(Paris) Two studies published on Tuesday claimed that the “British” variant of the Coronavirus does not cause more severe forms of the Coronavirus, contrary to the results of previous research, but they confirm that it is much more contagious than previous strains.
The authors of the first study published in Infectious Diseases LancetIn, it analyzed data on 341 patients from COVID-19 who were hospitalized in London between November 9 and December 20, with the 501Y variant emerging. V1, now dominant in most parts of Europe.
58% of them were infected with this variant, also known as 1.1.7 and 42% with other strains.
36% of patients in the first group became seriously ill or died, compared with 38% in the placebo group, indicating that B.1.1.7 is not associated with greater severity.
However, the researchers showed that samples taken from patients infected with the variant contained, on average, a greater amount of the virus, indicating a higher susceptibility to transmission.
The second study published in Lancet Public HealthIn this article, they analyzed data from nearly 37,000 British users of a mobile app designed to report symptoms of COVID-19, who were diagnosed between September 28 and December 27.
Out of the number of people reporting symptoms each week in a given area, I concluded that the “British” variant has a reproduction rate 1.35 times higher, meaning that each infected patient is infected on average 35% more than the previously distributed people. Virus strains.
However, the alternative did not cause more severe symptoms or a greater likelihood of long-term symptoms (“long-term COVID-19”).
Commenting on the first study, three researchers from the National Center for Infectious Diseases (NCID) in Singapore indicated that its results contrast with three previous research papers, linking the “British” variant with a higher likelihood of death and acute forms. From COVID-19.
They note that the study published in Lancet It has the advantage of using the complete sequence of the virus in its analyzes, but its reassuring conclusion must be “confirmed” by larger studies.
“This study focuses on the clinical outcomes of a group of people who have already been hospitalized with COVID-19,” notes epidemiologist Nicholas Davis, however, citing the British Science Media Center.
It “does not contradict the elements already collected through previous studies,” which tend to show that “B.1.1.7 infection is globally associated with an increased risk of mortality, hospitalization, and admission to hospitals.” Emergencies among all individuals who test positive for SARS adds. CoV-2