The massive swelling of the tissue in the disease elephantiasis is due to the blockage of the lymphatic vessels because of the worms.
Elephantiasis is a disease caused by a parasitic nematode called Wuchereria bancrofti. Since the lymph vessels are affected in this disease, it is also called lymphatic filariasis. The transmission of the nematode happens due to the mosquito bite.
Lymphatic vessels are the part of the lymphatic system that carry lymph fluid across the whole body. These are the network of capillaries (micro-vessels) and a large network of tubes located throughout the body. The vessels join the larger vessels called collecting duct.
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