In the States, the first case of infection occurred in September 2019, while in China it occurred in late December of that year, experts say.
Scientists from China conducted a study that concluded that the spread of the COVID-19 coronavirus in the United States may have begun as early as September 2019 — earlier than in China. This is stated in the work of experts, a preprinted version of which is published on the scientific website ChinaXiv.
The experts said they used a mathematical model to analyze the possible start date of the coronavirus in the U.S. and the PRC, using data on the number of confirmed cases of infection.
“Based on analysis of data from 12 representative U.S. regions chosen to determine the date of the first infection, there is a 50 percent probability that the first infection occurred between August and October 2019. This is earlier than the officially announced date of the first confirmed case in the U.S., January 20, 2020,” the authors stated.
They claim that their analysis shows that it is highly likely that COVID-19 began spreading in the U.S. in September 2019, while in China itself, they say, the outbreak was not recorded until late December of that year.
Recall that in August, experts from the China Center for Disease Control and Prevention (CDC) announced a new version of the coronavirus in the city of Wuhan. According to them, the virus could have entered the country from other countries that sent products to China — the United States or EU member states.