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Larval surveys: For larval surveys, the basic sampling unit is the house or premise, which is systematically searched for water holding containers. Containers are examined for
the presence of mosquito larvae and pupae. Depending on the objective of the survey, the
search may be terminated as soon as Aedes larvae are found, or it may be continued until all
containers have been examined. The collection of specimens for laboratory examination is
necessary to confirm the species. Four indices that are commonly used to monitor Ae aegypti
infection levels are:
i) House index (Hl): percentage of houses infected with larvae and/or pupae
HI = (Number of Houses infected / Number of Houses inspected ) X100
ii) Container Index (Cl): percentage of water holding containers infected with larvae or
pupae.
Cl = (Number of positive containers / Number of containers inspected )X100
iii) Breteau Index (Bl): number of positive containers per 100 houses inspected
Bl: (Number of positive containers / Number of houses inspected) X100
iv) Pupae Index (Pl): number of pupae per 100 houses
Pl =( Number of pupae/ Number of houses inspected) X100
FOR REFFERENCE