So COVID-19 is ( paraphrasing the simpler version from Don)  "attaching to human cells by utilizing BRD-4 ... After it’s attached, it uses human receptors, one of them called ACE2 and another TMPRSS2, and.... Apabetalone causes a huge reduction of ACE2 and some other receptors,  as they are inflammatory markers..."

So my question is... how common is this pathway among viruses? Is it common among the whole family of corona viruses? Is it rare and unique to COVID-19?

Because IF this is a common pathway for a whole herd of infectious viral (or maybe even other) agents, the implications of these findings could be more significant than if it is only applicable to COVID. 

We are at a time in history when it is not uncommon to see predictions of novel bacteria, viruses, and other infectious agents. This compound does not seem to rely on the specific RNA of an infection. So the question as to whether the pathway is common or unique to covid would have bearing on whether this could be protective against a broader spectrum of potential agents - either before or during infection.

Hope that makes sense. 

Does anyone know?

Tnx