- Cohort of 18 patients with known transmission histories from previous 176
- Separate analysis of 18 patients at 6 months, 1, 2, and 3 years to obtain an IgG trend that more accurately represented convalescent SARS patients
- All 18 patients had positive IgG at 6 months and at 1 year 
- 1 patient became IgG negative at 2 years
- Only 55.56% of patients were IgG positive after 3 years 

Syracuse University

- 176 cases from 7 designated SARS hospitals in Shanxi, China
- Day 7 after symptom onset, 11.8% of serum samples were IgG Abs positive
- From days 90-200, 100% of samples were IgG Abs positive
- After 1 year, 93.9% of samples were IgG Abs positive
- After 2 years, 89.6% of samples were IgG Abs positive
- 3 years later, only 50% of convalescent patients had SARS-CoV specific IgG Abs

Three-year study of IgG Abs after SARS-CoV

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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