RT Journal Article SR Electronic T1 Understanding the burden of interstitial lung disease post-COVID-19: the UK Interstitial Lung Disease-Long COVID Study (UKILD-Long COVID) JF BMJ Open Respiratory Research JO BMJ Open Resp Res FD British Thoracic Society SP e001049 DO 10.1136/bmjresp-2021-001049 VO 8 IS 1 A1 Jim M Wild A1 Joanna C Porter A1 Philip L Molyneaux A1 Peter M George A1 Iain Stewart A1 Richard James Allen A1 Raminder Aul A1 John Kenneth Baillie A1 Shaney L Barratt A1 Paul Beirne A1 Stephen M Bianchi A1 John F Blaikley A1 Jonathan Brooke A1 Nazia Chaudhuri A1 Guilhem Collier A1 Emma K Denneny A1 Annemarie Docherty A1 Laura Fabbri A1 Michael A Gibbons A1 Fergus V Gleeson A1 Bibek Gooptu A1 Ian P Hall A1 Neil A Hanley A1 Melissa Heightman A1 Toby E Hillman A1 Simon R Johnson A1 Mark G Jones A1 Fasihul Khan A1 Rod Lawson A1 Puja Mehta A1 Jane A Mitchell A1 Manuela Platé A1 Krisnah Poinasamy A1 Jennifer K Quint A1 Pilar Rivera-Ortega A1 Malcolm Semple A1 A John Simpson A1 DJF Smith A1 Mark Spears A1 LIsa G Spencer A1 Stefan C Stanel A1 David R Thickett A1 A A Roger Thompson A1 Simon LF Walsh A1 Nicholas D Weatherley A1 Mark Everard Weeks A1 Dan G Wootton A1 Chris E Brightling A1 Rachel C Chambers A1 Ling-Pei Ho A1 Joseph Jacob A1 Karen Piper Hanley A1 Louise V Wain A1 R Gisli Jenkins YR 2021 UL http://bmjopenrespres.bmj.com/content/8/1/e001049.abstract AB Introduction The COVID-19 pandemic has led to over 100 million cases worldwide. The UK has had over 4 million cases, 400 000 hospital admissions and 100 000 deaths. Many patients with COVID-19 suffer long-term symptoms, predominantly breathlessness and fatigue whether hospitalised or not. Early data suggest potentially severe long-term consequence of COVID-19 is development of long COVID-19-related interstitial lung disease (LC-ILD).Methods and analysis The UK Interstitial Lung Disease Consortium (UKILD) will undertake longitudinal observational studies of patients with suspected ILD following COVID-19. The primary objective is to determine ILD prevalence at 12 months following infection and whether clinically severe infection correlates with severity of ILD. Secondary objectives will determine the clinical, genetic, epigenetic and biochemical factors that determine the trajectory of recovery or progression of ILD. Data will be obtained through linkage to the Post-Hospitalisation COVID platform study and community studies. Additional substudies will conduct deep phenotyping. The Xenon MRI investigation of Alveolar dysfunction Substudy will conduct longitudinal xenon alveolar gas transfer and proton perfusion MRI. The POST COVID-19 interstitial lung DiseasE substudy will conduct clinically indicated bronchoalveolar lavage with matched whole blood sampling. Assessments include exploratory single cell RNA and lung microbiomics analysis, gene expression and epigenetic assessment.Ethics and dissemination All contributing studies have been granted appropriate ethical approvals. Results from this study will be disseminated through peer-reviewed journals.Conclusion This study will ensure the extent and consequences of LC-ILD are established and enable strategies to mitigate progression of LC-ILD.