Oh Ling I forgot. There is an autoimmune disease that affects the lungs and has to do with eosinophils and asthma like symptoms. It is called Churg Strauss (sp?). You might want to google it. I only know this because I have an autoimmune disease (not this one) and they checked for this by testing my eosinophil levels and other things. Also I was told not to take singular because that can cause churg strauss syndrome.