[HIGHLIGHTS] "Omicron variant "BA.5" strain difficult to grow at high heat" The University of Tokyo, etc.

Group created lung cells from human iPS cells and infected them with the Delta and Omicron variants BA.5 and BQ.1. At 37 degrees Celsius, which is close to normal, the number of mutated viruses increased 2,10 to 100 million times after two days.

At 40 degrees, the Delta variant increased as it did at 37 degrees, but the increase inBA.5 was only 1000,1 times. The nature of the new coronavirus may have changed over the past three years.