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A 1 to 1000 SARS-CoV-2 reinfection proportion in members of a large healthcare provider in Israel: a preliminary report

Perez, G.; Banon, T.; Gazit, S.; Ben Moshe, S.; Wortsman, J.; Grupel, D.; Peretz, A.; Ben Tov, A.; Chodick, G.; Mizrahi- Reuveni, M.; Patalon, T.

2021-03-08 infectious diseases
10.1101/2021.03.06.21253051 medRxiv
Show abstract

With more than 100 million confirmed COVID-19 cases as of March 2021, reinfection is still considered to be rare. In light of increasing reports of reinfected COVID-19 patients, the need to better understand the real risk for reinfection is critical, with potential effects on public health policies aimed at containing the spread of SARS-CoV-2. In this descriptive preliminary report, we conducted a large-scale assessment on the country level of the possible occurrence of COVID-19 reinfection within the members of a large healthcare provider in Israel. Out of 149,735 individuals with a documented positive PCR test between March 2020 and January 2021, 154 had two positive PCR tests at least 100 days apart, reflecting a reinfection proportion of 1 per 1000. Given our strict inclusion criteria, we believe these numbers represent true reinfection incidence in MHS and should be clinically regarded as such.

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