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. 2021 Jun 9;39(30):4034–4038. doi: 10.1016/j.vaccine.2021.06.014

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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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Fig. 3 — Weekly variation of data-driven COVID-19 Twitter topics from December 1, 2020 to February 28, 2021. Significant topics are colored according to their association with each week after Benajamini-Hochberg correction (p < 0.05). Each row represents a topic, each column represents a week, and each cell represents an odds ratio between both.