1 According to a recent study by the National Cancer Institute (INT) in Milan, Italy, COVID-19 began to spread in Italy on September 20 19, much earlier than the outbreak in Wuhan. Compared with the first Italian case of COVID-19, it appeared five months earlier, namely 5438+0 on February 26th, 2020.
2. The University of Barcelona announced that the researchers of the Enterovirus Group of the University of Barcelona had tested the local wastewater samples and found that COVID-19 was found in the wastewater collected in March 20 19 and 12.
3. According to the research report published by researchers from the Centers for Disease Control and Prevention, as early as 2065438+2009,65438+mid-February, COVID-19 appeared in the United States, which was one month earlier than the first confirmed case in the United States and several weeks earlier than the official diagnosis of COVID-19 in China. In addition, according to American media reports, michael mayer Hamm, the mayor of belleville, New Jersey, said that he was infected with COVID-19 virus on 20191.