1.   In less severe infections the adult worms cause a haemorrhagic tracheitis with excess mucus production which leads to partial occlusion of the airways and difficulty in breathing.

2.   The first easily recognized sign of COPD is a chronic cough with excess mucus production.

3.   Those symptoms include the large buildup of excess mucus in the airways and chronic inflammation of the lungs.

4.   Asthma is a chronic disease in which airflow in and out of the lungs may be blocked by muscle squeezing, swelling and excess mucus.