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. 2021 Feb 25;126(5):535–541.e2. doi: 10.1016/j.anai.2021.02.020

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© 2021 American College of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Differences in symptoms between patients who tested positive and negative for coronavirus disease 2019 stratified by asthma. Symptoms were self-reported by patients at enrollment. Significance was evaluated on the basis of χ² tests. The asterisk indicates P < .05; the double asterisk indicates P < .005; and the triple asterisk indicates P < .0001. SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.