 In 1948, The American Academy of Pediatrics awarded Andersen the "Borden Bronze Plaque" for her successful research in nutrition, “Determining the effectiveness of different antibiotics in relieving the respiratory-tract infections that were the main cause of death from cystic fibrosis.” By 1958, Anderson was a full-time professor at the Columbia College of Physicians and Surgeons.During this time in her career, Andersen wrote in the "Journal of Chronic Diseases" that her research findings corresponded to cystic fibrosis is a recessively inherited disease that was once thought to be fatal in early infancy, however, now many patients were surviving until early adulthood.Andersen published her final paper in 1959 on the reoccurrence of cystic fibrosis in young adults.