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The antibody story to #COVID19 is not simple:
1. Some people w/ infection don't develop much IgG (it's about level, not just 0|1)
https://www.scmp.com/news/china/science/article/3078840/coronavirus-low-antibody-levels-raise-questions-about
2. People w/ IgG may still spread (not neutralizing) or get reinfected
3. Duration of Ab/protection is unknown (months/yrs?)
1. Some people w/ infection don't develop much IgG (it's about level, not just 0|1)
https://www.scmp.com/news/china/science/article/3078840/coronavirus-low-antibody-levels-raise-questions-about
2. People w/ IgG may still spread (not neutralizing) or get reinfected
3. Duration of Ab/protection is unknown (months/yrs?)
Some data from the study of 175 patients after #COVID infection to show the variable levels of neutralizing antibody response and influence of age https://www.medrxiv.org/content/10.1101/2020.03.30.20047365v1.full.pdf (preprint)
This report of possible reinfection in 51 S Koreans who had recovered adds to the antibody protection concerns https://fortune.com/2020/04/09/coronavirus-reinfection-fears-grow-cured-patients-test-positive-reactivated-virus/
