One strawberry is hardly anything to beat yourself up about; one box of strawberries is something that should cause concern! Don’t worry about it because your body should easily get over any bad effects found in the strawberry.
Be sure to rinse it very thoroughly before eating because strawberries and raspberries are rather high in mold content while blueberries are low in mold content. For instance, if you left a box of strawberries on a window sill one day it would turn moldy fast!
Keep it up orka and try to get in some antifungals as you can handle it!