This is a hope provided by a new method of immunotherapy. This method has not only revived an old treatment method in a new way but has also opened a new door of relief for millions of people.Glenys Scadding still vividly remembers the first patient of her sublingual immunotherapy (treatment involving placing medicine under the tongue) 40 years ago. That patient was so debilitated by seasonal allergies, known as hay fever, that they could not walk to their local train station near their home without gasping for breath or sneezing.Scadding's treatment involved administering drops of medicine under the tongue to...