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Alex J Walker

Angkor Hospital for Children ·
Area of research
Infectious Diseases · Oncology
Research interest
Research interests include COVID-19 Clinical Research Studies, COVID-19 and healthcare impacts, Venous Thromboembolism Diagnosis and Management, and SARS-CoV-2 and COVID-19 Research.
h-index
47
citations
17,704
works
309
NIH funding
primary concept
Medicine
email

Recent publications

Long-term kidney outcomes after COVID-19: a matched cohort study using the OpenSAFELY platform
The Lancet Regional Health - Europe 2025cited by 2position: middledoi
Impact of long COVID on health-related quality-of-life: an OpenSAFELY population cohort study using patient-reported outcome measures (OpenPROMPT)
The Lancet Regional Health - Europe 2024cited by 94position: middledoi
Impact of vaccination on the association of COVID-19 with cardiovascular diseases: An OpenSAFELY cohort study
Nature Communications 2024cited by 37position: middledoi
Incidence of diabetes after SARS-CoV-2 infection in England and the implications of COVID-19 vaccination: a retrospective cohort study of 16 million people
The Lancet Diabetes & Endocrinology 2024cited by 21position: middledoi
Effectiveness of mRNA COVID-19 Vaccines as First Booster Doses in England: An Observational Study in OpenSAFELY-TPP
Epidemiology 2024cited by 7position: middledoi
Impact of COVID-19 on recorded blood pressure screening and hypertension management in England: an analysis of monthly changes in the quality and outcomes framework indicators in OpenSAFELY
Open Heart 2024cited by 5position: middledoi
OpenSAFELY: The impact of COVID‐19 on azathioprine, leflunomide and methotrexate monitoring, and factors associated with change in monitoring rate
British Journal of Clinical Pharmacology 2024cited by 2position: middledoi
Changes in COVID-19-related mortality across key demographic and clinical subgroups in England from 2020 to 2022: a retrospective cohort study using the OpenSAFELY platform
The Lancet Public Health 2023cited by 97position: lastdoi
Comparative effectiveness of BNT162b2 versus mRNA-1273 covid-19 vaccine boosting in England: matched cohort study in OpenSAFELY-TPP
BMJ 2023cited by 41position: middledoi
Trends, variation, and clinical characteristics of recipients of antiviral drugs and neutralising monoclonal antibodies for covid-19 in community settings: retrospective, descriptive cohort study of 23.4 million people in OpenSAFELY
BMJ Medicine 2023cited by 37position: middledoi
Healthcare use attributable to COVID-19: a propensity-matched national electronic health records cohort study of 249,390 people in Wales, UK
BMC Medicine 2023cited by 35position: middledoi
Challenges in Estimating the Effectiveness of COVID-19 Vaccination Using Observational Data
Annals of Internal Medicine 2023cited by 31position: middledoi
Factors associated with COVID-19 vaccine uptake in people with kidney disease: an OpenSAFELY cohort study
BMJ Open 2023cited by 8position: middledoi
Ethnic differences in the indirect effects of the COVID-19 pandemic on clinical monitoring and hospitalisations for non-COVID conditions in England: a population-based, observational cohort study using the OpenSAFELY platform
EClinicalMedicine 2023cited by 6position: middledoi
Impact of COVID-19 on mental illness in vaccinated and unvaccinated people: a population-based cohort study in OpenSAFELY
medRxiv 2023cited by 0position: middledoi
Additional file 5 of Healthcare use attributable to COVID-19: a propensity-matched national electronic health records cohort study of 249,390 people in Wales, UK
Open MIND 2023cited by 0position: middledoi
Long COVID burden and risk factors in 10 UK longitudinal studies and electronic health records
Nature Communications 2022cited by 558position: middledoi
OpenSAFELY: Representativeness of electronic health record platform OpenSAFELY-TPP data compared to the population of England
Wellcome Open Research 2022cited by 114position: lastdoi
Risk of severe COVID-19 outcomes associated with immune-mediated inflammatory diseases and immune-modifying therapies: a nationwide cohort study in the OpenSAFELY platform
The Lancet Rheumatology 2022cited by 108position: middledoi
Comparative effectiveness of sotrovimab and molnupiravir for prevention of severe covid-19 outcomes in patients in the community: observational cohort study with the OpenSAFELY platform
BMJ 2022cited by 95position: middledoi
Impact of first UK COVID-19 lockdown on hospital admissions: Interrupted time series study of 32 million people
EClinicalMedicine 2022cited by 80position: middledoi
Mortality among Care Home Residents in England during the first and second waves of the COVID-19 pandemic: an observational study of 4.3 million adults over the age of 65
The Lancet Regional Health - Europe 2022cited by 77position: middledoi
Overall and cause-specific hospitalisation and death after COVID-19 hospitalisation in England: A cohort study using linked primary care, secondary care, and death registration data in the OpenSAFELY platform
PLoS Medicine 2022cited by 66position: middledoi
Waning effectiveness of BNT162b2 and ChAdOx1 covid-19 vaccines over six months since second dose: OpenSAFELY cohort study using linked electronic health records
BMJ 2022cited by 62position: middledoi
Safety of COVID-19 vaccination and acute neurological events: A self-controlled case series in England using the OpenSAFELY platform
Vaccine 2022cited by 30position: middledoi
Rates of serious clinical outcomes in survivors of hospitalisation with COVID-19 in England: a descriptive cohort study within the OpenSAFELY platform
Wellcome Open Research 2022cited by 22position: middledoi
Comparative effectiveness of ChAdOx1 versus BNT162b2 covid-19 vaccines in health and social care workers in England: cohort study using OpenSAFELY
BMJ 2022cited by 22position: middledoi
Potentially inappropriate prescribing of DOACs to people with mechanical heart valves: A federated analysis of 57.9 million patients' primary care records in situ using OpenSAFELY
Thrombosis Research 2022cited by 12position: middledoi
Studying the Long-term Impact of COVID-19 in Kids (SLICK). Healthcare use and costs in children and young people following community-acquired SARS-CoV-2 infection: protocol for an observational study using linked primary and secondary routinely collected healthcare data from England, Scotland and Wales
BMJ Open 2022cited by 1position: middledoi
Health care use attributable to COVID-19: A propensity matched national electronic health records cohort study of 249,390 people in Wales, UK.
Research Square 2022cited by 0position: middledoi

