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. 2020 Dec 9;9(2):693–701. doi: 10.1016/j.jaip.2020.11.054

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© 2020 American Academy of Allergy, Asthma & Immunology.

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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World map of asthma comorbidity rates in patients with COVID-19. The difference in asthma comorbidity rate is visualized as a colored world map, in which a darkening color represents higher prevalence. The asthma comorbidity rate was calculated as follows: for countries with 2 or more studies reporting the prevalence of asthma in patients with COVID-19, a meta-analysis was performed to estimate the pooled prevalence; for countries with only 1 study on asthma prevalence in patients with COVID-19, asthma prevalence was calculated as (total patients with COVID-19 with asthma)/(total patients with COVID-19).