Feature 1: The communication chain is mainly concentrated on "two lines".
One is the "morning tea spreading chain" that spread from Liwan District of Guangzhou to Maoming and Foshan, and the other is the "overseas freighter spreading chain" that took place in Yantian Port of Shenzhen. On May 29th, Nanhai District, Foshan City reported a new confirmed case 1 case, and 2 asymptomatic infection cases, which were not found in the population under the management of close contacts, but in large-scale nucleic acid screening. Does this mean that a new communication chain has emerged? We also need to wait for the reconciliation and traceability of traffic.
Feature 2: Strong regional agglomeration.
Experts pointed out that there is a certain degree of regional aggregation of infected people. Close contact and close contact involve many areas in Guangzhou and Foshan. The complex types of activity places increase the risk of community communication.
Feature 3: Fast propagation speed.
Some media combed the transmission chain and found that in less than 10 days, there have been five generations of transmission cases in Guangzhou, which proves that the intergenerational transmission time of the virus is constantly shortening.
Feature 4: Mutants bring new challenges.
In this round of Shenzhen epidemic, the infected strain belongs to COVID-19 mutant strain found in Britain, while several confirmed cases in Guangzhou were infected with Indian mutant strain. In this regard, experts from Guangzhou CDC also said that we are at a critical moment in the race against the virus.
Experts say that accelerating vaccination promotes group immunity:
Recently, several virus variants imported from abroad were found in Guangdong, involving Britain, South Africa, Nigeria, Brazil and India. The outbreak in Shenzhen was caused by a mutant strain first discovered in Britain. Among the infected people in Guangzhou, all the mutants were found in India for the first time (B. 1. 17).
"For viruses, change is normal, and unchanging is abnormal." Zhang Xiaoliu, a tenured professor at the University of Houston and director of the Center for Receptor and Cell Information Transmission, believes that it is not very strange that the virus has become stronger. This is a question of probability, and it will happen sooner or later. We need to take virus mutation as the normal state, and it is expected that more mutations will appear continuously.
"Although this virus is highly contagious, the route of transmission has not changed much. Respiratory transmission is still the main route, and contact transmission is the secondary route. " Cai Weiping, director of the Center for Infectious Diseases of the Eighth People's Hospital of Guangzhou, said that people should pay attention to this epidemic, but don't panic too much. In treatment, timely oxygen therapy is still the most effective method.
He Jianfeng, chief expert of Guangdong Provincial Center for Disease Control and Prevention, said that the global epidemic will continue to spread at a high level, and the pressure on China to prevent overseas imports is still enormous. Virus variation is a key variable affecting global epidemic prevention and control. In the face of the ever-changing virus, it is very important to improve the national vaccination rate as soon as possible and accelerate the construction of the domestic group immune barrier. When the immune barrier is established, even in the face of stronger mutant viruses, we will have a good basis for coping.
Refer to shenyang evening news for the above content-be alert! This round of Guangdong epidemic has four characteristics.