BA.2.76 mutant strain spreads less than 2 days to spread the 1st generation of mutant strains to be hidden in daily life?

Since the emergency response of Wenzhou City's immune -related flights on August 12, as of 16:00 on August 18, the input -input epidemic in this round has reported 61 positive infections. The virus gene sequences are BA.2.76 mutant strains.

On August 19, Zeng Daxian, the leader of the Wenzhou epidemic prevention and control expert group, said in an interview that combined with the epidemic situation across the country, the BA.2.76 mutant strain is currently the most contagious and fastest transmission strain. Among the "8.12 province's input epidemic" in Wenzhou City, three positive infected people on a plane transmitted 36 same flight personnel.

You can spread a generation in less than 2 days

Infected 1-2 days after being infected

Zeng Diandian said that the most obvious feature of BA.2.76 compared to other mutant strains in Omikon is: stronger infectious power and faster dissemination.

Judging from the situation of immune -related flights, three positive infected people were infected with 36 people on the same aircraft, and the seats of the three positive infected people were the same. Among the other infected people reciprocal.

In addition to the closed space of the cabin, there are also people infected by 3-5 meters apart because they have walked the same exit channel with positive infected people. They were infected less than 1 minute before and after.

Zeng Diandian analyzed that viruses were transmitted through air solution and long airplane time, unconventional masks, and failure for more than 4 hours, etc., all the causes of accelerated virus transmission.

In addition, from the perspective of the onset of positive infections, it is mainly the main infection of the upper respiratory tract, which is easier to copy and detoxify in large quantities. The incubation period is short. "BA.2.76 virus has a high load, and can spread a generation within 2 days."

BA.2.76 has no essential change, but the ability to escape from immune escape

On the afternoon of the 28th, Hou Binbin, a member of the Epidemic Prevention and Control Group of the Tibet Autonomous Region and deputy director of the District Centers for Disease Control and Prevention, said that according to relevant domestic and foreign information, the popularity and spread of the mutant plant of Omikon BA.2.76 Compared with other evolutionary branches, although there is no substantial change in nature, compared with the BA.2 strains that have been popular earlier, the propagation ability and immune escape ability have been enhanced.

There are several obvious features in all cases of infected people in this round of epidemic: First, the 20-60 years old among those with positive infections account for the majority. Essence Second, most of the new crown infections in the region are asymptomatic infections, but among those over 60 years old, the proportion of ordinary cases is significantly higher than that of other ages. Third, people with basic diseases or other diseases, clinical symptoms are heavier than other people. The fourth is that the vaccine population has mild clinical symptoms of clinical symptoms of vaccination or failure to complete the vaccine.

The mutant plant is hidden, and multiple rounds of nucleic acid sieve cases need to be used

Wang Mingzhai, chief expert of the new crown epidemic prevention and control center of the Xiamen Disease Prevention and Control Center, stated at a press conference on the Xiamen epidemic prevention and control on August 16 that according to public information at home and abroad, the transmission of BA.2.76 mutant strains is better than Omiko Rongjie variants. The plant BA.5 is stronger. In this epidemic, the mutant strain showed the characteristics of fast transmission, strong infectious power, and hiding. It takes 1 day from exposed to virus to the sampling of nucleic acid samples. Some people need 1 day, and some people need 3 days, 4 days, or even longer. In order to effectively discover those who are infected with new crown virus hidden in the community, multiple rounds of nucleic acids need to be continuously carried out. Test.

Luo Fei, chief physician of the Chongqing Centers for Disease Control and Prevention, introduced at the Chongqing Press Conference on August 27 that multiple rounds of nucleic acid testing in multiple temporary management and control areas in Chongqing recently. However, due to the characteristics of the virus, it is impossible to detect it once, twice, or even three times, and four times. As a result, some communities and buildings are constantly reported by new positive infections, and multiple rounds of testing may be required.

Regarding the characteristics of Omikon's mutant strain, Luo Fei held an example. It was mentioned that on August 24, Beibei District found two infected people in the central urban nucleic acid screening. Related risk personnel such as sub -intercourse were detected. Five positive personnel were found since the 25th, but in fact, the five people also participated in the nucleic acid screening on the 24th, and the result was negative. Because the virus has a growth process in the human body, if the virus load in the early stage of infection is lower than the detection threshold, it is difficult to detect positive. On the one hand, the screening of nucleic acid screening is very important. On the other hand, it is difficult to detect all positives through a screening due to strong hidden virus.

Therefore, he also reminded people who carried out two nucleic acid tests in 3 days, and the two sampling time intervals were at least 24 hours. As a result, they must be home and do not go out before they came out.

Make a mask for 4 hours to replace

Keep your social distance as much as possible for more than 2 meters

According to the characteristics of the BA.2.76 mutation strain, what are the main points of attention? Based on the recovery of this input epidemic, Zeng Dianxian gave important suggestions-

1. Make a mask for 4 hours to replace. He explained that the passengers on the plane were waiting to the airport, taking a plane, and landing. The time was over 4 hours, and the mask was not replaced. In an environment with a high virus load, the masks wearing the mask were basically invalidable. It's right. Therefore, when taking a plane and motorcycle, it is recommended to wear a mask above the medical surgical level to ensure that it is safe to be replaced for 4 hours.

2. Children should choose the right mask.Among the positive infections, children wearing N95 masks, but still infected.It is speculated that the face of the child is smaller. After wearing the N95 mask, it does not fit the face shape, which is not closed enough.Children should choose a mask that meets the requirements, and check whether it is closed after wearing.3. It is not enough to maintain a social distance of 1 meter. Try to keep it more than 2 meters.Due to the very strong infectious power of this variable plant, it is recommended to extend the social distance to ensure safety.

4. Try not to go to a closed place for the crowd.For example, in a similar epidemic, a case of infection with the elevator who takes the elevator when a positive infection is also infected.This shows that the risk of being infected in a closed space is very high.

5. Do your hand hygiene.In addition to the dissemination of the respiratory tract, the virus may also be spread through contact, so keep his hands frequently.

(China Xiaokang.com Comprehensive Wenzhou Release, Health Times)

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