A new report from the CDC found that anxiety appears to have caused a series of adverse effects from the Johnson & Johnson vaccine, rather than the shot itself. From April 7 to 9, the CDC received reports of “clusters of anxiety-related events” after patients received the J&J vaccine, including hyperventilation, low blood pressure, headaches, difficulty breathing, lightheadedness, nausea, and fainting, among others, at five mass vaccination sites. At four of those sites, administrators temporarily suspended offering coronavirus vaccines due to the high relative frequency of patients fainting — 8.2 people per 100,000, according to the CDC. For comparison, 0.05 people per 100,000 faint after receiving an influenza vaccine.