BA.2.75, which is one of the Omicron strains of the new coronavirus and has been detected in Japan, is 1.14 times more likely to spread than BA.5, which is currently the main infection. The analysis was published by a group led by Professor Hiroshi Nishiura of Kyoto University.
A group led by Professor Nishiura of Kyoto University and Professor Kimito Ito of Hokkaido University, based on the data of BA.2.75 and other mutant viruses reported in India from May to early last month, predicted the spread of infection. analyzed the difference.
As a result, the "effective reproduction number" of "BA.2.75", which indicates how many people one person infects, is currently 1.14 times the number of "BA.5", which is estimated to account for most of the infections. It was estimated to be 1.36 times the "BA.2" that was the mainstream in the sixth wave.
The group analyzes that although it is unlikely that "BA.2.75" will expand rapidly in Japan, it will gradually replace it.
Professor Nishiura said that the ease of spreading compared to previous viruses is "to a minor extent", but "currently we are not able to ascertain how many people are infected with 'BA.2.75' in Japan. , I have to gather information with a sense of vigilance."