The anti-vaxxer movement sweeping across the US and Europe prompted Biss, a non-fiction writer, to investigate the benefits of vaccination.
Zuckerberg wrote that public-health workers recommended "On Immunity" to him, given all the science in favor of vaccinations. As vaccines lead to individuals contracting fewer infectious diseases, herd immunity kicks in and communities as a whole enjoy greater health.
"This book explores the reasons why some people question vaccines, and then logically explains why the doubts are unfounded and vaccines are in fact effective and safe," he wrote.