themselves.