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Correspondence response
Response to: ‘Are patients with systemic lupus erythematosus at increased risk for COVID-19?’ by Favalli et al
  1. Alexis Mathian,
  2. Zahir Amoura
  1. Sorbonne Université, Assistance Publique–Hôpitaux de Paris, Groupement Hospitalier Pitié–Salpêtrière, French National Referral Center for Systemic Lupus Erythematosus, Antiphospholipid Antibody Syndrome and Other Autoimmune Disorders, Service de Médecine Interne 2, Institut E3M, Inserm UMRS, Centre d’Immunologie et des Maladies Infectieuses (CIMI-Paris), Paris, France
  1. Correspondence to Dr Alexis Mathian, Internal Medicine, University Hospital Pitié Salpêtrière, Paris 75651, France; alexis.mathian{at}psl.aphp.fr

https://doi.org/10.1136/annrheumdis-2020-217859

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    We thank Favalli et al for their interest in our study reporting the course of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) disease 2019 (COVID-19) in a case series of 17 patients with systemic lupus erythematosus (SLE) under long-term treatment with hydroxychloroquine (HCQ).1 2 As mentioned in our study, we did not aim at reporting the incidence rate and the severity of COVID-19 in SLE, because our cohort most likely over-represents the most symptomatic and severe cases, as a result of a bias in the selection procedure of the patients used by the physicians.

    Favalli et al, by studying the nasopharyngeal carriage of SARS-CoV-2, confirm the low prevalence of COVID-19 in their cohort …

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