At 36 months, IgG Abs were detectable in 74.2% of patients, and NAbs in 83.9% of patients.

Syracuse University

- 56 cases from Beijing hospital of Armed Forces Police, China
- At four months, IgG Abs and NAbs peaked 
- After 16 months, titers gradually declined
- Before two years, IgG Abs and NAbs were detectable in all cases
- After 24 month mark, 11.8% of samples turned to negative 

Two-year cohort study measuring IgG Abs and NAbs levels in SARS-CoV patients

Lin, Q., Zhu, L., Ni, Z., Meng, H., &amp; You, L. (2020). Duration of serum neutralizing antibodies for SARS-CoV-2: Lessons from SARS-CoV infection. Journal of Microbiology, Immunology and Infection. doi:10.1016/j.jmii.2020.03.015
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7141458/ 

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