As Dr. Anthony Fauci prepares to step down as director of the National Institute of Allergy and Infectious Diseases at the end of the year, the leading immunologist faced derision on social media over the weekend from tech billionaire and Twitter CEO Elon Musk.

"My pronouns are Prosecute/Fauci," Musk tweeted on Sunday. The jibe, shared largely without context, drew support from prominent conservatives such as right-wing Rep. Marjorie Taylor Greene — whose account was reinstated with Musk's decision to end the platform's COVID-19 misinformation policy last month, and who has been criticized in the past for her own comments mocking the use of gender pronouns — as well as backlash.

While Musk's tweet acquired roughly half a million likes in its first few hours online, health experts like Peter Hotez, a vaccine scientist and virology professor, defended Fauci's work at the forefront of U.S. pandemic mitigation efforts and urged Musk to remove the post.

"For the record: Dr. Fauci has done nothing wrong, except serve our nation. In the meantime, Mr. Musk should know that 200,000 Americans needlessly lost their lives from Covid due to this kind of antiscience rhetoric and disinformation. Elon, I'm asking you to take down this Tweet," Hotez wrote. Musk has not responded publicly.