Publications by authors named "Lewis D Ritchie"

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Investigating the contribution of socio-economic position to ethnic inequalities in severe COVID-19 outcomes: population-based mediation analyses of national linked Scottish data.
Sarah Amele, Eliud Kibuchi, Ronan McCabe, Evangelia Demou, Alastair H Leyland, Lewis D Ritchie

Eur J Public Health· August 2025

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BNT162b2 COVID-19 vaccination uptake, safety, effectiveness, and waning in children and young people aged 5-11 years in Scotland.
Igor Rudan, Steven Kerr, Christopher Sullivan, Karen Jeffrey, Zoe Grange, Lewis D Ritchie

J Glob Health· August 2025

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Risk of winter hospitalisation and death from acute respiratory infections in Scotland: national retrospective cohort study.
Ting Shi, Tristan Millington, Chris Robertson, Karen Jeffrey, Srinivasa Vittal Katikireddi, Lewis Duthie Ritchie

J R Soc Med· July 2024

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Allopurinol and cardiovascular outcomes in patients with ischaemic heart disease: the ALL-HEART RCT and economic evaluation.
Isla S Mackenzie, Christopher J Hawkey, Ian Ford, Nicola Greenlaw, Filippo Pigazzani, Lewis D Ritchie

Health Technol Assess· March 2024

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Caveats in reporting of national vaccine uptake.
Tristan Millington, Kirsty Morrison, Karen Jeffrey, Christopher Sullivan, Amanj Kurdi, Lewis D Ritchie

J Glob Health· February 2024

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Developing the EAVE III platform for future health crises.
Colin R Simpson, Chris Robertson, Jim McMenamin, Lewis D Ritchie, Aziz Sheikh

Lancet Infect Dis· November 2023

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Pregnancy outcomes after SARS-CoV-2 infection in periods dominated by delta and omicron variants in Scotland: a population-based cohort study.
Sarah J Stock, Emily Moore, Clara Calvert, Jade Carruthers, Cheryl Denny, Lewis D Ritchie

Lancet Respir Med· December 2022

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Vaccine effectiveness of two-dose BNT162b2 against symptomatic and severe COVID-19 among adolescents in Brazil and Scotland over time: a test-negative case-control study.
Pilar T V Florentino, Tristan Millington, Thiago Cerqueira-Silva, Chris Robertson, Vinicius de Araújo Oliveira, Lewis D Ritchie

Lancet Infect Dis· November 2022

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Allopurinol versus usual care in UK patients with ischaemic heart disease (ALL-HEART): a multicentre, prospective, randomised, open-label, blinded-endpoint trial.
Isla S Mackenzie, Christopher J Hawkey, Ian Ford, Nicola Greenlaw, Filippo Pigazzani, Lewis D Ritchie

Lancet· October 2022

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A population-based matched cohort study of early pregnancy outcomes following COVID-19 vaccination and SARS-CoV-2 infection.
Clara Calvert, Jade Carruthers, Cheryl Denny, Jack Donaghy, Sam Hillman, Lewis D Ritchie

Nat Commun· October 2022

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Characterising adults in Scotland who are not vaccinated against COVID-19.
Safraj Shahul Hameed, Elliott Hall, Zoe Grange, Christopher Sullivan, Sharon Kennedy, Lewis D Ritchie

Lancet· September 2022

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Second-dose ChAdOx1 and BNT162b2 COVID-19 vaccines and thrombocytopenic, thromboembolic and hemorrhagic events in Scotland.
Colin R Simpson, Steven Kerr, Srinivasa Vittal Katikireddi, Colin McCowan, Lewis D Ritchie

Nat Commun· August 2022

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External validation of the QCovid risk prediction algorithm for risk of COVID-19 hospitalisation and mortality in adults: national validation cohort study in Scotland.
Colin R Simpson, Chris Robertson, Steven Kerr, Ting Shi, Eleftheria Vasileiou, Lewis Duthie Ritchie

