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. 2021 Jan 5;54(5):830–838. doi: 10.1016/j.jmii.2020.12.009

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© 2021 Taiwan Society of Microbiology. Published by Elsevier Taiwan LLC.

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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Antibody response in 36 patients. Altogether 236 serum samples from immediately after hospitalization were collected from 36 patients (#1 to #36). Thirty six patients were divided into 4 groups. Group A; 4 patients from Diamond Princess cruise ship, Group B; 2 patients from Africa, Group C; 23 Japanese patients who were diagnosed PCR positive at outside laboratories before transferred to our hospital and re-confirmed by our in house PCR assay, Group C’; 7 Japanese patients diagnosed positive at outside laboratory with Ct (threshold cycle values 36 to 41), but could not be re-confirmed by our laboratory after hospitalization, Serial COI (Cut off Index) was shown from day 0 to day 50 in the upper panel and COI from day 0 to day 10 (expanded) in the lower panel. Abbreviation, y/o, years old; M, male; F, female.