Indeed, from the primordial alpha variant to the delta variant to omicron, new variants emerge when unique mutations make a strain either more contagious, or more capable of evading immunity from previous infections and vaccines.
"The omicron sub-variant BA.5 is the worst version of the virus that we've seen."."The omicron sub-variant BA.5 is the worst version of the virus that we've seen," Dr.For the delta variant, which became the most dominant variant in late 2021, it had an R-naught of about 7?The first version of omicron was estimated to have a R-naught value of 9.5, meaning one infected person would, in an uncontrolled situation, spread it to an average of 9.5 others.