Lymphatic filariasis, considered globally as a neglected tropical disease (NTD), is a parasitic disease caused by microscopic, thread-like worms. The adult worms only live in the human lymph system. The lymph system maintains the body's fluid balance and fights infections.
What does nocturnal periodicity mean?
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.
What is nocturnal periodicity of microfilariae?
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.
Which one of the following has nocturnal periodicity?
So, the correct option is 'Wuchereria'.
Why Microfilaria is nocturnal in habit?
Microfilaria of Wuchereria bancrofti and Brugia malayi occurring in India displays a nocturnal periodicity, appearing in large numbers at night. This is the biological adaptation to the nocturnal biting habits of the vector mosquitoes. The maximum density in blood is reported between 10 PM and 2 AM.
Which larva of parasite has nocturnal periodicity?
Wuchereria bancrofti, Brugia malayi and B. timori produce microfilariae that usually appear in the blood between 2200 and 0200 hours (nocturnal periodicity).
What is difference between microfilaria and filaria?
Filariae make up a large group of parasitic worms that produce an embryo known as a microfilaria (intermediate stage between egg and larva). These parasites invade the lymphatics, causing lymphedema and elephantiasis. Microfilariae are the smallest forms of filariae.
What is the meaning of diurnal periodicity?
A diurnal cycle (or diel cycle) is any pattern that recurs every 24 hours as a result of one full rotation of the planet Earth around its axis. Earth's rotation causes surface temperature fluctuations throughout the day and night, as well as weather changes throughout the year.
What is meant by diurnal periodicity?
di·ur·nal per·i·o·dic·i·ty. a circadian rhythm with primary expression of the periodicity during daylight hours, as in the release of microfilariae of Loa loa into the peripheral blood during the day, with far fewer released at night; associated with the day-biting habits of the vector, Chrysops species.
What is meant by nocturnal periodicity with reference to the life history of a nematode parasite you have studied?
Solution : The microfilaria larvae of wuchereria Bancroft in man move in the peripheral blood circulation during the night time between 10 pm and 4 am. This tendency is referred to as nocturnal periodicity.
What is periodicity of filarial worms?
The behaviour of microfilariae is adapted to promote transmission by arranging the maximum number of microfilariae in the peripheral blood at times when the arthropod vector is likely to bite. The most sophisticated arrangement to achieve this is by a 24 h rhythm—the classical 'periodicity'.
What is periodicity in parasitology?
The fluctuation in numbers of. microfilariae present in peripheral blood during a 24-hour period is referred to as. periodicity (Fig.
What is the periodicity of Wuchereria bancrofti?
Mathematical analysis, using a simple harmonic-wave model, indicated a periodicity index of 127.6 and that maximum microfilarial densities occurred at 00.51 hours, confirming the nocturnal pattern of microfilaraemia in the study area.
What is nocturnal periodicity of Wuchereria bancrofti?
Typical nocturnal periodicity was observed at a peak time of 0003 hrs with a periodicity index of 136.2.
What is periodicity in filarial worms?
The behaviour of microfilariae is adapted to promote transmission by arranging the maximum number of microfilariae in the peripheral blood at times when the arthropod vector is likely to bite. The most sophisticated arrangement to achieve this is by a 24 h rhythm—the classical 'periodicity'.
What is meant by nocturnal periodicity with reference to the life history of a nematode parasite you have studied?
Solution : The microfilaria larvae of wuchereria Bancroft in man move in the peripheral blood circulation during the night time between 10 pm and 4 am. This tendency is referred to as nocturnal periodicity.
What is periodicity in parasite?
The fluctuation in numbers of. microfilariae present in peripheral blood during a 24-hour period is referred to as. periodicity (Fig.