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Journal of Virology, August 2002, p. 7587-7594, Vol. 76, No. 15
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.15.7587-7594.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Shedding and Intracage Transmission of Sin Nombre Hantavirus in the Deer Mouse (Peromyscus maniculatus) Model

Jason Botten,1,2 Katy Mirowsky,1,2 Chunyan Ye,1,2 Keith Gottlieb,1,2 Melissa Saavedra,1,2 Liana Ponce,1,2 and Brian Hjelle1,2,3,4*

Infectious Diseases and Inflammation Program and,1 Departments of Pathology,,2 Biology, and,3 Molecular Genetics and Microbiology, University of New Mexico, Albuquerque, New Mexico 871314

Received 19 February 2002/ Accepted 8 May 2002

The mechanism(s) by which Sin Nombre (SN) hantavirus is maintained in deer mouse populations is unclear. Field studies indicate that transmission occurs primarily if not exclusively via a horizontal mechanism. Using an experimental deer mouse infection model in an outdoor laboratory, we tested whether infected rodents shed SN virus in urine, feces, and saliva, whether infected mice transmit infection to naïve cage mates, and whether infected dams are able to vertically transmit virus or antibody to offspring. Using pooled samples of urine, feces, and saliva collected from mice infected 8 to 120 days postinoculation (p.i.), we found that a subset of saliva samples, collected between 15 and 90 days p.i., contained viral RNA. Parallel studies conducted on wild-caught, naturally infected deer mice showed a similar pattern of intermittent positivity, also only in saliva samples. Attempts to isolate virus through inoculation of cells or naïve deer mice with the secreta or excreta of infected mice were uniformly negative. Of 54 attempts to transmit infection by cohousing infected deer mice with seronegative cage mates, we observed only a single case of transmission, which occurred between 29 and 42 days p.i. Dams passively transferred antibodies to neonatal pups via milk, and those antibodies persisted for at least 2 months after weaning, but none transmitted infection to their pups. Compared to other hantavirus models, SN virus is shed less efficiently and transmits inefficiently among cage mates. Transmission of SN virus among reservoir rodents may require factors that are not required for other hantaviruses.

* Corresponding author. Mailing address: Department of Pathology, University of New Mexico School of Medicine, Albuquerque, NM 87131. Phone: (505) 272-0624. Fax: (505) 272-9912. E-mail: bhjelle{at}salud.unm.edu.

Journal of Virology, August 2002, p. 7587-7594, Vol. 76, No. 15
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.15.7587-7594.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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