Did a Common Childhood Illness Take Down the Neanderthals?
A 21st century nuisance for parents may have proved deadly to early man .
It is one of the great unsolved mysteries of anthropology. What killed off the Neanderthals, and why did Homo sapiens thrive even as Neanderthals withered to extinction ?
Was it some sort of plague specific only to Neanderthals? Was there some sort of cataclysmic event in their homelands of Eurasia that lead to their disappearance?
Neanderthals Visited by Head & Neck Anatomists
A new study from a team of physical anthropologists and head and neck anatomists suggests a less dramatic but equally deadly cause. Published online by the journal, The Anatomical Record , the study, Reconstructing the Neanderthal Eustachian Tube: New Insights on Disease Susceptibility, Fitness Cost, and Extinction suggests that the real culprit in the demise of the Neanderthals was not some exotic pathogen.
A team of physical anthropologists and head and neck anatomists studied Neanderthals to learn more about physical reasons for their extinction. (Oaktree b / Public Domain )
Instead, the authors believe the path to extinction may well have been the most common and innocuous of childhood illnesses -- and the bane of every parent of young children -- chronic ear infections .
Neanderthals Get Their Diagnosis
“It may sound far-fetched, but when we, for the first time, reconstructed the Eustachian tubes of Neanderthals, we discovered that they are remarkably similar to those of human infants,” said co-investigator and Downstate Health Sciences University Associate Professor Samuel Márquez, PhD, “Middle ear infections are nearly ubiquitous among infants because the flat angle of an infant's Eustachian tubes is prone to retain the otitis media bacteria that cause these infections - the same flat angle we found in Neanderthals.”
Chronic otitis media bacterial infections cause damage to the middle ear – as shown. (Welleschik / CC BY-SA 3.0 )
In this age of antibiotics, these infections are easy to treat and relatively benign for human babies. Additionally, around age 5, the Eustachian tubes in human children lengthen and the angle becomes more acute, allowing the ear to drain, all but eliminating these recurring infections beyond early childhood.
The Neanderthal Physical Problem Identified
But unlike modern humans, the structure of the Eustachian tubes in Neanderthals do not change with age - which means these ear infections and their complications, including respiratory infections, hearing loss, pneumonia, and worse, would not only become chronic, but a lifelong threat to overall health and survival.
External and middle ear. Eustachian tube labeled as auditory tube. (Pngbot / Public Domain )
“It's not just the threat of dying of an infection,” said Dr. Márquez. "If you are constantly ill, you would not be as fit and effective in competing with your H. sapien cousins for food and other resources. In a world of survival of the fittest, it is no wonder that modern man, not Neanderthal, prevailed.”
“The strength of the study lies in reconstructing the cartilaginous Eustachian tube ,” said Richard Rosenfeld, MD, MPH, MBA, Distinguished Professor and Chairman of Otolaryngology at SUNY Downstate. “This new and previously unknown understanding of middle ear function in Neanderthals is what allows us to make new inferences regarding the impact on their health and fitness.”
“Here is yet another intriguing twist on the ever-evolving Neanderthal story, this time involving a part of the body that researchers had almost entirely neglected,” said Ian Tattersall, Ph.D., paleoanthropologist and Curator Emeritus of the American Museum of National History. “It adds to our gradually emerging picture of the Neanderthals as very close relatives who nonetheless differed in crucial respects from modern man .”
Top image: This illustration shows the structure of the Eustachian Tube in a Neanderthal male and it's similarity to the human infant. Source: SUNY Downstate Health Sciences University .
The article ‘ Did a Common Childhood Illness Take Down the Neanderthals? ’ was originally published on Science Daily.
Source: SUNY Downstate Health Science University . “ Did a Common Childhood Illness Take Down the Neanderthals? ” Science Daily. Science Daily , 19 September 2019.
Pagano, A., Márquez, S., and Laitman, J. 2019. Reconstructing the Neanderthal Eustachian Tube: New Insights on Disease Susceptibility, Fitness Cost, and Extinction . The Anatomical Record. [Online] Available at: https://anatomypubs.onlinelibrary.wiley.com/doi/abs/10.1002/ar.24248