title: [Gastroenteritis outbreak in tourists: limitations of information and response].
abstract: BACKGROUND
  We present the results of different studies performed in the investigation of a gastroenteritis outbreak and we describe the difficulties and limitations encountered during its study.
  
  
  METHODS
  Several analytical studies were designed: one cohort study and one case-control study with different samples sizes.
  
  
  RESULTS
  Of the 189 trip participants, 43% answered the questionnaire. Forty-five cases were identified. The factors significantly associated with the disease were: dinner in one of the restaurants of the resort on December 11 in all analytical studies and the excursion to a nearby island in the cohort study.
  
  
  CONCLUSIONS
  The outbreak was confirmed however due to the low response rate and the problems encountered to interview the participants in the trip, it was not possible to identify the route of transmission.
authors.affiliation: Programa de Epidemiología Aplicada de Campo, Centro Nacional de Epidemiología, Instituto de Salud Carlos III, Madrid, España. vhernando@isciii.es
authors.forename: Victoria
authors.initials: V
authors.lastname: Hernando
authors.forename: Dionisio
authors.initials: D
authors.lastname: Herrera
authors.forename: Gloria
authors.initials: G
authors.lastname: Hernández
authors.forename: Carmen
authors.initials: C
authors.lastname: Varela
authors.forename: Salvador
authors.initials: S
authors.lastname: de Mateo
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D015331:Cohort Studies; D016001:Confidence Intervals; D004196:Disease Outbreaks; D005260:Female; D005759:Gastroenteritis / Q000175:diagnosis / Q000453:epidemiology*; D006801:Humans; D007407:Interviews as Topic; D008297:Male; D016017:Odds Ratio; D012306:Risk; D013030:Spain / Q000453:epidemiology; D011795:Surveys and Questionnaires; D013997:Time Factors; D014195:Travel