Thorax· May 2022

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BNT162b2 and ChAdOx1 nCoV-19 vaccinations, incidence of SARS-CoV-2 infections and COVID-19 hospitalisations in Scotland in the Delta era.
Syed Ahmar Shah, Chris Robertson, Igor Rudan, Josephine Lk Murray, Colin McCowan, Lewis D Ritchie

J Glob Health· April 2022

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Risk of COVID-19 hospital admission among children aged 5-17 years with asthma in Scotland: a national incident cohort study.
Ting Shi, Jiafeng Pan, Srinivasa Vittal Katikireddi, Colin McCowan, Steven Kerr, Lewis Duthie Ritchie

Lancet Respir Med· February 2022

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Association between multimorbidity and mortality in a cohort of patients admitted to hospital with COVID-19 in Scotland.
Utkarsh Agrawal, Amaya Azcoaga-Lorenzo, Adeniyi Francis Fagbamigbe, Eleftheria Vasileiou, Paul Henery, Lewis D Ritchie

J R Soc Med· January 2022

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Two-dose ChAdOx1 nCoV-19 vaccine protection against COVID-19 hospital admissions and deaths over time: a retrospective, population-based cohort study in Scotland and Brazil.
Srinivasa Vittal Katikireddi, Thiago Cerqueira-Silva, Eleftheria Vasileiou, Chris Robertson, Sarah Amele, Lewis D Ritchie

Lancet· January 2022

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Predicted COVID-19 positive cases, hospitalisations, and deaths associated with the Delta variant of concern, June-July, 2021.
Syed Ahmar Shah, Emily Moore, Chris Robertson, Jim McMenamin, Srinivasa Vittal Katikireddi, Lewis D Ritchie

Lancet Digit Health· September 2021

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Cohort Profile: Early Pandemic Evaluation and Enhanced Surveillance of COVID-19 (EAVE II) Database.
Rachel H Mulholland, Eleftheria Vasileiou, Colin R Simpson, Chris Robertson, Lewis D Ritchie

Int J Epidemiol· August 2021

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Temporal trends and forecasting of COVID-19 hospitalisations and deaths in Scotland using a national real-time patient-level data platform: a statistical modelling study.
Colin R Simpson, Chris Robertson, Eleftheria Vasileiou, Emily Moore, Colin McCowan, Lewis D Ritchie

Lancet Digit Health· August 2021

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Vaccine effectiveness of live attenuated and trivalent inactivated influenza vaccination in 2010/11 to 2015/16: the SIVE II record linkage study.
Colin R Simpson, Nazir I Lone, Kim Kavanagh, Tanya Englishby, Chris Robertson, Lewis D Ritchie

Health Technol Assess· December 2020

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Impact of COVID-19 on accident and emergency attendances and emergency and planned hospital admissions in Scotland: an interrupted time-series analysis.
Rachel H Mulholland, Rachael Wood, Helen R Stagg, Colin Fischbacher, Jaime Villacampa, Lewis D Ritchie

J R Soc Med· November 2020

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Seasonal Influenza Vaccine Effectiveness in People With Asthma: A National Test-Negative Design Case-Control Study.
Eleftheria Vasileiou, Aziz Sheikh, Chris C Butler, Chris Robertson, Kimberley Kavanagh, Lewis D Ritchie

Clin Infect Dis· October 2020

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Early Pandemic Evaluation and Enhanced Surveillance of COVID-19 (EAVE II): protocol for an observational study using linked Scottish national data.
Colin R Simpson, Chris Robertson, Eleftheria Vasileiou, Jim McMenamin, Rory Gunson, Lewis D Ritchie

BMJ Open· June 2020

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Evaluating the effectiveness, impact and safety of live attenuated and seasonal inactivated influenza vaccination: protocol for the Seasonal Influenza Vaccination Effectiveness II (SIVE II) study.
Colin R Simpson, Nazir I Lone, Kimberley Kavanagh, Chris Robertson, Jim McMenamin, Lewis D Ritchie

BMJ Open· February 2017

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