RT @EricTopol@twitter.activitypub.actor
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?)