In her beloved novel, Little House on the Prairie, author Laura Ingalls Wilder wrote movingly about how her sister supposedly lost her sight during a bout with scarlet fever. Using evidence from newspaper reports, the author's recollections and school registries, experts at the University of Michigan found that it is likely that scarlet fever was not tyhe cause of Mary Ingalls' blindness.

Published in the journals Pediatrics, University of Michigan researcher Beth A. Tarini MD wrote that modern physicians could not give her a defintive answer, at first, about Mary Ingalls' blindness. Dr. Tarini, who is a physician herself said that the blindness was most probably caused by viral meningoencephalitis.
“Since I was in medical school, I had wondered about whether scarlet fever could cause blindness because I always remembered Mary’s blindness from reading the Little House stories and knew that scarlet fever was once a deadly disease,” says Tarini, an assistant professor of pediatrics in the Child Health Evaluation and Research Unit at the University of Michigan’s C.S. Mott Children’s Hospital. “I would ask other doctors, but no one could give me a definitive answer, so I started researching it.”
Mary Ingalls lost her sight in 1879 at age 14. Dr. Tarini and her co-authors found evidence in Laura Ingalls Wilder’s memoirs and letters that described Mary’s illness as “spinal sickness” with symptoms resembling a stroke. The authors' study quotes a period newspaper report that Mary Ingalls was confined to her bed and “it was feared that hemorrhage of the brain had set in (sic) one side of her face became partially paralyzed.”
“Meningoencephalitis could explain Mary’s symptoms, including the inflammation of the facial nerve that left the side of her face temporarily paralyzed,” Dr. Tarini saids, “and it could also lead to inflammation of the optic nerve that would result in a slow and progressive loss of sight.”
Tarini added that it is no surprise that scarlet fever was labeled the culprit in the series of Ingalls' books. Between 1840 and 1883, scarlet fever was one of the most common infectious causes of death among children in the United States.
“Laura’s memoirs were transformed into the Little House novels. Perhaps to make the story more understandable to children, the editors may have revised her writings to identify scarlet fever as Mary’s illness because it was so familiar to people and so many knew how frightening a scarlet fever diagnosis was,” added Sarah S. Allexan, a medical student at the University of Colorado and lead author of the study. 
Scarlet fever case fatality rates fell dramatically in the early 20th century, for as yet undetermined reasons, well before antibiotic treatment.
But even now, a scarlet fever diagnosis can strike fear into the heart of parents Dr. Tarini sees in her pediatric practice. “Familiar literary references like these are powerful – especially when there is some historical truth to them.” Dr. Tarini said. “This research reminds us that our patients may harbor misconceptions about a diagnosis and that we, as physicians, need to be aware of the power of the words we use – because in the end, illness is seen through the eyes of the patient.”



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Spero News editor Martin Barillas is a former US diplomat, who also worked as a democracy advocate and election observer in Latin America. His first novel 'Shaken Earth', is available at Amazon.

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