Those who study and gaze at the stars and heavens tell us that the one constant we can find in our firmament is the air we breathe. The basic molecules in the air are the same they were for a very long time. Thus they dreamily opine that the very air we breathe could be the same one as breathed in or exhaled by those who came before us.
Like an Einstein? Why not. After all, we air-breathing mammals use air like it is literally going out of business. How many times do we breathe in and out each day? In my advanced stage, I can only hold without breathing for under 2 minutes.
Not knowing enough of the current pandemic scourge, what is to say that it is not in the very air we are now breathing? That maybe the situation is that some of us simply are susceptible, or some are infective, or others resistant?
The last global pandemic (the Spanish flu in 1918) killed millions around the globe. Is the virus that caused it gone? No scientist is claiming that. And it holds true for the other viruses that have plagued man in all of recorded history.
So?
If so, no amount of preparation, however detailed, minute or grand, could guarantee that each of us could not get it.
Let us just all be sensible. As sensible as we each individually understand and could prevent it. As they say, only God knows.
Or said differently, not to agonize too much over future ills or problems, sufficient are the problems of the present.