title: [The 2009 H1N1 flu pandemic in Navarre, Spain].
abstract: BACKGROUND
  To describe flu activity during the 2009-2010 pandemic in Navarre and compare it to previous seasons.
  
  
  METHODS
  An analysis was made of all flu cases reported in primary care and all the virological confirmations made in patients in primary care and in hospitals of Navarre between week 21 of 2009 and week 20 of 2010.
  
  
  RESULTS
  Influenza A (H1N1) Virus 2009 was detected in Navarre between week 23 of 2009 and week 2 of 2010, a period when 39 medically diagnosed cases of flu syndrome per 1,000 inhabitants were registered. The epidemic threshold was surpassed in two periods, with a peak in July and a greater one in November. The greatest incidence was reached in children aged between 5 and 14 years (121 per thousand), followed by the group of under fives. There were 224 hospitalisations (36 per 100,000 inhabitants) with confirmation of Influenza A (H1N1) Virus 2009, 8% of whom required admission to intensive care units and there were four deaths (0.6 per 100,000 inhabitants). The rate of hospitalisation was greater amongst children under five (163 per 100,000 inhabitants), while the probability of referral to intensive care increased with age.
  
  
  CONCLUSIONS
  In spite of not having a specific vaccine available until the season was very well advanced, Influenza A (H1N1)Virus 2009 produced a flu wave with similar levels to those of other seasons and its repercussion in hospitalisations and serious cases was moderate.
authors.affiliation: Instituto de Salud Pública, Pamplona, Spain. jcastilc@navarra.es
authors.forename: Jesús
authors.initials: J
authors.lastname: Castilla
authors.forename: J
authors.initials: J
authors.lastname: Morán
authors.forename: M
authors.initials: M
authors.lastname: Fernández-Alonso
authors.forename: V
authors.initials: V
authors.lastname: Martínez Artola
authors.forename: M J
authors.initials: MJ
authors.lastname: Zamora
authors.forename: A
authors.initials: A
authors.lastname: Mazón
authors.forename: C
authors.initials: C
authors.lastname: Fernández
authors.forename: M
authors.initials: M
authors.lastname: García Cenoz
authors.forename: F
authors.initials: F
authors.lastname: Elía
authors.forename: G
authors.initials: G
authors.lastname: Reina
authors.forename: E
authors.initials: E
authors.lastname: Salcedo
authors.forename: F
authors.initials: F
authors.lastname: Irisarri
authors.forename: A
authors.initials: A
authors.lastname: Barricarte
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D058873:Pandemics; D013030:Spain / Q000453:epidemiology; D055815:Young Adult