NEW: NYC Health Dept has sent alert to all medical providers advising *not* to use anti-body tests to diagnose prior covid infection nor to assess immunity.
— Mark D. Levine (@MarkLevineNYC) April 23, 2020
This is due to high rate of false negatives/positives and uncertainty about how immunity works.
Dose of reality folks. pic.twitter.com/ZEHsbt3aNe