The BA.2 subvariant of the Omicron coronavirus variant, which has quickly taken over in Denmark, is more transmissible than the more common BA.1 and more able to infect vaccinated people, a Danish study has found. | Reuters
The study, which has not yet been peer-reviewed, was conducted by researchers at Statens Serum Institut , Copenhagen University, Statistics Denmark, and Technical University of Denmark.
“If you have been exposed to Omicron BA.2 in your household, you have 39% probability of being infected within seven days. If you instead had been exposed to BA.1, the probability is 29%,” lead study author Frederik Plesner told Reuters.BA.2 cases have also been registered in the United States, Britain, Sweden, and Norway, but to a much lesser extent than in Denmark, where it accounts for roughly 82% of cases.
The study also showed that BA.2 was relatively better than BA.1 at infecting vaccinated and booster-vaccinated people, indicating greater “immune evasive properties” of the subvariant. But vaccines still played an important role, the study underlined, since both booster-vaccinated and fully vaccinated individuals were less like to get infected and transmit either subvariants, compared to those not vaccinated.
Preliminary analysis by SSI has shown that there is no difference in the risk of hospitalization for BA.2 compared to BA.1.The study also confirms preliminary analysis from England, which showed BA.2 appears to have a substantial growth advantage over the BA.1 type, according to Britain’s UK Health Security Agency.
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