What causes swelling of the lower limbs in patients suffering from filariasis?

Explanation

**Step-by-Step Solution:**

1. **Understanding Filariasis:**
- Filariasis, also known as lymphatic filariasis or elephantiasis, is a disease caused by parasitic worms.

2. **Identifying the Pathogen:**
- The primary pathogen responsible for filariasis is *Wuchereria bancrofti*, a type of filarial worm.

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