title: [Study of the Sociodemographic Factors and Risky Behaviours Associated with the Acquisition of Sexual Transmitted Infections by Foreign Exchange Students in Portugal].
abstract: BACKGROUND
  Sexual transmitted infections are a main cause of morbidity, being a public health problem due to its reproductive complications, mostly observed in teenagers and young adults. The purpose of this study was to evaluate sociodemographic factors and risky behaviours associated with sexual transmitted infections acquisition and to assess personal awareness of risky behaviour and the knowledge about Chlamydia trachomatis infection between foreign exchange students in Portugal.
  
  
  METHODS
  The main instrument for data collection was a questionnaire, applied to foreign students in university exchange in Portugal, during the years 2012/2013, 2013/2014 e 2014/2015 Results: Three hundred and thirty eight (338) questionnaires were evaluated, being 58.3% female students, aged between 17 and 30 years old. Mean age for the beginning of the sexual activity was 17.5 years old and the mean number of lifetime sexual partners was 6.9. Concerning the answers given: 11.8% mentioned a sexual relationship with the same gender, 9.5% mentioned that they have never done oral sex and 29% assumed they had practiced anal sex; 82.1% mentioned alcohol/drugs consumption; 21% did not know that Sexual transmitted infections can be transmitted through oral sex and 42.3% did not recognize Chlamydia trachomatis as an Sexual transmitted infections agent.
  
  
  CONCLUSIONS
  Although sexual transmitted infections can affect individuals of all ages, races and sexual orientation, various demographic, social and behavioral factors have revealed influence in their prevalence rates.
  
  
  CONCLUSIONS
  Despite knowing about sexual transmitted infections, these students maintain sexual risky behaviours, mainly early age for starting sexual activity, multiple sexual partners and the absence of protection during sexual activities.
authors.affiliation: Unidade de Microbiologia Médica. Instituto de Higiene e Medicina Tropical. Universidade NOVA de Lisboa.
authors.forename: Andreia
authors.initials: A
authors.lastname: Gravata
authors.affiliation: Unidade de Microbiologia Médica. Instituto de Higiene e Medicina Tropical. Universidade NOVA de Lisboa. Portugal.
authors.forename: Rita
authors.initials: R
authors.lastname: Castro
authors.affiliation: Unidade de Microbiologia Médica. Instituto de Higiene e Medicina Tropical. Universidade NOVA de Lisboa. Portugal.
authors.forename: João
authors.initials: J
authors.lastname: Borges-Costa
mesh_terms: D000293:Adolescent; D000328:Adult; D002690:Chlamydia Infections; D002692:Chlamydia trachomatis; D054242:Emigrants and Immigrants; D005260:Female; D007722:Health Knowledge, Attitudes, Practice / Q000208:ethnology*; D006801:Humans; D007393:International Educational Exchange; D008297:Male; D011174:Portugal; D012307:Risk Factors; D012309:Risk-Taking; D057566:Self Report; D012749:Sexually Transmitted Diseases / Q000453:epidemiology*; D012959:Socioeconomic Factors; D055815:Young Adult