If you have no symtoms, clearly you do not need anything.....
If you have headache, muscle pain, coffing, difficulty breathing, no strength.... you decide if your body need some help to fight a battle or you may as well die of it
Natural selection
covid19 doesn't exist. So no. You need to change or add nothing.
And if your body is in such garbage condition that it dies to the flu then good.
Agreed, if you die for the flu, nothing will be lost
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