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Updated: Jun 19, 2026

A Laboratory Method to Measure Contagious Yawning in Rats
Published on: June 14, 2019
1Laboratories of the Rockefeller Institute for Medical Research, New York.
Rabbits experimentally infected with yaws and syphilis spirochetes developed testicular lesions and positive complement fixation reactions. This model allows for further study of cultivation, immunity, and treatment for these diseases.
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