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All Studies   Meta Analysis   Recent:  
0 0.5 1 1.5 2+ Hospitalization -46% Improvement Relative Risk Case -8% HCQ for COVID-19  Vivanco-Hidalgo et al.  Prophylaxis Is pre-exposure prophylaxis with HCQ beneficial for COVID-19? Retrospective 20,238 patients in Spain Higher hospitalization with HCQ (not stat. sig., p=0.1) c19hcq.org Vivanco-Hidalgo et al., Eurosurveillance, Mar 2021 Favors HCQ Favors control

Incidence of COVID-19 in patients exposed to chloroquine and hydroxychloroquine: results from a population-based prospective cohort in Catalonia, Spain, 2020

Vivanco-Hidalgo et al., Eurosurveillance, doi:/10.2807/1560-7917.ES.2021.26.9.2001202
Mar 2021  
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Retrospective database analysis of chronic HCQ users and matched control patients, failing to match or adjust for the very different baseline risk for systemic autoimmune disease patients. Other research shows that the risk of COVID-19 for systemic autoimmune disease patients is much higher overall, Ferri et al. show OR 4.42, p<0.001 Ferri. This study is excluded in the after exclusion results of meta analysis: not fully adjusting for the different baseline risk of systemic autoimmune patients.
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risk of hospitalization, 46.0% higher, RR 1.46, p = 0.10, treatment 40 of 6,746 (0.6%), control 50 of 13,492 (0.4%), adjusted per study.
risk of case, 8.0% higher, RR 1.08, p = 0.50, treatment 97 of 6,746 (1.4%), control 183 of 13,492 (1.4%), adjusted per study.
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
Vivanco-Hidalgo et al., 9 Mar 2021, retrospective, Spain, peer-reviewed, 8 authors.
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