How a common pet became a vital tool against the COVID-19 pandemic
In short: While lab rats often dominate scientific research, Syrian hamsters played a critical role in the fight against SARS-CoV-2. These small rodents provided researchers with a biological mirror, allowing scientists to observe how the virus replicates and how treatments might limit lung damage during a global crisis.
In the early stages of the COVID-19 pandemic, researchers needed reliable animal models to understand the progression of SARS-CoV-2. Syrian hamsters, which are commonly kept as pets, emerged as essential subjects because they share key features of the human disease. Studies led by Yoshihiro Kawaoka, published in the Proceedings of the National Academy of Sciences on June 22, 2020, demonstrated that these hamsters are highly effective for evaluating vaccines, drugs, and treatments. This research was conducted through collaborations between institutions in the United States, Japan, and Switzerland. These findings were vital for understanding the virus's impact.
The biological similarities between hamsters and humans allowed scientists to observe specific disease markers. For instance, researchers noted that severe lung damage in hamsters can present as an opaque clouding, a phenomenon similar to the "ground glass" appearance seen in the lungs of human patients. In these models, signs of severe disease typically become apparent within eight days of infection and begin to improve by day ten. CT scans were utilised to monitor these physiological changes. Such imaging provides a clear view of the trachea and bronchi.
Research involving both juvenile hamsters, aged one month, and adults, aged seven to eight months, showed that the virus replicates well in their airways. Scientists used patient samples from the U.S. and Japan to test various doses of the virus. This work helped confirm that prior infection provides protection against reinfection and that treatment with convalescent serum can limit viral replication in the lungs, providing a roadmap for human clinical interventions. The animals exhibited visible symptoms such as lethargy and weight loss during the study. These observations helped validate the model's accuracy.
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Sources
- Summary by Intellect · source: The Hamster That Saved Thousands of COVID Patients
- Also: Hamsters Develop Protective Immunity to COVID-19 and Are Protected by Convalescent Sera
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