Which are host factors of filariasis?
Aedes and Mansonia can transmit the infection in the Pacific and in Asia. Many mosquito bites over several months to years are needed to get lymphatic filariasis. People living for a long time in tropical or sub-tropical areas where the disease is common are at the greatest risk for infection.
What is the intermediate host of Brugia malayi?
Intermediate hosts include species in the genera Mansonia, Aedes, Anopleles, and Culex. During the mosquito’s blood meal the larvae enter the wound of the definitive host, which consist of humans, monkeys, domestic cats, and forest carnivores.
Which nematode causes filariasis?
Filariasis is a rare infectious tropical disorder caused by the round worm parasites (nematode) Wuchereria bancrofti or Brugia malayi. Symptoms result primarily from inflammatory reactions to the adult worms. Some people may also develop hypersensitivity reactions to the small larval parasites (microfilariae).
What is the pathogen of filariasis?
Most cases of filariasis are caused by the parasite known as Wuchereria bancrofti. Culex, Aedes and Anopheles mosquitoes serve as vector for W. bancrofti in transmission of the disease. Another parasite called Brugia malayi also causes filariasis is transmitted by the vector Mansonia and Anopheles mosquitoes.
What is the meaning of host factor?
Host factor is a medical term referring to the traits of an individual person or animal that affect susceptibility to disease, especially in comparison to other individuals.
What is nocturnal periodicity what is its significance in diagnosing filariasis?
The microfilariae that cause lymphatic filariasis circulate in the blood at night (called nocturnal periodicity). Blood collection should be done at night to coincide with the appearance of the microfilariae, and a thick smear should be made and stained with Giemsa or hematoxylin and eosin.
What is the life cycle of Onchocerca volvulus?
The larvae develop into adult worms in the nodules. Adult females may live up to about 15 years in these nodules. 4. After mating, mature female worms produce eggs, which develop into immature forms of the worm called microfilariae.
Is the nematode which required arthropod as an intermediate host to complete the life cycle?
The nematode Abbreviata hastaspicula (Spirurida: Physalopteridae) occurs predominantly in Varanus gouldii lizards, principally in the arid interior of Australia. It requires an arthropod intermediate host to complete its life-cycle (Mönnig, 1934, Alicata, 1937).
What is the causative agent of roundworm?
Causative agent: Ascaris lumbricoides hominis]
What is the scientific name of filariasis?
The scientific names of the two species of filarial worms which cause filariasis are W. bancrofti and W. malayi. It causes a slowly developing chronic inflammation of the organs in which they live for many years, usually the lymphatic vessels of the lower limbs.
What is the pathogenesis of lymphatic filariasis?
Lymphatic filariasis is caused by infection with parasites classified as nematodes (roundworms) of the family Filariodidea. There are 3 types of these thread-like filarial worms: Wuchereria bancrofti, which is responsible for 90% of the cases. Brugia malayi, which causes most of the remainder of the cases.
Who filariasis epidemiology?
Lymphatic filariasis affects over 120 million people in 72 countries throughout the tropics and sub-tropics of Asia, Africa, the Western Pacific, and parts of the Caribbean and South America. Whereas the disease was once thought to affect only adults, it now appears that most infections are acquired in childhood.