How did the Xiaogan epidemic happen?

The epidemic in Xiaogan was discovered on August 30th, and there was a new asymptomatic local infection, and then people were infected continuously. According to the relevant data, asymptomatic infection means that the nucleic acid test is positive and novel coronavirus is found in the body, but there is no clinical manifestation. Asymptomatic infected people are called pathogen carriers from the perspective of infectious diseases, and there will be the phenomenon of human-to-human transmission. By September 26, 2022, 3 158 people had been diagnosed in Xiaogan, and there was no increase in the past week.