Unfourtuantly, this correlation is not always the case.
HIV is extremely deadly without treatment, but has an asymptomatic stage that can last over a decade despite still being infectious during that time.
The silver lining with HIV is that its modality of transmission is primarily sex and blood, which greatly limits the number of contacts an infected individual will have.
An airborne disease with the lethality, incubation length of infectivity, and vaccine resistance of HIV would be a slow moving disaster of an unimaginable magnitude.
I am not aware of any theoretical reason such a disease cannot exist.
HIV is extremely deadly without treatment, but has an asymptomatic stage that can last over a decade despite still being infectious during that time.
The silver lining with HIV is that its modality of transmission is primarily sex and blood, which greatly limits the number of contacts an infected individual will have.
An airborne disease with the lethality, incubation length of infectivity, and vaccine resistance of HIV would be a slow moving disaster of an unimaginable magnitude.
I am not aware of any theoretical reason such a disease cannot exist.