65438+20201October 2 1. The so-called epidemic situation is characterized by the rapid spread of the virus, heavy casualties, great difficulty in control and wide geographical area. According to the inquiry, the United States reported the first case of COVID-19 on June 5438+1October 2 1 day, and the first case of COVID-19's death on February 29, 2020. On March 23, 2020, the number of people who died in COVID-19 has exceeded all the deaths caused by air crashes in the United States in the past 20 years.