Wait wait wait...
You consider something a pandemic if you can see the virus isolated? Like in a petridish?
What, you think this is unusual?
Not surprising, based on your prior posts, so here it is.
Hw would your doctor know you actually have MRSA or strep throat or(perhaps closer to your own experience), syphilis or gonorrhea or chlamydia?
..... Yes. Yes it is unusual. Ok, you need to learn words. Go down to your local library. Ask them for a dictionary. And look up the word 'Pandemic'. Because you have no idea what it is.
As for how my doctor knows... Based on symptoms and possibly some chemical tests of my blood. Remember, doctors were diagnosing illnesses before the discovery of DNA. Which came before the electron microscope. Also, no doctor takes a swap, sends it to a lab where they filter out all but viruses, map each one's gnome, then check it via a database. Is that what you honestly think they do?