A) shows titers of 121 volunteers whose blood was collected approximately 30 days post symptom onset and were recalled for an additional blood draw approximately 82 days post symptom onset. B)-F) shows the same data but stratified by initial/day 30 titer.

University of Michigan - Ann Arbor

Neutralization titers correlated with spike-binding titers (Spearman r=0.87, p<0.0001). 50% of the low titer categories, 90% of the moderate, and 100% of the high had neutralizing activity. After comparing overall titers from the 30-day blood draw to the 82-day blood draw, the authors saw a geometric mean titer (GMT) decrease from 670 to 642. The high titer category experienced a drop in titer while individuals in low and medium category increased. 

SARS-CoV-2 infection induces robust, neutralizing antibody responses that are stable for at least three months: Results

Wajnberg, A., Amanat, F., Firpo, A. et al. 2020. SARS-CoV-2 infection induces robust, neutralizing antibody responses that are stable for at least three months. 
* doi: https://doi.org/10.1101/2020.07.14.20151126

SARS-CoV-2 infection induces robust, neutralizing antibody responses that are stable for at least three months

A) shows a correlation analysis between ELISA titers on the x-axis and neutralization titers in a microneutralization assay on the y-axis. B) shows the proportion of sera that exert any neutralizing activity in each of the ELISA titer categories. 

Figure 2. Neutralizing activity of serum samples in relation to ELISA titers

A) indicates the distribution by positive titers. B) indicates the absolute numbers and percent of individuals with medium or higher titers over time.

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