> How quickly, versus natural evolution, can serial passage evolve a virus? Look how many infections were needed to go from Covid Classic to the Delta Variant.

> How quickly, versus natural evolution, can serial passage evolve a virus? Look how many infections were needed to go from Covid Classic to the Delta Variant. What's that a billion? Comment I read from someone that aught to know what they are talking about pointed out that gain function in a lab produces viruses that are good at infecting cells in petri dishes. Not ones that are good at infecting vertebrates with full fledged immune systems trying to kill it.