Count Elon Musk among those who do not trust COVID-19 tests. The billionaire tweeted on Thursday that he is basically stuck at a 50% chance of having Covid after taking four tests.

“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,” Musk tweeted Thursday.

Someone responded to the tweet asking, “Could this be why we’ve been seeing such a major spike?” to which Musk said “If it’s happening to me, it’s happening to others. I’m getting PCR tests from separate labs. Results will take about 24 hours.”

Musk said he does have minor cold-like symptoms, which prompted Dr. Eugene Gu to offer up his own explanation for the conflicting test results, tweeting “It matters what order you received those results. If you had the first two tests come back negative earlier in the day and then the last two tests come back positive later in the day, then it could mean you passed the threshold for detecting the coronavirus as they (not sure what “they” refers to) replicated.” Dr. Gu is the founder and CEO of CoolQuit.com, which helps patients quit smoking but is also now offering at-home COVID testing kits.

In response to questions about his tests and a headline from CleanTechnica that read “Elon Musk Tests Positive for COVID-19,” Musk replied “Technically, I tested positive, then negative twice, then positive again, so ‘Elon Musk Tests Negative for COVID’ is an equally correct title. The rapid antigen test from BD seems to be about as useful as a flipping a coin.”

If Musk needs something to cheer him up today, even though Tesla stock is down 1.93 he’s net worth is still sitting north of $92 billion.

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