On November 24, Qiu Jingfu, dean of the School of Public Health of Chongqing Medical University, said at a press conference on the prevention and control of the new crown pneumonia epidemic in Chongqing that since the outbreak of this round of epidemic in Chongqing on November 1, the epidemic has spread rapidly and spread widely. , the transmission chain is complex, the number of new infections remains high, the epidemic situation is extremely severe, and prevention and control are extremely difficult.

  According to Qiu Jingfu, through the analysis of some rheology data and some positive nucleic acid results, it was found that the epidemic strain Omicron BA5.2 has some characteristics different from those of previous epidemic strains in the transmission mode. The first characteristic is that human infection The initial viral load is relatively large, and the threshold Ct value of the number of cycles in the nucleic acid test results is low. The Ct value of most infected persons is between 10 and 20, indicating that the infected person carries a large amount of virus in the early stage of infection, and a large carrying amount means that there are more Possibility of transmission; the second feature is that there is epidemiological evidence that the current round of popular Omicron BA5. It is easy to spread rapidly in humid, closed and crowded spaces and can quickly cause a large number of people to be infected.

(Jing Shiyan)

Responsible editor: [Ye Pan]