Table of Contents
- 1 Why does wuchereria bancrofti microfilaria show nocturnal periodicity?
- 2 Why does Microfilaremia levels are the highest at day time?
- 3 Could you guess the reason for nocturnal periodicity of sheathed microfilaria?
- 4 What is nocturnal periodicity of filarial worm?
- 5 What is periodicity of microfilaria?
- 6 What is the vector of Wuchereria bancrofti?
Why does wuchereria bancrofti microfilaria show nocturnal periodicity?
Microfilariae were found to have great difficulty in passing through the peripheral capillaries. Microfilariae are less active in day blood than in night blood. It is suggested that because of this, they are not able to work their way through the capillaries in the daytime, hence the mechanism of nocturnal periodicity.
Why does Microfilaremia levels are the highest at day time?
During the day-time they accumulate in the small vessels of the lungs, and hence they are few in the peripheral blood; this phase is probably adapted to allow the microfilariae to enjoy favourable physiological conditions in the lungs.
What is nocturnal periodicity with respect to wuchereria Bancrofti?
Wuchereria bancrofti, Brugia malayi and B. timori produce microfilariae that usually appear in the blood between 2200 and 0200 hours (nocturnal periodicity). W. bancrofti found in some Pacific Islands produce microfilariae that appear in the blood in the daytime (diurnal periodicity).
What is nocturnal periodicity?
Nocturnal periodicity is exhibited by microfilarial larva of wuchereria bancrofti. It is a circadian rhythm with the periodicity expressed during night time. It is less active in day blood. It is highly found in the circulation at night. It is found in regions where the vector mosquito is a night-biting species.
Could you guess the reason for nocturnal periodicity of sheathed microfilaria?
It is universally accepted that the periodicity of microfilariae, or the circadian rhythm of microfilariae, is due to the periodic migration of microfilariae between the peripheral blood and the lung capillaries.
What is nocturnal periodicity of filarial worm?
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 causes Wuchereria bancrofti?
Filariasis is an infectious tropical disease caused by any one of several thread-like parasitic round worms. The two species of worms most often associated with this disease are Wuchereria bancrofti and Brugia malayi. The larval form of the parasite transmits the disease to humans by the bite of a mosquito.
Is Wuchereria bancrofti a protozoan?
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….
|An infection in leg by W. bancrofti|
What is periodicity of microfilaria?
The periodicity of microfilariae is a mechanism by which a compromise is arranged between the two requirements of the microfilariae (optimum survival and transmission).
What is the vector of Wuchereria bancrofti?
The microfilariae are moved into a vector i.e., female Culex mosquito. Consequently, female Culex goes about as a vector of Wuchereria bancrofti. Thus, the right answer is option B ‘Culex’.
In which disease blood is collected in night for investigation?
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).
Which parasite shows nocturnal periodicity?