What is the risk of human-to-human transmission from positive international mail?
It is not ruled out that there will continue to be infected persons among the control personnel.
News from this newspaper (Reporter Sun Leqi) The Municipal Center for Disease Control and Prevention recently announced the traceability of the new outbreak in Haidian District: the case reported that he had recently sent and received international mail, and the possibility of contracting the virus through overseas items cannot be ruled out.
Jiang Chu, director of the Haidian District Center for Disease Control and Prevention, revealed that the transmission chain of the epidemic in Haidian District is clear, and the epidemic is expected to be brought under control in a short period of time.
Is the "human-to-human" situation of the new coronavirus common?
Jiang Chu said that the Haidian District Center for Disease Control and Prevention had not dealt with the case of human-to-human transmission of the new coronavirus.
CDC personnel have also detected the new coronavirus on mail packages, but at very low levels.
Generally speaking, the activity of the virus will be greatly reduced after 2 to 3 days of survival in the external environment.
And this mail, which was sent from Toronto, Canada on the 7th of this month, showed more virus volume and survival time during the detection process than previously recognized.
"It gave us a new understanding of the new coronavirus, and it sounded the alarm again."
On January 18, Haidian District reported 1 new confirmed case, a colleague who reported the new case on the 15th.
But before, it has not been centrally isolated and controlled as a close connection, which has confused many people.
Jiang Chu explained that the so-called high-risk groups refer to those who appear in the same poorly ventilated, small space and closed place within 3 hours to 1 day after the case or asymptomatic infection leaves, or who stay in the case or asymptomatic infection until they leave. Persons who are present in areas where contamination is likely to occur within the last 3 hours.
This is the case with the new cases on the 18th.
Without a history of direct contact, how did this case "get recruited"?
Jiang Chu revealed that the case had visited his office during the onset of the case on January 15.
Offices are mostly closed environments. In winter, for the purpose of keeping warm, the indoor fresh air volume is reduced, which may cause the virus to stay for a long time.
In addition, due to physical reasons, he failed to receive the new crown vaccine, which increased the risk of contracting the virus.
Jiang Chu said that the emergence of the case on January 15 has attracted the attention of the disease control department, worried that this case has no contact with high-risk groups, no history of living in medium-high-risk areas, or even outside Beijing. Many patients who did not surface.
But through careful epidemiology and advanced gene sequencing technology, the CDC quickly pinpointed the relationship between this case and the positive international mail.
Through personnel and environmental monitoring, disease control personnel found that the scope of contamination is small, and its transmission chain and contact methods are relatively clear.
Following the vines, effective management and control of close contacts, sub-close contacts, risk personnel and risk points were quickly carried out to avoid larger-scale transmission.
"In the next few days, it is not ruled out that there will continue to be infected people among the control personnel, but I think as long as the transmission chain is clear, it is very hopeful that the current epidemic will be controlled in a short time." Jiang Chu said.