Prevalence of Aedes aegypti and Aedes albopictus-Vectors of Dengue Haemorrhagic Fever in North, North-East and Central India.
AbstractThe Aedes aegypti mosquito vector was found to be prevalent in the western, northern, Indo- Gangetic and eastern plains, Assam valley and the coastal areas of Orissa state in India. The species was non-existent in the Himalayan region. In north-central highlands, the species showed low-to-moderate prevalence, while in south-central highlands, the mountainous areas were largely free but high populations of the vector were encountered in the valleys. Similarly, the eastern plateau, including the eastern ghats were comparatively free of the vector except large towns in the Mahanadi basin. The Satpura ranges of north Deccan were also found to be free of Ae. aegypti. The elevation, type of relief, terrain, density of population, water storage practices in droughtprone regions and high rainfall leading to formation of secondary foci had direct relationship with the prevalence of the species. Altitudes above 1000 metres were found to be unfavourable for the species. Being hygroscopic, the species depicted a phenomenon of ‘annual pulsation’. It tends to move to ‘mother foci’ in the central parts of cities which are humid during the dry season and spreads out during the wet season. Aedes albopictus was encountered in the peripheral areas of towns where it replaced the Ae. aegypti populations. However, in the eastern plateau, the species penetrated upto the central parts, probably due to lack of intra-species competition from aegypti which is very scanty in the region. The information proved to be of immense value in delimiting areas which were prone to DF/DHF epidemics. The internal dynamics provided useful information for developing control strategies.
Kalra, NL, Kaul, SM & Rastogi, RM. (1997). Prevalence of Aedes aegypti and Aedes albopictus-Vectors of Dengue Haemorrhagic Fever in North, North-East and Central India.. WHO Regional Office for South-East Asia. https://iris.who.int/handle/10665/148533