SARS-CoV-2 antibody-positivity protects against reinfection for at least seven months with 95% efficacy.

There was also no evidence that antibody-positive persons experienced any waning of protective immunity over time, as the incidence rate of reinfection versus month of follow-up did not show an increasing trend over seven months following the first antibody-positive test ( Fig. 4 ).

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There was evidence for a decreasing trend in the incidence rate of reinfection with each additional month of follow-up (Mantel-Haenszel trend analysis p-value: <0.001). 3.4.

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