Although the treatment options have increased, and the virulence of Omicron variant decreased significantly, the infection still causes deaths among the most vulnerable population². An undiagnosed heart condition associated with adrenergic stimulus caused by high-intensity exercises can lead to sudden cardiac death³. So it’s still important to protect ourselves to avoid infection or reduce the infection times under the new prevention and control measures.

In conclusion, the adjustment on the prevention and control measures resulted in rapid increase of SARS-CoV-2 infection rate among hospitalized children through the first three weeks, and it took nearly eight weeks for the infection to recover to the rate at the beginning of the adjustment. Continuous monitoring of the infection is required in the future to help reduce the infection.