Ascariasis starts with contact and ingestion of roundworm larvae. This kind of parasite is the most common cause of roundworm infection in the world. Most infections are mild, but there are cases where the infestation and symptoms are severe. The larvae continue to grow in the small intestine and may travel through the bloodstream or lymphatic system, proceeding to the lungs. Symptoms are comparable to asthma or pneumonia and include coughing, wheezing, and trouble breathing.
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