Many people said this disease was caused by smell,but i really don't understand why when you watch the live or video ,they start clean throat or cough ? and also,those people who walk through my house,they will split cough etc.somebody can tell me what's going on? I'm so annoying about this f**king disease,cuz it has influence my life and work severely, I'm sad each day,and fear these f**king noise……i almost broken sometimes.