Absent any special considerations, that's the general direction that pathogens go, more infectious and less deadly. Dead hosts aren't a benefit to the virus, an

Absent any special considerations, that's the general direction that pathogens go, more infectious and less deadly. Dead hosts aren't a benefit to the virus, and neither are hosts too sick to go out and infect others. Evolution is messy though, I don't know how likely a particular new strain is to go that direction.