Rat polyomavirus 2 infection: secondary publication

Area of Science:

• Veterinary Virology
• Immunodeficiency Research
• Rodent Pathology

Background:

• Rattus norvegicus polyomavirus 2 (RatPyV2) infection is known to be asymptomatic in immunocompetent rats.
• An outbreak in 2016 highlighted severe clinical manifestations in X-linked severe combined immunodeficiency (XSCID) rats.

Purpose of the Study:

• To comprehensively review the clinical signs, pathological findings, transmission, diagnostic methods, and prevalence of RatPyV2 infection.
• To emphasize the diagnostic importance of salivary gland examination in RatPyV2 infections.

Main Methods:

• Review of existing research and reports on RatPyV2 infection.
• Histopathological examination of infected tissues, focusing on characteristic inclusion bodies and cellular changes.
• Polymerase Chain Reaction (PCR) for viral detection.

Main Results:

• RatPyV2 targets epithelial cells in salivary, Harderian, lacrimal, respiratory, and reproductive organs.
• XSCID rats exhibit respiratory symptoms, emaciation, impaired breeding, and systemic decline.
• Characteristic basophilic nuclear inclusion bodies, hyperplasia, dysplasia, glandular atrophy, fibrosis, and inflammation are observed.
• Parotid salivary glands are highly susceptible, showing severe lesions even in young rats.
• Interstitial pneumonia can occur in severely affected animals.

Conclusions:

• Parotid salivary glands are a primary target for RatPyV2, making them crucial for diagnosis.
• Pathological and PCR examination of salivary glands are essential for accurate RatPyV2 diagnosis in susceptible rat populations.
• Understanding RatPyV2's impact on immunodeficient rats is vital for colony health and research integrity.