According to the latest data from the U. S. Centers for Disease Control and prevention, 18 states in the United States have reported confirmed cases of infection with the Omicron strain. American experts pessimistically predict that the severity of this round of epidemic may be similar to that of last winter. At the same time, Arizona has also been hit hard by the epidemic recently, and there has even been a run on medical resources. Arizona Health Department data show that over the past weekend, more than 5000 new confirmed cases have been added for two consecutive days, the first time a similar situation has occurred since the peak of the epidemic in January this year.