What is immune system?
I reckon...
Do you often catch a cold in the winter?
Frankly speaking...
Have you ever had influenza (flu)?
(Positive) I guess so.../ (Negative) Not that I can recall...
How to differ the coronavirus from the flu?
In my limited experience...
Is flu dangerous?
I bet...
What’s the difference between having the flu and having a cold?
As far as I'm concerned...