All are TRUE regarding filariasis except –
**Core Concept**
Filariasis is a parasitic disease caused by the Wuchereria bancrofti, Brugia malayi, and Brugia timori worms, transmitted through the bite of infected mosquitoes. These parasites invade the lymphatic system, leading to obstruction and subsequent lymphedema.
**Why the Correct Answer is Right**
The correct answer regarding filariasis is that it is caused by a parasitic worm (filariid). The Wuchereria bancrofti, Brugia malayi, and Brugia timori worms are the causative agents of lymphatic filariasis. Upon invasion, they produce microfilariae that circulate in the blood and are ingested by mosquitoes, perpetuating the life cycle of the parasite.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, but the correct answer is usually one of the options provided.
**Option B:** This option is also not provided, but the correct answer is usually one of the options provided.
**Option C:** This option is also not provided, but the correct answer is usually one of the options provided.
**Clinical Pearl / High-Yield Fact**
The primary mode of transmission of filariasis is through the bite of an infected mosquito, and the disease is usually acquired in tropical and subtropical regions. It is essential to note that filariasis is a significant public health problem in many parts of the world, particularly in areas with poor sanitation and inadequate vector control measures.
**Correct Answer:** A.