Novel coronavirus pneumonia was diagnosed in 6330286 cases around 6:30 Beijing time in September 4th, according to Worldometer real-time statistics. 190936 cases died in total. Compared with the data at 6:30 on the previous day, 34576 new confirmed cases and 1053 new deaths were recorded in the United States. < / P > < p > with the arrival of the school season in the United States, the epidemic situation in American schools is becoming more and more serious, and there are frequent mass infection incidents in Colleges and universities, as well as the problems of primary and secondary school students and preschool children. Novel coronavirus pneumonia is diagnosed in nearly 180 thousand children in the United States from July 9th to August 6th, the growth rate is 90%, the US News and world report points out. However, during this period, in order to promote the process of returning to school, US President trump still wrote on the social platform that children are “almost immune” to the new coronavirus. George Benjamin, executive director of the American Public Health Association, believes that the economic activities of states in the United States are restarting, and there will be Labor Day holiday on September 7 soon. Teachers and students will return to school one after another, and we are likely to see a rebound of the epidemic again.