Elon Musk on Tuesday revealed that he took multiple COVID-19 vaccines so that he could travel during the period of intense pandemic restrictions and that after taking his third shot, he nearly ended up hospitalized.

Mr. Musk made the remarks in a post on X that was part of a thread he started as a response to a warning by European Union (EU) officials that X has fallen squarely into the bloc's censorship crosshairs for being found to be the top purveyor of so-called misinformation and disinformation.

"Have you heard dis information?" Mr. Musk captioned his original post, in a play on words that accompanied a video compilation of COVID-19 vaccine news headlines that began with bold initial claims early in the pandemic that the vaccines are "100 percent effective" before steadily dropping lower and lower.