19th November 2017

Vector Surveillance

Under the WHO, IHR 2005, all International airports and seaports are “kept free from all types of mosquitoes for a distance of 400 meters around the perimeter of ports.” Under IHR, Aedes Aegypti Index: “the ratio expressed as percentage between the number of houses in a limited well defined area on the premises of which actual breeding of Aedes aegypti are found and the total number of houses examined in that area.” This index is kept at zero at all ports

Brief about Aedes Mosquito:

  • Vector: Aedes Aegypti  (Tiger Mosquito)
    • Identification: White stripes on black body
    • Breeds in artificial collection of water i.e. discarded tins, cups, glasses, bottles, tires, fire buckets, flower pots, coconut shells, earthen pots etc (any site where clean water can stagnant for seven days).
    • Life cycle: 7-10 days
  • Ades is Vector for diseases:
    • Yellow fever
    • Dengue hemorrhagic fever
    • Zika

MOSQUITO CONTROL MEASURES:

In line with the policy emphasis has to be laid to reduce the potential mosquito breeding sites at ports/ airports/ Land borders in the first instance which can be obtained by adopting the following principle sequence.

Sequence of Integrated vector control:

  1. Invert/Drain the water wherever possible
  2. Fill what cannot be drained
  3. Timely removal of waste/ garbage (at earliest and must before seven days)
  4. Use of larvicidal chemicals/mineral oil where water can’t be drained off.
  5. Use of larvicidal fish (Gambusia) in big ponds / biolarvicides where it works
  6. Use Anti adult methods (repellants/net/space spray/residual spray)