Incidence of COVID-19 in patients exposed to chloroquine and hydroxychloroquine : results from a population-based prospective cohort in Catalonia, Spain, 2020
Vivanco-Hidalgo, Rosa Maria (Hospital del Mar (Barcelona, Catalunya))
Molina Romero, Israel (Hospital Universitari Vall d'Hebron)
Martinez, Elisenda (Agència de Qualitat i Avaluació Sanitàries de Catalunya)
Roman-Viñas, Ramón (Agència de Qualitat i Avaluació Sanitàries de Catalunya)
Sánchez Montalvá, Adrián (Hospital Universitari Vall d'Hebron)
Fibla, Joan (Institut de Recerca Biomèdica de Lleida)
Pontes García, Caridad (Universitat Autònoma de Barcelona. Departament de Farmacologia, de Terapèutica i de Toxicologia)
Velasco Muñoz, César (Agència de Qualitat i Avaluació Sanitàries de Catalunya)

Data:	2021
Resum:	Several clinical trials have assessed the protective potential of chloroquine and hydroxychloroquine. Chronic exposure to such drugs might lower the risk of infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) or severe coronavirus disease (COVID-19). To assess COVID-19 incidence and risk of hospitalisation in a cohort of patients chronically taking chloroquine/hydroxychloroquine. We used linked health administration databases to follow a cohort of patients with chronic prescription of hydroxychloroquine/chloroquine and a control cohort matched by age, sex and primary care service area, between 1 January and 30 April 2020. COVID-19 cases were identified using International Classification of Diseases 10 codes. We analysed a cohort of 6,746 patients (80% female) with active prescriptions for hydroxychloroquine/chloroquine, and 13,492 controls. During follow-up, there were 97 (1. 4%) COVID-19 cases in the exposed cohort and 183 (1. 4%) among controls. The incidence rate was very similar between the two groups (12. 05 vs 11. 35 cases/100,000 person-days). The exposed cohort was not at lower risk of infection compared with controls (hazard ratio (HR): 1. 08; 95% confidence interval (CI): 0. 83-1. 44; p = 0. 50). Forty cases (0. 6%) were admitted to hospital in the exposed cohort and 50 (0. 4%) in the control cohort, suggesting a higher hospitalisation rate in the former, though differences were not confirmed after adjustment (HR: 1·46; 95% CI: 0. 91-2. 34; p = 0. 10). Patients chronically exposed to chloroquine/hydroxychloroquine did not differ in risk of COVID-19 nor hospitalisation, compared with controls. As controls were mainly female, findings might not be generalisable to a male population.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	SARS-CoV-2 ; COVID-19 ; Coronavirus ; Chloroquine ; Hydroxychloroquine ; Pre-exposure prophylaxis
Publicat a:	Eurosurveillance, Vol. 26 (march 2021) , ISSN 1560-7917

DOI: 10.2807/1560-7917.ES.2021.26.9.2001202
PMID: 33663646

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