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Filariasis is a filarial infection caused by parasitic nematodes (roundworms) spread by different vectors. They are included in the list of neglected tropical diseases . The most common type is lymphatic filariasis caused by three species of Filaria that are spread by mosquitoes .
The microfilaria (plural microfilariae, sometimes abbreviated mf) is an early stage in the life cycle of certain parasitic nematodes in the family Onchocercidae. [1] In these species, the adults live in a tissue or the circulatory system of vertebrates (the "definitive hosts"). They release microfilariae into the bloodstream of the vertebrate host.
Loa loa is a filarial (arthropod-borne) nematode (roundworm) that causes Loa loa filariasis. Loa loa actually means "worm worm", but is commonly known as the "eye worm", as it localizes to the conjunctiva of the eye. Loa loa is commonly found in Africa. [2] [page needed] It mainly inhabits rain forests in West Africa and has native origins in ...
Loa loa life cycle. Source: CDC. During a blood meal, an infected Chrysops fly introduces third-stage filarial larvae onto the skin of the human host, where they penetrate the bite wound. The larvae develop into adults that commonly reside in subcutaneous tissue. The female worms measure 40 to 70 mm in length and 0.5 mm in diameter, while the ...
Various filarial diseases specific to humans are candidates for elimination by such means as breaking the cycle of infection. To eliminate the vectors is not really practical, but if the human population were sufficiently cleared of parasites by treatment with filaricides then one year without any human reservoirs of infection should suffice to ...
Wuchereria bancrofti is a filarial (arthropod-borne) nematode (roundworm) that is the major cause of lymphatic filariasis.It is one of the three parasitic worms, together with Brugia malayi and B. timori, that infect the lymphatic system to cause lymphatic filariasis.
The complete cycle takes 2–6 wk, and is dependent on environmental conditions. The females usually bite around dawn and dusk, although often at other times. Eggs are laid 3–4 d after the blood meal, and about 70-180 eggs are laid each time. Moisture is essential for the vector, and the development of its eggs and larvae.
Brugia timori is a filarial (arthropod-borne) nematode (roundworm) which causes the disease "Timor filariasis", or "Timorian filariasis".While this disease was first described in 1965, [1] the identity of Brugia timori as the causative agent was not known until 1977. [2]