Which Favor the Spread of the Disease Filariasis is seen mainly in developing countries. Lymphatic filariasis is often associated with urbanization, industrialization, illiteracy, poverty and poor sanitation. Migration of people favored the spread of filariasis. The movement of people from one place to another has led to the extension of filariasis into areas where filariasis was not so prevalent. It largely explains the presence of filariasis in the urban areas of Third World countries.
Climate is an important factor in the epidemiology of filariasis. Regions which are damp and moist and have stagnant water all year round afford a good breeding ground for the mosquitoes. It influences the breeding of mosquitoes, their longevity and also determines the development of the parasite in the insect vector.
What is the Incubation Period for Filiariasis? Filariasis has a long incubation period. From the time the parasite gains an entry till the symptoms appear may take as long as eight to 12 months.