title: Pandemic 2009 A(H1N1) infection requiring hospitalization of elderly Spanish adults.
abstract: OBJECTIVE
  To describe the clinical presentation and prognosis of elderly adults hospitalized with pandemic 2009 A(H1N1) influenza infection and to compare these data with those of younger patients.
  
  
  METHODS
  Prospective, observational, multicenter study.
  
  
  METHODS
  Thirteen hospitals in Spain.
  
  
  METHODS
  Adults admitted to the hospital with confirmed pandemic 2009 A(H1N1) influenza infection.
  
  
  METHODS
  Demographic, clinical, laboratory, radiological, and outcome variables.
  
  
  RESULTS
  Between June 12 and November 10, 2009, 585 adults with confirmed 2009 A(H1N1) influenza were hospitalized, of whom 50 (8.5%) were aged 65 and older (median age 72, range 65-87). Older adults (≥ 65) were more likely to have associated comorbidities (88.0% vs 51.2%; P < .001), primarily chronic pulmonary diseases (46.0% vs 27.3%; P < .001). Lower respiratory tract symptoms and signs such as dyspnea (60.0% vs 45.6%) and wheezing (46.0% vs 27.8%; P = .007) were also more common in these elderly adults, although pulmonary infiltrates were present in just 14 (28.0%) of the older adults, compared with 221 (41.3%) of the younger adults (P = .06). Multilobar involvement was less frequent in elderly adults with pulmonary infiltrates than younger adults with pulmonary infiltrates (21.4% vs 60.0%; P = .05). Rhinorrhea (4.0% vs 21.9%; P = .003), myalgias (42.0% vs 59.1%; P = .01), and sore throat (14.0% vs 29.2%; P = .02) were more frequent in younger adults. Early antiviral therapy (<48 hours) was similar in the two groups (34.0% vs 37.9%; P = .58). Two older adults (4.0%) died during hospitalization, compared with 11 (2.1%) younger adults (P = .30).
  
  
  CONCLUSIONS
  Elderly adults with 2009 A(H1N1) influenza had fewer viral-like upper respiratory symptoms than did younger adults. Pneumonia was more frequent in younger adults. No significant differences were observed in hospital mortality.
authors.affiliation: Infectious Diseases Unit, Hospital Universitario La Paz--IDIPAZ, Madrid, Spain.
authors.forename: José Ramón
authors.initials: JR
authors.lastname: Paño-Pardo
authors.forename: Diego
authors.initials: D
authors.lastname: Viasus
authors.forename: Jerónimo
authors.initials: J
authors.lastname: Pachón
authors.forename: Antoni
authors.initials: A
authors.lastname: Campins
authors.forename: Francisco
authors.initials: F
authors.lastname: López-Medrano
authors.forename: Aroa
authors.initials: A
authors.lastname: Villoslada
authors.forename: Manuel
authors.initials: M
authors.lastname: Gutiérrez-Cuadra
authors.forename: Tomás
authors.initials: T
authors.lastname: Pumarola
authors.forename: María Dolores
authors.initials: MD
authors.lastname: del Toro
authors.forename: José A
authors.initials: JA
authors.lastname: Oteo
authors.forename: Joaquin
authors.initials: J
authors.lastname: Martínez-Montauti
authors.forename: Juan
authors.initials: J
authors.lastname: Gutiérrez-Aroca
authors.forename: Ferrán
authors.initials: F
authors.lastname: Segura
authors.forename: Jordi
authors.initials: J
authors.lastname: Carratalà
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005500:Follow-Up Studies; D017052:Hospital Mortality / Q000639:trends; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology* / Q000628:therapy; D008297:Male; D058873:Pandemics; D011379:Prognosis; D011446:Prospective Studies; D013030:Spain / Q000453:epidemiology