Tested Twice (+), Twice (-) on Same Day

After experiencing cold symptoms Elon Musk was tested four times with mixed results:

Something extremely bogus is going on. Was tested for covid four times today. Two tests came back negative, two came back positive. Same machine, same test, same nurse. Rapid antigen test from BD.

– Elon Musk

Nov 12, 2020

https://www.google.com/amp/s/www.theverge.com/platform/amp/2020/11/13/21563590/elon-musk-tests-postive-coronavirus-pcr-antigen?espv=1