GUIDELINES FOR INTEGRATED VECTOR ... - NVBDCP

NVBDCP, DelhiHI = Number of Houses infectedNumber of Houses inspectedX100ii) Container Index (Cl): percentage of water holding containers infected with larvae orpupae.Cl =Number of positive containersNumber of containers inspected X100iii)Breteau Index (Bl): number of positive containers per 100 houses inspectedBl:Number of positive containersNumber of houses inspectedX100iv)Pupae Index (Pl): number of pupae per 100 housesPl =Number of pupaeNumber of houses inspectedX1002.2 Adult Surveys:i) Landing/biting collection: Landing/biting collection of humans is a sensitive means ofdetecting low level infestations of Ae aegypti, but are very labour intensive. Becauseadult males have low dispersal rates, their presence can be a reliable indicator of clearproximity to hidden larvae habitats. It is usually expressed in terms of landing/bitingcounts per man hour.ii) Resting collection: During periods of inactivity, adult mosquitoes typically rest indoors,especially in bedrooms and mostly in dark places, such as cloth closets and othersheltered sites. Resting collection requires systematic searching of these sites foradult mosquitoes with the aid of flashlight. Following a standard timed collectionroutine in selected rooms of each house, densities are recorded as the number ofadults per house or number of adults per man hour of human efforts.iii) Oviposition traps: Ovitraps are devices used to detect the presence of Ae aegyptiwhere the population density is low and larval surveys are largely unproductive (whenthe Breteau index is less than 5) as well as normal conditions. The ovitrap is used forAe aegypti surveillance in urban areas to evaluate the impact of adulticidal spacespraying on adult female population.3 VECTOR MANAGEMENT3.1 Environmental ManagementThe major environmental management methods used for control of immature stages ofdengue vector are:3