(i) Write the scientific names of the two species of filarial worms causing filariasis. (ii) How do they affect the body of infected persons(s)? (iii) How does the disease spread?

Explanation

(i) Filarial worms species.
1. Wuchereria bancrofti,
2. Wucheria Malayai.
(i) They normally affect the lymph vessels of the lower limbs causing them to swell like that of an elephant , hence called elephantiasis.
(iii) The diasease spreads through Female Culex mosquito which is the vector . The pathogens are treansmitted to a healthy person through the bite by the female mosquito vectors.