Most cases (89.15%) concentrated in Qingcheng district, Qingxin County, Lianzhou city and Yingde city which have most permanent resident population and floating population.

• 病例主要集中在常住和流动人口较多的清城区、清新县、连州市、英德市4个县（县级市、区），占全市发病数的89.；15%25；