Scientists have discovered the first evidence of a respiratory infection in a dinosaur

Hypothetical recovery of life MOR 7029. Note that the lung disease that infects this animal would not be outwardly obvious, but probable external symptoms similar to pneumonia included cough, shortness of breath, nasal discharge, fever, and weight loss, among others. . Author: Woodruff, et al. (2022) and Corbin Rainbolt

The fossils of a young diplodocide – a large herbivorous sauropod with a long neck – may be the first evidence of a dinosaur respiratory infection, according to a study published in Scientific reports. The findings broaden our understanding of the diseases dinosaurs suffer from.

Infected Diplodocus Vertebrae

Abnormal bone growth in MOR 7029. (A) Schematic map of diplodocus neck, with abnormal bone growth marked in red. (B) cervical vertebra MOR 7029 with red frame highlighting abnormal structure; close-up in (C) with an interpretive pattern in (D) (abnormal structure in red). Author: Woodruff, et al.

The specimen, known as MOR 7029, was found in 1990 in southwestern Montana, USA, and dates back to the late[{” attribute=””>Jurassic Period (approximately 150 million years ago). Cary Woodruff and colleagues examined three of the bones from MOR 7029’s neck and identified bony protrusions that had an unusual and irregular shape and texture. These protrusions were located in an area of each bone where they would have been attached to air-filled structures, known as air sacs. These air sacs would have connected to MOR 7029’s lungs and formed part of the dinosaur’s respiratory system. CT imaging of the irregular protrusions revealed that they were made of abnormal bone that most likely formed in response to an infection.

Dinosaur Infection Route

The elaborate and circuitous pulmonary complex of the sauropod, with the hypothetical route of infectious pathway in MOR 7029. Human scale bar is the profile of a man standing 170cm tall. Credit: Woodruff, et al., and Francisco Bruñén Alfaro

Based on the location of the abnormal bony protrusions, the researchers suggest that they formed in response to an infection in MOR 7029’s air sacs, which then spread into its neck bones. The authors speculate that this could have been caused by a fungal infection similar to aspergillosis, a common respiratory illness that affects birds and reptiles and can lead to bone infections. They suggest that if MOR 7029 had been infected with aspergillosis, it may have experienced flu or pneumonia-like symptoms such as weight loss, coughing, fever, and breathing difficulties. As aspergillosis can be fatal in birds if untreated, MOR 7029 could have ultimately died as a result of this infection, they add.

For more on this discovery, see Sauro-Throat! First Evidence Discovered Indicating Respiratory Infection in a Dinosaur.

Reference: “The first occurrence of an avian-style respiratory infection in a non-avian dinosaur” by D. Cary Woodruff, Ewan D. S. Wolff, Mathew J. Wedel, Sophie Dennison and Lawrence M. Witmer, 10 February 2022, Scientific Reports.
DOI: 10.1038/s41598-022-05761-3 Scientists have discovered the first evidence of a respiratory infection in a dinosaur

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