title: Prevalence of viral respiratory tract infections in children with asthma.
abstract: BACKGROUND
  Previous studies support a strong association between viral respiratory tract infections and asthma exacerbations. The effect of newly discovered viruses on asthma control is less well defined.
  
  
  OBJECTIVE
  We sought to determine the contribution of respiratory viruses to asthma exacerbations in children with a panel of PCR assays for common and newly discovered respiratory viruses.
  
  
  METHODS
  Respiratory specimens from children aged 2 to 17 years with asthma exacerbations (case patients, n = 65) and with well-controlled asthma (control subjects, n = 77), frequency matched by age and season of enrollment, were tested for rhinoviruses, enteroviruses, respiratory syncytial virus, human metapneumovirus, coronaviruses 229E and OC43, parainfluenza viruses 1 to 3, influenza viruses, adenoviruses, and human bocavirus.
  
  
  RESULTS
  Infection with respiratory viruses was associated with asthma exacerbations (63.1% in case patients vs 23.4% in control subjects; odds ratio, 5.6; 95% CI, 2.7- 11.6). Rhinovirus was by far the most prevalent virus (60% among case patients vs 18.2% among control subjects) and the only virus significantly associated with exacerbations (odds ratio, 6.8; 95% CI, 3.2-14.5). However, in children without clinically manifested viral respiratory tract illness, the prevalence of rhinovirus infection was similar in case patients (29.2%) versus control subjects (23.4%, P > .05). Other viruses detected included human metapneumovirus (4.6% in patients with acute asthma vs 2.6% in control subjects), enteroviruses (4.6% vs 0%), coronavirus 229E (0% vs 1.3%), and respiratory syncytial virus (1.5% vs 0%).
  
  
  CONCLUSIONS
  Symptomatic rhinovirus infections are an important contributor to asthma exacerbations in children.
  
  
  CONCLUSIONS
  These results support the need for therapies effective against rhinovirus as a means to decrease asthma exacerbations.
authors.affiliation: Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.
authors.forename: Nino
authors.initials: N
authors.lastname: Khetsuriani
authors.forename: N Neely
authors.initials: NN
authors.lastname: Kazerouni
authors.forename: Dean D
authors.initials: DD
authors.lastname: Erdman
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Lu
authors.forename: Stephen C
authors.initials: SC
authors.lastname: Redd
authors.forename: Larry J
authors.initials: LJ
authors.lastname: Anderson
authors.forename: W Gerald
authors.initials: WG
authors.lastname: Teague
mesh_terms: D000293:Adolescent; D001249:Asthma / Q000150:complications*; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D003139:Common Cold / Q000453:epidemiology; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D016133:Polymerase Chain Reaction; D015995:Prevalence; D018357:Respiratory Syncytial Virus Infections / Q000453:epidemiology; D012141:Respiratory Tract Infections / Q000453:epidemiology*; D014777:Virus Diseases / Q000453:epidemiology*