Although under the leadership of BA.5, the number of re -infections in the United States has surged, but this mutant strain does not lead to shortening the interval between the infection and the initial infection again, that is, these re -infections have not occurred at a faster speed.
Omikon BA.5 mutant strains spread faster and have stronger escape immunity. This will undoubtedly make more people infected. Even those who have already infected new crowns are difficult to avoid being infected again.
However, according to the data of the genetic testing company, although the number of people infected with the United States infected under the leadership of BA.5, this mutant strain will not lead to shortening the interval between the infection and the initial infection again, that is, these infections have not did not have no re -infection. Occurs faster.
A latest research analysis by gene sequencing company Helix states that during the wave of Omikon BA.2 in April this year, the average time between the same person's two new crown infection was about 230 days; Data show that the interval between the two new crown infection of the same person in the same person is about 270 days (about 9 months), that is, during the popularity of the BA.5 mutant plant, the frequency of the infection has not accelerated.
According to the latest data from the US Centers for Disease Control and Prevention (CDC), BA.5 has currently accounted for about 80%of new cases in the United States. Since March of this year, in the nearly 300,000 cases of infection cases, the proportion of infection has almost doubled, from 3.6%during the wave of Omikon BA.2 in May to the July BA.5 wave. 6.4%.
Some infectious diseaseologists told the First Financial reporter that the reasons for the re -infection of the new crown include factors such as weakening antibody immunity, faster virus transmission, and strengthening the previous immunity of BA.5 to escape.
Helix's latest data has also eliminated people's excessive panic about BA.5's super infectious power. "This does not mean that people will be infected again a few weeks apart, and this situation rarely happens in normal people." A public health expert told the First Financial Journalist.
The above experts also said that the longer the last time the last infection is, the greater the possibility of being infected again. The main reason is the attenuation of the antibody and the different immunity of the individual.
According to a recent research released by Qatar's 2.8 million residents, people who infected the mutated strains before the mutant strain infected with Omircor's mutant strain were only 15%of the symptomatic infection caused by the BA.5 mutant strain; and infected infection For those who have mutated strains before BA.5, the protection of the symptomatic infection caused by the BA.5 mutant strain can reach about 76%, suggesting that the new recent infection has a stronger protective effect on the re -infection. This study of Qatar is mainly under 50 years old.
In addition, based on the study of Denmark's research from November last year to February of this year, after the first infection, the number of secondary nucleic acid tests at a time interval from 20 to 60 days was only 187. 47 cases were infected with Omikon BA.1 mutant strains shortly after.
"In other words, if you have just been infected with a new crown, the chance of infection in the short term is very small, especially after vaccination." Professor Xu Jianqing, director of the infectious disease research institute in Shanghai, told the first financial reporter, " However, if you have not been vaccinated, those who have been infected with Omikon virus once need to resist the future infection. "