I'm in agreement wtih @yibg. > "You mean the natural selection of hosts, not viruses", No, just simply 'natural selection', as the overall process that determ

I'm in agreement wtih @yibg. > "You mean the natural selection of hosts, not viruses", No, just simply 'natural selection', as the overall process that determines which entities get to reproduce. Natural selection for the hosts is about their chances for reproducing (before dying from the disease). And in this case, we don't care about that since its a fair assumption that the patient is not having sex in ICU. :) Natural selection for viruses is about having the opportunity to jump hosts and replicate more viruses. The longer the host lives the higher the chances for the virus to propagate.