lymph node with filaria worms, concept of elephantiasis, or lymphatic filariasis

accumulated animal blood chronic condition disease disorder drainage edema elephantiasis filariasis fluid gross health healthcare illustration insect insectborne larva leg limb lymph lymphedema lymphoedema medical medicine microfilaria microfilariae mosquito mosquitoborne nematode parasite parasites parasitic parasitism swelling swollen system tropica unhealthy wildlife worm