According to the data of related papers, the proportion of asymptomatic infected people in the population ranges from 30-50% (not as high as we thought). However, most people are infected with Omicron, which is mainly mild and asymptomatic.
Recently, Academician Zhong Nanshan said that he expected to return to his pre-epidemic life in the first half of next year.
What is the proportion of asymptomatic virus strains in Omicron, and when will there be a wave of epidemic infection? Let's find out today.
Li Xiaowei | Author
Ivy, Xu Shilu? editor in charge
0 1
The number of people infected in the fog
Since the introduction of the "new ten" measures, free nucleic acids have been abolished in some areas of China. Many people self-test whether they are infected with COVID-19 virus through family antigens. Most mild patients choose to rest at home, while severe patients choose to go to the hospital.
However, at present, people who are positive for antigen self-test and choose to stay at home are not officially included in the number of confirmed cases. In addition, many people are asymptomatic and mild. This means that the number of socially infected people may far exceed the number of infected people notified daily.
2022- 12- 14 answer.
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What is the epidemic in COVID-19?
COVID-19 mutant, 202 1 May, 2002, WHO began to name COVID-19 strain with Greek letters, and named it 1 1 mutant, including α, β and δ. Mutant Mutant Mu The United States, Japan, and some countries in Europe and Latin America have reported cases of infection with the mutant Mu. According to WHO, although monitoring shows that the global epidemic infection rate of Mu mutant has declined, it is still on the rise in Colombia and neighboring Ecuador. [5]C. 1.2 Mutant The South African National Institute of Infectious Diseases has said that it is paying close attention to a new mutant named "C. 1.2" in COVID-19, which contains multiple mutations, and researchers suspect that it may have escaped the "attack" of some immune systems. On August 3, 20265438, local time, Margaret Harris, a WHO spokeswoman, said that WHO had contacted South African researchers to monitor and evaluate the mutant strain C. 1.2 in COVID-19, which was first discovered by WHO. At present, the mutant strain has not accelerated its spread, nor has it been listed as a "mutant strain that needs attention" by WHO. [3]B. 1.62 1 mutant 2021August 3 1 day, the World Health Organization reported that a COVID-19 mutant named "Mu" B.1.621was being monitored. 202 1 1 was first discovered in Colombia. [4] Sub-variant AY.4 According to the report of Indian Press Trust 20210125 October, Rakesh Mishra, former director of the Indian Center for Cell and Molecular Biology, said that there is no evidence that the sub-variant AY.4 of the COVID-19 Delta variant is more breakthrough or infectious to COVID-19 vaccine, and it [7] local time of ay.4.2 virus strain is 202 1, 1. 1On October 28th, Singapore's Lianhe Zaobao reported that the Ministry of Health of Singapore confirmed the discovery of a case of COVID-19. The case was infected with Delta strain AY.4.2 [8]. According to Reuters165438+1October 15, AY.4.2 is spreading rapidly in the UK, accounting for about 10% of all sequenced cases in the UK. Compared with the original Delta strain, AY.4.2 has two mutations in the spike protein used to infect human cells, and scientists are still studying the characteristics of this mutation. The British Health and Safety Agency said that they are paying close attention to the spread of AY.4.2. Although it is impossible to say whether this sub-variant will reduce the effectiveness of the vaccine, there are signs that AY.4.2 will be more contagious. According to the data of the World Health Organization, 42 countries, including the United States, reported the infection of AY.4.2 [10] B. 1.640 strain 202 1 year/month, and a new COVID-19 strain was found in Brittany, northwest France. [9] Delta mutant (evolutionary branch of AY.4) Warsaw strain 202 1 1 February1the State Council joint prevention and control mechanism press conference. According to the virology research results in National Health Commission, the viral genome sequence of local cases in Zhejiang (including Ningbo) is highly homologous to recent epidemic cases in Shanghai and Jiangsu. The case specimen of Ningbo CDC was sequenced for three generations, and the result was a Delta mutant (evolutionary branch of AY.4) Warsaw strain. [11] Omicron strain, a new variant of BA.2 subtype, with local time of 5438+ 10/0 on June 2022. The British Health and Safety Administration said that it is investigating the spread of the new variant of Omicron strain BA.2 in Britain, and the proportion of cases infected with this strain is still relatively low. The British Health and Safety Agency said that further analysis and research will be carried out on this mutant strain. By the end of June 2022, 65438+ 10/0, 53 cases of virus subtype BA.2 had been found in Britain. [12] On February 15, 2022, WHO pointed out in its weekly epidemiological report in COVID-19 that early research data showed that the mutant strain BA.2 of Omikrongya was easier to spread. According to the data of Danish epidemic situation, the infectivity of this subtype is 30% higher than that of the original strain BA. 1 of Biomijon, but the severity of the disease caused by this subtype is not different from that of the original strain of Omicron. [14] Omicron subtype variants BA.2. 12 and BA.2. 12./local time on April 3, 2022, the Department of Health of New York said that two new Omicron subtype variants ba.2./kloc were found in the state. [19] Omicron subtype strain BA.2. 12. 1 According to the report of Yonhap News Agency on May 3, 2022, BA.2. 12. 1 was produced in the United States and was called "invisible Omicron". According to reports, the transmission speed of BA.2 is 30% faster than that of Omicron, while BA.2. 12. 1 is 23%-27% faster than BA.2. The Central Anti-epidemic Countermeasures Headquarters of Korea said at the press conference that day that South Korea reported the first case of COVID-19 Omicron subtype strain Ba.2.1. The case is a 50-year-old woman who has completed three doses of COVID-19 vaccine. She arrived in Korea from the United States on April 16 and was diagnosed the next day. [27] Omicroclone recombinant strain-A "recombinant" of genetic information of subtypes Ba.1and BA.2 On April 28th, 2022, Sendai City announced that a new recombinant strain of COVID-19 Omicroclone virus had been detected among COVID-19 infected people in the city. [24] The results of genetic analysis showed that the strain was a "recombinant" which mixed the genetic information of Omicrovirus subtypes BA. 1 and BA.2, and its pathogenicity and infectivity were unknown. [23] This is different from the "XE" strain first confirmed in Japan, which was found in airport quarantine on April 1 1. [24] At the beginning of April, 2022, a case of Omicron XE was diagnosed by Brazilian Ministry of Health, which was a combination of BA. 1 and BA.2 recombinant strain [28] Omicron new variety BA. 1. 1 and BA.2 strain. On May 5, 2022, the Butan Institute, the Brazilian medical authority, confirmed that two cases of Omicron new variant infection were found in the southeastern state of S? o Paulo. The new Omicron variety is a combination of BA. 1. 1 and BA.2, and the Brazilian Ministry of Health has approved the new variety. [28] Omicron BF. 15 On August 29th, 2022, the Shenzhen Municipal Health and Health Commission said that the mutant strain BF.15 was found, which was a branch of BA.5.2. 1.
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