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We thank Wu et al for their interest in our study reporting on the prevalence of COVID-19 in patients with rheumatic diseases (RMD).1 Wu et al suggest that potential detection bias due to more frequent regular visits to hospitals in patients with RMD may explain the observed greater prevalence of hospital COVID-19 cases in these patients. However, this is highly unlikely since the identification of hospital PCR+ cases was performed in April 2020, still in the peak phase of COVID-19 pandemic in Spain, when the regular scheduled follow-up visits had been cancelled and restricted to urgent medical care. In addition, PCR test shortage resulted in the need to restrict testing to ‘COVID-19-likely’ symptomatic patients at emergency departments, making unlikely preferential testing of RMD or other specific patients. Nevertheless, we cannot exclude other biases such as …
Footnotes
Handling editor Josef S Smolen
Contributors All authors have contributed to writting this letter and have revised the final 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.