Dr. Anthony Fauci has been the face of America’s Covid response and has been praised and vilified for his expertise. But who are all the other people who have worked behind the scenes at agencies like the National Institute of Allergy and Infectious Diseases and the Centers for Disease Control and Prevention to guide America through the pandemic? This is a question Michael Lewis tackles in his book “The Premonition,” which was published in May 2021. He talks about how getting to know these public health experts gave him a completely different understanding of the country’s public health system — and the systemic challenges institutions like the C.D.C. face when pandemics and other crises strike.

In this conversation, Kara talks to Lewis about “The Premonition,” which he says was a “joyous writing experience.” They discuss the role that social media and the spread of misinformation online has played in hindering effective pandemic responses, as well as some of the characters he came across in his research for the book. He also shares his experience of grief after his daughter Dixie died in a car accident last spring. And he discusses with Kara what he thinks his next book will be about.

You can find transcripts (posted midday) and more information for all episodes at nytimes.com/sway, and you can find Kara on Twitter @karaswisher.