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We thank Favalli et al for their comment on our letter1 regarding the effect of antimalarials for the prevention of coronavirus disease 2019 (COVID-19).2 The authors provide updated information on a cohort of 914 patients with rheumatic and musculoskeletal diseases (RMDs), 112 of whom were treated with hydroxychloroquine (HCQ). The prevalence of confirmed or suspected COVID-19 cases was similar in both groups, and a patient with systemic sclerosis-associated lung disease treated with HCQ had a fatal outcome. Notably, 87% of patients reported rigorous compliance with contagion prevention measures.
These data are in accordance with accumulating evidence published over the last 2 months, indicating the occurrence of mild and severe cases of infection by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in patients with RMDs treated with antimalarials (table 1).1–16 Out of 869 reported patients with RMDs with confirmed COVID-19, 190 (22%) were taking long-term antimalarials prior to the infection.1–16 Of those, 99 out of 181 (55%) with available data developed …
Footnotes
Handling editor Josef S Smolen
Twitter @romaovc
Contributors VCR, ARC-M, JEF: study conception and design, data acquisition, data analysis, manuscript preparation and critical revision. All authors approved the final version of the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, conduct, reporting or dissemination plans of this research.
Provenance and peer review Commissioned; internally peer reviewed.