The BA.2 subvariant of the Omicron coronavirus variant, which has shortly taken over in Denmark, is extra transmissible than the extra widespread BA.1 and extra capable of infect vaccinated individuals, a Danish examine has discovered.
The examine, which analyzed coronavirus infections in additional than 8,500 Danish households between December and January, discovered that individuals contaminated with the BA.2 subvariant have been roughly 33 % extra more likely to infect others, in comparison with these contaminated with BA.1.
Worldwide, the “unique” BA.1 subvariant accounts for greater than 98 % of Omicron circumstances, however its shut cousin BA.2 has shortly turn out to be the dominant pressure in Denmark, dethroning BA.1 within the second week of January.
“We conclude that Omicron BA.2 is inherently considerably extra transmissible than BA.1 and that it additionally possesses immune-evasive properties that additional cut back the protecting impact of vaccination towards an infection,” the examine’s researchers stated.
The examine, which has not but been peer-reviewed, was carried out by researchers at Statens Serum Institut (SSI), Copenhagen College, Statistics Denmark and the Technical College of Denmark.
“You probably have been uncovered to Omicron BA.2 in your family, you could have a 39 % likelihood of being contaminated inside seven days. If you happen to as an alternative had been uncovered to BA.1, the likelihood is 29 %,” lead examine creator
That implies BA.2 is round 33 % extra infectious than BA.1, he added.
BA.2 circumstances have additionally been registered in the US, Britain, Sweden and Norway, however to a a lot lesser extent than in Denmark, the place it accounts for roughly 82 % of circumstances.
The examine additionally confirmed that BA.2 was comparatively higher than BA.1 at infecting vaccinated and booster-vaccinated individuals, indicating larger “immune evasive properties” of the subvariant.
However vaccines nonetheless performed an vital position, the examine underlined, since each booster-vaccinated and absolutely vaccinated people have been much less wish to get contaminated and transmit both subvariants, in comparison with these not vaccinated.
Preliminary evaluation by SSI has proven that there isn’t any distinction within the threat of hospitalization for BA.2 in comparison with BA.1.
The examine additionally confirms preliminary evaluation from England, which confirmed BA.2 seems to have a considerable development benefit over the BA.1 sort, in response to Britain’s UK Well being Safety Company.
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