The following points highlight the three major disorders caused due to filarial disease. The disorders are: 1. Elephantiasis 2. Hydrocele 3. Chyluria. Disorder # 1. Elephantiasis: The condition is due to hyperplasia of skin and connective tissue, specially involving scrotum, legs and arms. Elephantiasis is the result in many cases of filariasis where in profuse development of skin occurs on [...]
In the life history of mosquito there are four stages namely—egg, larva, pupa and imago or adult. (a) Egg: After sexual union the female mosquito lays about 200-400 fertilised eggs in shallow stagnant water. The eggs of Anopheles and Aedes float separately in the water, but the eggs of Culex remain together and float as a single unit. The individual [...]
The below mentioned article provides notes on tsetse flies as vectors. Tsetse flies are of paramount importance in Africa because of their role as vectors of trypano some infections of man and domestic animals, which have had a profound effect on the economy and development of that continent (Fig. 15.17). The tsetse flies are elongated dark brown or yellowish-brown flies. [...]