Low percentage of people infected with Omicron coronavirus mutant Medical data from South Africa, Denmark, and the United Kingdom may require hospital treatment compared to cases of Delta strains.
Findings by separate research teams raise expectations that there will be fewer cases of serious illness than those caused by other strains of the virus, but researchers say that Omicron’s high infectivity still burdens medical services. I warned that there is a possibility of calling.
Experts emphasized that the reduction in severe illness is likely due to a greater tendency of vaccination or Omicron to infect previously infected people compared to other variants, but a British study. Also suggested the possibility of an intrinsic reduction in severity.
The unvaccinated group remained at highest risk, but the majority of breakthrough infections and reinfections caused by Omicron were mild, so the proportion of all cases with severe disease was in other variants. Is lower than This strain currently accounts for the majority of Covid-19 cases in some countries. Including the United States..
According to an analysis of English data conducted by Imperial College researchers, Omicron is critical to a particular individual after adjusting for factors such as age, gender, underlying health, vaccination status, and previous infections. We found that it was 11% less likely to cause a disease.
At the population level, this means a 25% reduction in the risk of hospitalization compared to Delta, and Omicron cases are more likely to be among people infected or vaccinated earlier than Delta’s cases. Therefore, it decreases sharply. Provides substantial protection against severe illness.
Among those who tested positive in October and November, suspected Omicron cases made more adjustments than Delta’s, according to a South African study conducted by the National Institute of Infectious Diseases. Later, I found that I was 80% less likely to be hospitalized. Factors including previous infections. However, the researchers emphasized that the analysis did not consider vaccination status and that data on previous infections were unreliable.
A second analysis by the same research team now manages vaccination status, and once hospitalized, both Omicron and Delta cases in recent weeks are likely to progress to serious conditions. I understand. The analysis included over 10,000 Omicron cases and over 200 hospitalizations.
“Something is happening … Regarding the difference in immune response between Omicron and Delta,” said Professor Cheryl Cohen, an epidemiologist at the University of the Witwatersland and one of the authors of the study.
She found that breakthrough infections and reinfections from Omicron were “less serious” and that immunoprotection from T and B cells was “severe disease” of Omicron, despite reduced antibody protection. He said it suggests that he “mediated” the “progress to”.
Cohen said the reduced burden on hospitals allowed South Africa to handle omicron waves without imposing a blockade, but the findings may not apply to populous Western countries. Warned.
“What is it about [Omicron] From an absolute number perspective, it means that even very large numbers, and in some cases at low risk of serious illness, can cause serious public health problems. ” Added.
Apart from this, Danish data show that among those who tested positive between November 22nd and December 15th, Omicron cases could be three times more likely to be hospitalized than cases of other variants. Showed to be low. But experts warned that the concentration of omicron outbreaks in younger groups could distort the data.
Henrik Ulm, director of the Statens Serum Insect of Denmark, said: At a press conference on Wednesday.
However, there is still limited evidence of an essential reduction in severity, but this does not rule out Omicron, a previous infection or vaccine.
“For higher immunity avoidance of Omicron, this pattern [of fewer cases being hospitalised] Professor Samir Bhatt, a professor of machine learning and public health at the University of Copenhagen and a member of the SPI-M modeling group of the UK Government, said:
The UK Government is waiting for the latest data on the severity of Omicron Before deciding on further restrictions in the UK.. But Mr. Bat added that the UK approach is “pangrosian” and “exaggerates the hope that the mitigation of rigor brings.”
Professor Thea Corsen Fischer, Head of Expert Diagnosis of Viruses and Microbiology at the Statens Serum Insect of Denmark, said:
However, she added that policymakers need to be “a little careful to make a milder story,” as it will take “weeks” to reveal the effects of the variant on the hospital.
“I’m afraid of it because of the infectivity of Omicron … What we’re seeing now varies a lot in just about two weeks,” she said.
On Sunday, Denmark introduced a series of measures to contain it. Omicron spreadClosing theaters and museums, limiting the capacity of bars, restaurants and shopping centers.
Professor Peter Garred, a clinical immunological scholar at Rigshospitalet in Copenhagen, Denmark’s largest hospital, said the reduced severity could make a decision that countries such as the United Kingdom and the United States do not impose “nearly tolerable” restrictions. Stated.
“The question of whether Omicron is mild is not really reflected in the discussion of the new limitations. [in Denmark]”Gared said. “The government foresaw the problem because of the dramatic increase in infection rates, regardless of severity.”
Cohen of the University of the Witwatersland said the Omicron wave could “spread differently” in the Northern Hemisphere because it coincides with winter, but positive signs from South Africa are “many in other countries and their reactions.” Is relevant. “
“Most populations have previously been infected and / or vaccinated at this point,” Cohen said. “If it lasts, it is likely that all countries will see us a similar effect.”
Omicron cases unlikely to require hospital treatment, studies show
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