Microfilaria is the term used to refer to the larva of a certain parasitic nematode, i.e., filariae when it is still in an early larval stage. These parasites are released into the bloodstream of the host by the adult parasites. And hence, these embryonic larvae are usually found in the blood of an infected person.
What are the symptoms of filarial worms?
This parasite is found most commonly in Africa. Initially people with Acanthocheilonemiasis may have no symptoms. Symptoms may include itchy skin (pruritis), abdominal pain, chest pain, muscle pain (myalgias), and/or areas of swelling under the skin.
How do I know if I have microfilariae?
The standard method for diagnosing active infection is the identification of microfilariae in a blood smear by microscopic examination. The microfilariae that cause lymphatic filariasis circulate in the blood at night (called nocturnal periodicity).
What drug kills microfilaria?
Diethylcarbamazine (DEC) is the drug of choice in the United States. The drug kills the microfilariae and some of the adult worms. DEC has been used world-wide for more than 50 years.
What causes microfilaria?
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.
Is filariasis same as elephantiasis?
Elephantiasis is also known as lymphatic filariasis. It’s caused by parasitic worms, and can spread from person to person through mosquitoes. Elephantiasis causes swelling of the scrotum, legs, or breasts. Elephantiasis is considered a neglected tropical disease (NTD).
Does microfilaria cause itching?
In the human body, the adult worms produce embryonic larvae (microfilariae) that migrate to the skin, eyes and other organs. The worms can cause severe itching, disfiguring skin conditions, and blindness or impaired vision.
How do you treat microfilaria?
Diethylcarbamazine (DEC) is the drug of choice in the United States. The drug kills the microfilariae and some of the adult worms.
What are the identifying characteristics of microfilariae?
Microfilariae are the diameter of a red blood cell and 250 to 300 μm long. They are enclosed in a characteristic sheath. In addition to B malay i, some other, related Brugia species can infect humans or animals; they resemble B malayi in structure and life cycle, and are not discussed here.
How is microfilaria transmitted?
The infection spreads from person to person by mosquito bites. The adult worm lives in the human lymph vessels, mates, and produces millions of microscopic worms, also known as microfilariae. Microfilariae circulate in the person’s blood and infect the mosquito when it bites a person who is infected.
What is the function of the microfilaria?
The microfilaria (plural microfilariae, sometimes abbreviated mf) is an early stage in the life cycle of certain parasitic nematodes in the family Onchocercidae. 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.
What is microfilaraemia in vertebrates?
In the intermediate host the microfilariae develop into infective larvae that can be transmitted to a new vertebrate host. The presence of microfilariae in the host bloodstream is called “microfilaraemia”.
Are the microfilariae larvae or embryos?
Most recent parasitology textbooks consider the microfilariae to be “pre-larvae or advanced embryos” which will develop into the first stage larvae (L1) in the arthropod vector (p. 364 ). Some consider them to be the first larval stage, such as “microfilariae; i.e. first larva (= L1)” (p. 361 ).
How long do microfilariae take to grow?
Microfilariae grow and develop in the mosquito. When the mosquito bites another person, the larval worms pass from the mosquito into the human skin, and travel to the lymph vessels. They grow into adult worms, a process that takes 6 months or more. An adult worm lives for about 5–7 years.
