Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

One Possible Reinfection with SARS-CoV-2 Validated by 205-days Interval of Re-detection in Sapporo City, Japan

Version 1 : Received: 15 April 2021 / Approved: 16 April 2021 / Online: 16 April 2021 (11:09:45 CEST)

How to cite: Asakura, T.; Tamakoshi, A. One Possible Reinfection with SARS-CoV-2 Validated by 205-days Interval of Re-detection in Sapporo City, Japan. Preprints 2021, 2021040439 (doi: 10.20944/preprints202104.0439.v1). Asakura, T.; Tamakoshi, A. One Possible Reinfection with SARS-CoV-2 Validated by 205-days Interval of Re-detection in Sapporo City, Japan. Preprints 2021, 2021040439 (doi: 10.20944/preprints202104.0439.v1).

Abstract

Since SARS-CoV-2 has spread all over the world, one of the key questions is how long immunity works for protecting hosts from infection. However, it was difficult to distinguish reinfection from re-detected positive cases caused by other reasons. We confirmed 23 re-detected positive cases in Sapporo City in 2020, and among them, the case with 205-days interval from initial onset to the second confirmation date was found. We calculated the probability of observing more than one case with over d-days interval of re-detection, pobs, to find out whether the case with 205-days interval had the similar epidemiological characteristic with others or not. We found that 5th percentile and its 95% confidence interval of pobs was 118 (45, 216) for Sapporo City data and 92 (86, 98) for KCDC data. This result indirectly suggested the case with 205-days interval was reinfection.

Keywords

SARS-CoV-2; COVID-19; reinfection; re-detected positive; Japan

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