#3 sounds both plausible and absolutely dreadful to me (I’m in Sweden where the de facto “strategy” is still herd immunity)... #1 and #2 sound not entirely imp

#3 sounds both plausible and absolutely dreadful to me (I’m in Sweden where the de facto “strategy” is still herd immunity)... #1 and #2 sound not entirely implausible to me though... Severity of disease seems to vary a lot with infection dose. Is it really that far fetched that when infection doses are very low the disease is mild, but as the virus level in the population rises and infection doses go up the disease becomes a very serious public health issue? Does anybody know any data that supports/refutes my thinking above?