BA.2.75, which is one of the Omicron strains of the new coronavirus and has been detected in Japan, is currently being tested in animal experiments to show that the immunity created by infection with BA.5, which accounts for almost all of them, is ineffective. The results were published by groups such as the University of Tokyo.
This research was published as a paper before it was peer-reviewed by a third party by the research group "G2P-Japan" led by Professor Kei Sato of the Institute of Medical Science, the University of Tokyo.
In a group, we used the blood of hamsters infected with "BA.5" to examine the function of neutralizing antibodies that suppress the virus. I was down to 1.
In addition, in order to investigate pathogenicity, hamsters were infected with the actual virus, and in the case of "BA.2.75", the values indicating tracheal inflammation and lung damage were about the same as "BA.5". is.
On the other hand, when we created a virus that reproduced the characteristics of ``BA.2.75'' and examined the function of the neutralizing antibody obtained from the vaccine using the blood of a person who had been vaccinated three times, we found ``BA.2''. I assume it was about the same.
Professor Sato said, ``There is a possibility that the neutralizing antibody produced by infection with ``BA.5'' may not be effective against ``BA.2.75''. I have a nature,” he says.