AFAIK there was a correlation in some countries between COVID outcome and deworming meds. In those countries people actually had worms, which weakened the immune system, so taking deworming meds in the end helped with COVID by removing the worms. Obviously it doesn’t do shit if you don’t have worms.

lung/throat/breathing area (don’t know the medical term for the area)

The term you’re looking for is respiratory system, although COVID wasn’t just a respiratory disease.