Short answer: Probably not.Longer answer: Probably not, and even if it has, it might not be dangerous enough to do real damage given how much immunity the population now has.I wrote about the new Omicron subvariants, BA.4 and BA.5, a few weeks ago. Early indications are that they’re more contagious than the current dominant subvariant in the U.S., BA.2.12.1, which is more contagious than the original Omicron, which was itself insanely contagious. Worse, because natural immunity from Omicron appears to last only a few months, a prior infection is no real defense to BA.4 and BA.5. In fact, the two...