Question

This does not accurately describe lymphatic filariasis
A. Intermediate vector is the mollusc
B. Mainly affects the lower limb
C. Chyluria is the most common manifestation
D. Is caused by the parasitic worms Wuchereria bancrofti and Brugia malayi

Answer 1

Hint:
Lymphatic filariasis is a parasitic disease that affects the lymph nodes and lymphatic vessels. This is an extremely rare disease and fewer than 5 thousand cases per year in India are seen. It is a common disease in tropical regions such as Asia, Africa and South America and quite rare in North America.

Complete step by step answer:
Lymphatic filariasis is caused by filarial worms Wuchereria bancrofti and Brugia malayi. They cause a slowly developing chronic inflammation of the organs in which they live for many years. They usually affect the lymphatic vessels of the lower limb. This disease is also called elephantiasis. Chyluria is the most common manifestation and is associated with parasitic infection by Wuchereria bancrofti. It is a rare condition in which the lymphatic fluid leaks into the kidney and turns the urine milky white. This disease results in gross deformities as genital organs are also often affected. Through the bite by the female mosquito vectors, the pathogens are transmitted to a healthy person.
Thus, the correct answer is Intermediate vector is the mollusc.

Option ‘A’ is correct

Note:
When a mosquito bites a person suffering from lymphatic filariasis, the parasitic worms circulating in the blood of the person enter and infect the mosquito and now when this mosquito bites a healthy person, the parasitic worms are transmitted into the blood of the healthy person and thus cause the infection. In most cases, the filariasis is symptomless and long-term damage of the lymph vessels is caused resulting in the swelling of arms, legs and genitalia.