Astrovirus Infection

Astroviruses are small, nonenveloped, positive-sense, single-stranded RNA viruses that are associated with enteric disease in a wide variety of birds and mammals, including humans.

Using a metagenomic approach, several strains of astrovirus have been identified in lab­oratory mice and wild murids. Further studies with PCR have shown that astrovirus infection is geographically widespread and common among laboratory mice in academic and commercial institutions in the United States and Japan. A wide variety of immunocompetent and immunodeficient strains of mice have been found to be infected. Experimental infection has been shown to be restricted to intestine in immunocompetent mice, but systemic involvement of liver and kidney has been documented in Rag-1 -deficient mice. Infection is con­trolled by both innate and acquired immune responses, and Infection is persistent in immunodeficient mice. Infection is clinically silent, and no lesions, including histopathologic lesions, have been found, regardless of immune status. The significance, if any, of astroviruses in laboratory mice remains unknown.

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