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. 2021 Aug 8;1(3):100035. doi: 10.1016/j.jcvp.2021.100035

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© 2021 The Author(s)

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 2 — Neutralizing activity (expressed as total mean cycle threshold values in supernatants of viral neutralization tests) of nonconvalescent sera from O-group and A- group donors. The non-significant difference in neutralizing activity was seen between the 2 ABO blood groups.