title: Observational Research in Childhood Infectious Diseases (ORChID): a dynamic birth cohort study.
abstract: BACKGROUND
  Even in developed economies infectious diseases remain the most common cause of illness in early childhood. Our current understanding of the epidemiology of these infections is limited by reliance on data from decades ago performed using low-sensitivity laboratory methods, and recent studies reporting severe, hospital-managed disease.
  
  
  METHODS
  The Observational Research in Childhood Infectious Diseases (ORChID) study is an ongoing study enrolling a dynamic birth cohort to document the community-based epidemiology of viral respiratory and gastrointestinal infections in early childhood. Women are recruited antenatally, and their healthy newborn is followed for the first 2 years of life. Parents keep a daily symptom diary for the study child, collect a weekly anterior nose swab and dirty nappy swab and complete a burden diary when a child meets pre-defined illness criteria. Specimens will be tested for a wide range of viruses by real-time PCR assays. Primary analyses involves calculating incidence rates for acute respiratory illness (ARI) and acute gastroenteritis (AGE) for the cohort by age and seasonality. Control material from children when they are without symptoms will allow us to determine what proportion of ARIs and AGE can be attributed to specific pathogens. Secondary analyses will assess the incidence and shedding duration of specific respiratory and gastrointestinal pathogens.
  
  
  BACKGROUND
  This study is approved by The Human Research Ethics Committees of the Children's Health Queensland Hospital and Health Service, the Royal Brisbane and Women's Hospital and The University of Queensland.
  
  
  BACKGROUND
  clinicaltrials.gov NCT01304914.
authors.affiliation: Queensland Paediatric Infectious Diseases Laboratory, Queensland Children's Medical Research Institute, The University of Queensland and the Royal Children's Hospital, Brisbane, Queensland, Australia.
authors.forename: Stephen Bernard
authors.initials: SB
authors.lastname: Lambert
authors.forename: Robert S
authors.initials: RS
authors.lastname: Ware
authors.forename: Anne L
authors.initials: AL
authors.lastname: Cook
authors.forename: Frances A
authors.initials: FA
authors.lastname: Maguire
authors.forename: David M
authors.initials: DM
authors.lastname: Whiley
authors.forename: Seweryn
authors.initials: S
authors.lastname: Bialasiewicz
authors.forename: Ian M
authors.initials: IM
authors.lastname: Mackay
authors.forename: David
authors.initials: D
authors.lastname: Wang
authors.forename: Theo P
authors.initials: TP
authors.lastname: Sloots
authors.forename: Michael D
authors.initials: MD
authors.lastname: Nissen
authors.forename: Keith
authors.initials: K
authors.lastname: Grimwood