看来还是和天气有关，
文章来源: 胡雪盐8 于 2023-09-11 09:44:38

A map shows the amount of COVID-19 test positivity across the United States in the week ending September 2. Green signifies a positive test rate of 5 to 9.9 percent; yellow from 10 to 14.9 percent; light orange from 15 to 19.9 percent; and dark orange is 20 percent or more.