It's far from comforting to hear that, according to a new study, the new H7N9 strain of bird flu has been passed from person to person for the first time. The finding has sparked some scary headlines. "First study of human transmission of new bird flu raises worries," Reuters reports. "Chinese bird flu may be spreading between people," adds the Guardian. But before you buy surgical masks in bulk and retreat to your sanitized basement evacuation shelter, consider that the authors of the scientific study, published this week in the British Medical Journal, went out of their way to point out that the finding is not cause for too much alarm . . . yet.