Nature Immunology, Published online: 24 August 2021; doi:10.1038/s41590-021-00998-y

One year into the COVID-19 pandemic, governments and health agencies are hyperfocused on mitigation efforts such as masking and physical distancing, as well as vaccine logistics—as they should be. But they continue to ignore, much to everyone’s peril, a parallel, ever-worsening public health crisis: the damage done by the spread of medical mis- and disinformation online.