When you feel that you are down with something, you tend to have the idea “now I don’t feel so good” and “this is not so good” and “I have to fix this somehow”.
While it’s certainly beneficial to recover from a flu, it’s not beneficial to classify this type of chemical activity (which we feel like a cold or like a flu) as bad. Everything we experience happens due to that same kind of function at the level of proteins.
So instead, these situations where we become more aware of the protein level activity in our physical body, we could use them as reminders about the magic of life.