According to a study conducted in Denmark, a sub-variant of the highly contagious Omicron coronavirus strain is even more contagious than the original version.
The researchers examined the transmission of the omicron subvariant BA.2 versus BA.1 in 8,541 Danish families and 17,945 household members.
The peer-reviewed finding posted on the preprint repository MedRxiv indicates that the rapid spread of BA.2 may be related to the sub-variant’s inherently increased transmissibility.
There is also evidence to support the immune degrading properties of the BA.2 sub-variant, the researchers said.
“The study found an overall secondary attack rate of 39 percent in BA.2-infected homes compared to 29 percent in BA.1-infected homes,” researchers from the Statens Serum Institute (SSI) said in a statement.
“Both BA.2 and BA.1 vaccinated households and uninfected individuals had a higher risk of becoming infected than booster-vaccinated household members,” he said.
According to the researchers, this underscores the positive effect of vaccination against both Omicron variants.
When comparing BA.2 relative to BA.1 infected families, there was an increased risk of infection in BA.2 infected families regardless of the vaccination status of the potential secondary case, which is the underlying increased transmittance of the BA.2 sub-variant. Indicates capability. , They said.
The study also found that non-vaccinated BA.2 primary cases transmit the infection to a higher level than BA.1 primary cases, both to vaccinated and booster-vaccinated household members.
The researchers said that vaccinated individuals infected with BA.2 transmit less than individuals vaccinated with BA.1.
The study authors said, “We concluded that Omicron Ba.2 is significantly more permeable than naturally occurring Ba.1, and also has immunosuppressive properties that further reduce the protective effect of vaccination against infection.” Huh.”
In addition to SSI, the team also included scientists from the University of Copenhagen, Statistics Denmark and the Technical University of Denmark.
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