Grants

No grants ingested yet.

Frequent collaborators

Ben Goldacre · Angkor Hospital for Children11 papers (2019–2024)Helen J Curtis · Angkor Hospital for Children9 papers (2020–2024)Seb Bacon · Science Oxford9 papers (2020–2024)Brian MacKenna · Science Oxford8 papers (2020–2024)William Hulme · Angkor Hospital for Children7 papers (2020–2024)Amir Mehrkar · University of Oxford7 papers (2020–2024)Sinéad Brophy · Swansea University6 papers (2021–2023)Srinivasa Vittal Katikireddi · MRC/CSO Social and Public Health Sciences Unit6 papers (2021–2023)Venexia Walker · University of Bristol5 papers (2022–2024)Elizabeth Williamson · University of London5 papers (2020–2024)Mike Seaborne · Swansea University4 papers (2022–2023)David Evans · United States Census Bureau4 papers (2020–2023)Anna Schultze · Brigham and Women's Hospital4 papers (2020–2023)Jonathan Kennedy · Roswell Park Comprehensive Cancer Center4 papers (2021–2023)Laurie A. Tomlinson · Science Oxford4 papers (2021–2023)Chris Bates · Texas Public Policy Foundation4 papers (2020–2024)John Parry · London School of Hygiene & Tropical Medicine4 papers (2020–2024)Frank Hester · King's College Hospital4 papers (2020–2024)Jonathan Cockburn · WPP (United Kingdom)4 papers (2020–2024)Simon Davy · London School of Hygiene & Tropical Medicine4 papers (2021–2023)