Eula Biss opens her new book, On Immunity: An Inoculation, with a description of a video her husband recorded the day before she gave birth to their son. In the video, she observes, her face looked free of fear. Twenty-four hours later, after a difficult labor and a blood transfusion, this was no longer true. Suddenly she feared many things: lead paint in the walls, toxic plastics in the crib mattress, carcinogenic minerals in the water. It was 2009, the H1N1 vaccination campaign was soon to launch, and a post-recession wariness tinged the air—“not a good season for trust,”