The California program that identifies and treats cases of dangerous infant botulism also comforts families by sending silly cards on their babies' first birthdays. Staff at the state's Infant Botulism Treatment and Prevention Program decorate and mail roughly 200 cards a year to celebrate the recovery of children affected by the rare condition. In recent months, that has included dozens of U.S. babies affected by a botulism outbreak tied to contaminated ByHeart infant formula. Federal health officials continue to investigate the source of the outbreak that sickened more than 50 infants.