title: [Malaria: under-notification and risk assessment for travelers to the tropics].
abstract: OBJECTIVE
  To define the risk of contracting malaria for travellers to malaria-endemic areas and to calculate the under-notification under the current notification system.
  
  
  METHODS
  Retrospective epidemiological analysis.
  
  
  METHODS
  Agricultural University Wageningen, The Netherlands.
  
  
  METHODS
  Risks of contracting malaria were estimated by calculating the incidence per 100,000 travellers. This incidence was found using an estimated under-notification calculated on the basis of data from the "SIG Zorginformatie' (hospital cases) and the Medical Health Inspectorate (notified cases).
  
  
  RESULTS
  The average under-notification in the Netherlands was at least 59% in the period January 1988 to June 1993 inclusive and increased by 10% each year. Judging by this estimation at least 3170 travellers returned to the Netherlands with malaria in this period. The risk in Africa appeared to be decreasing. In Asia the malaria incidence increased slightly in recent years while no trend was found for America. The imported malaria was mainly caused by Plasmodium falciparum.
  
  
  CONCLUSIONS
  In order to improve the malaria notification system in the Netherlands a notification obligation for all microbiological laboratories should be introduced as almost all malaria is diagnosed there.
authors.affiliation: Erasmus Universiteit, Instituut Maatschappelijke Gezondheidszorg, Rotterdam.
authors.forename: C M
authors.initials: CM
authors.lastname: Reep-van den Bergh
authors.forename: W M
authors.initials: WM
authors.lastname: Docters van Leeuwen
authors.forename: R P
authors.initials: RP
authors.lastname: van Kessel
authors.forename: J L
authors.initials: JL
authors.lastname: Lelijveld
mesh_terms: D018563:Disease Notification; D004812:Epidemiologic Methods; D006801:Humans; D015994:Incidence; D008288:Malaria / Q000453:epidemiology*; D009426:Netherlands / Q000453:epidemiology; D012189:Retrospective Studies; D012306:Risk; D014195:Travel; D014329:Tropical Climate
vernacular_title: Malaria: onderrapportage en risicoschatting voor tropenreizigers.