title: Evidence of an 'invitation' effect in feeding sylvatic Stegomyia albopicta from Cambodia.
abstract: BACKGROUND
  Orientation of haematophagous insects towards a potential host is largely mediated by kairomones that, in some groups or species may include chemicals produced during feeding by the insects themselves, the so called 'invitation' effect.
  
  
  METHODS
  The 'invitation' effect in blood-feeding diurnally active Stegomyia albopicta was investigated over 33 days in secondary forest in Mondolkiri Province, Cambodia. Two human volunteers sitting inside a shelter collected mosquitoes and noted where and when they landed. A 10% emanator of a synthetic pyrethroid with high vapour action was in use on alternate days.
  
  
  RESULTS
  Overall, 2726 mosquitoes were collected, 1654 of which had the landing site recorded. The heads of the volunteers were the locations with the highest density of landings per surface area whilst the knees and elbows accounted for most of the landings received on the arms and legs. Landings recorded within three minutes of each other on a collector were about 2.5 times more likely to be on the same body part than on a random body part, weighted for landing site preference. This preference did not vary with collector or pyrethroid.
  
  
  CONCLUSIONS
  The 'invitation' effect may be due to a semio-chemical produced early in the feeding process. Incorporation of such a chemical into traps designed to control this important vector of dengue and chikungunya viruses might potentially improve their attractiveness.
authors.affiliation: Vector Group, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, UK. jdcharlwood@gmail.com.
authors.forename: J Derek
authors.initials: JD
authors.lastname: Charlwood
authors.forename: Elsa V E
authors.initials: EV
authors.lastname: Tomás
authors.forename: Louise
authors.initials: L
authors.lastname: Kelly-Hope
authors.forename: Olivier J T
authors.initials: OJ
authors.lastname: Briët
mesh_terms: D000818:Animals; D001733:Bites and Stings; D002160:Cambodia; D009033:Culicidae / Q000502:physiology*; D005247:Feeding Behavior / Q000502:physiology*; D005260:Female; D065928:Forests; D006801:Humans