When did the COVID-19 epidemic begin? It was found earlier in many countries around the world

The COVID-19 has been a major concern in the past two years. Many people still want to know when the COVID-19 epidemic began? It is understood that China reported COVID-19 cases in November 2019, but some countries had COVID-19 earlier. Time of outbreak

In March 2019, a research team from the University of Barcelona in Spain detected COVID-19 in the wastewater samples collected. In September, research showed that COVID-19 might have spread in Italy. In November, there were signs of COVID-19 in Italy. In the same month, COVID-19 was detected in Brazilian wastewater samples.

In March 2021, the joint research report on the traceability of COVID-19 between China and WHO was released in Geneva. The report showed that the South China Seafood Market in Wuhan was not the original source of COVID-19. The exact origin of COVID-19 has not yet been determined.

The main transmission routes of novel coronavirus are respiratory droplet transmission and contact transmission. The transmission routes of aerosol and fecal oral transmission need to be further clarified. At present, the source of infection of COVID-19 has not been determined, and it has been determined that the new regulations come from nature.