There are many new features in the COVID-19 epidemic in the United States, which means that the American epidemic has many features and cannot explain the characteristics of virus variation. Subscription On August 9th, there were more than 53,000 confirmed cases and 6,543,800 deaths in COVID-19. It only took 17 days, and the number of confirmed cases increased from 4 million to 5 million, with COVID-19 accounting for 25% of the total number of confirmed cases in the world. American epidemiologists believe that the COVID-19 epidemic in the United States has several new features: 1, and the number of deaths continues to increase; 2. The virus has spread widely, and the number of new cases has increased sharply in many places; The infection rate of young people has increased. According to the real-time epidemic surveillance system of Johns Hopkins University in the United States, as of 5: 27 pm EST on August 14, there were 5,297,876 cases of COVID-19 infection in the United States, including 168 1 case of death. Compared with the data of the system 24 hours ago, there were 57,226 infections and 65,438+0,225 deaths in COVID-19.

In the final analysis, these three new features of the American epidemic are due to the government's inaction and failure to take effective publicity and preventive measures. Moreover, because they don't know enough about the epidemic, many Americans still refuse to accept the prevention and control of the epidemic because of their so-called freedom and ignorance. They think that restricting travel and requiring wearing masks are a denial of human rights. Because the seriousness of the epidemic can't be concealed after all, Trump has to let go and admit that the epidemic problem is indeed a bit serious. However, because of the ongoing presidential election, Trump still does not recognize the mistakes of the US government in epidemic prevention and control. In addition, the Democratic Party and the * * * Party compete with each other, and each state is in power independently, which makes it impossible to uniformly implement epidemic prevention and control measures.

However, this does not necessarily mean that there is no mutation in COVID-19. Theoretically, all viruses can mutate, especially RNA virus, and coronavirus is an RNA virus. For coronavirus, more mutations can be detected in some hypervariable regions of virus gene, which often affect the affinity of virus to host receptor and the immunogenicity of virus. This immunogenicity is the ability to trigger the immune protection response of the body, which may lead to the virus acquiring new capabilities, such as the ability to infect new hosts and escape adaptive immune protection. According to the paper published by Chinese Academy of Sciences, through the molecular evolution analysis of 103 novel coronavirus genomes, it was found that novel coronavirus recently produced 149 mutation points, which evolved into two subtypes, and1065,438+0 all belong to these two subtypes. One is subtype L and the other is subtype S, which is more aggressive and contagious.

Therefore, if the United States does not control the spread of the epidemic, the harm of COVID-19 will be very serious in the future.