Which parasitic disease is confirmed by the presence of adult worms in tissues?

Filariasis is associated with the presence of adult worms, specifically filarial worms, in the tissues. The disease is caused by various species of parasitic nematodes, such as Wuchereria bancrofti, Brugia malayi, and Loa loa. In the case of filariasis, adult worms reside in the lymphatic system, leading to conditions such as lymphatic filariasis, which can manifest as severe swelling and fluid accumulation in affected areas, often resulting in elephantiasis.

In contrast to filariasis, other mentioned parasitic diseases have different characteristics. For example, ascariasis primarily involves the presence of adult roundworms (Ascaris lumbricoides) in the intestines, while schistosomiasis is caused by trematodes that primarily inhabit blood vessels. In schistosomiasis, adult worms can be found in the mesenteric veins, but the diagnosis typically relies on the detection of eggs rather than the adult worms themselves. Trichinosis is caused by the larval stage of the Trichinella spiralis worm found in muscle tissues, but it is not characterized by the presence of adult worms in tissues. Thus, filariasis is uniquely identified by the presence of adult