1. One reason why the epidemic situation in Shanghai is so serious: the source is Omicron mutant.
The source of this round of local epidemic in Shanghai is the environmental pollution caused by the virus (Omicron BA.2 evolutionary branch) carried by imported confirmed cases. Compared with Delta strain, Omicron mutant is more infectious, shorter incubation period, shorter passage time and more difficult to control.
The epidemic situation in Shanghai is so serious. Second, the process of isolating patients is too slow.
This round of local epidemic in Shanghai began on March 1 day, but it was not until the end of March that local residents were controlled on a large scale. On March 28th, Pudong was completely closed, and in April, 1 Nipu West was closed. This means that the epidemic has spread in the local area for a month before taking control measures, which is also a very important reason for the serious epidemic.
There are three reasons why the epidemic situation in Shanghai is so serious: management negligence leads to a large-scale outbreak.
Because of the management negligence at 1200 Caoxi North Road (Hua Ting Hotel), it gradually spread. However, there is a ventilation duct in the internal ventilation system of Hua Ting Hotel, which causes asymptomatic infected people to spread the virus through the ventilation duct. In just ten days, there were 548 asymptomatic infected people, and the number was amazing, but the local epidemic prevention and control measures were not strict at that time.
The epidemic situation in Shanghai is so serious. Four reasons: most people are asymptomatic.
During the end of March, according to the new epidemic notified by the Shanghai Health and Health Commission, thousands of asymptomatic people were infected every day. Among them, there were 5656 cases of asymptomatic infection on the 29th and 5298 cases of asymptomatic infection on the 30th in Shanghai. The reason why there are so many asymptomatic infected people in Shanghai is mainly related to the characteristics of Omicron variants, whose toxicity is relatively weakened and clinical symptoms are relatively mild, which will lead to many infected people having no clinical symptoms after infection.