USE OF IgG AVIDITY TO INDIRECTLY MONITOR EPIZOOTIC TRANSMISSION OF SIN NOMBRE VIRUS IN DEER MICE (PEROMYSCUS MANICULATUS)

DAVID SAFRONETZ Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada; Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Center for Infectious Diseases and Immunity, Departments of Pathology, Biology, and Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico

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ROBBIN LINDSAY Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada; Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Center for Infectious Diseases and Immunity, Departments of Pathology, Biology, and Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico

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BRIAN HJELLE Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada; Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Center for Infectious Diseases and Immunity, Departments of Pathology, Biology, and Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico

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RAFAEL A. MEDINA Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada; Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Center for Infectious Diseases and Immunity, Departments of Pathology, Biology, and Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico

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KATY MIROWSKY-GARCIA Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada; Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Center for Infectious Diseases and Immunity, Departments of Pathology, Biology, and Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico

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MICHAEL A. DREBOT Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada; Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Manitoba, Canada; Center for Infectious Diseases and Immunity, Departments of Pathology, Biology, and Molecular Genetics and Microbiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico

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An IgG avidity assay was developed to differentiate deer mice that had recently acquired Sin Nombre virus (SNV) from those that were infected in the distant past. Using this procedure, low avidity antibodies were predominantly detected in experimentally infected deer mice (89.5%) within the first 30 days post-inoculation. The assay was then applied to sera from naturally infected deer mice collected during a field investigation associated with a cluster of hantavirus pulmonary syndrome cases. A higher proportion of seropositive mice collected during the outbreak had serum with low avidity antibodies (16.7%) when compared with mice trapped four months later (5.7%). Sin Nombre virus RNA was detectable in blood in a similar fraction of low- (45%) and high- (38.7%) avidity groups. Non-adult mice were more likely to contain low-avidity antibodies (44.4%) than were adults (9.6%). Our results indicate that the IgG avidity assay shows promise as a tool to better characterize epizootic intensity and to identify factors involved in SNV transmission.

Author Notes

Reprint requests: Michael A. Drebot, Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory, Public Health Agency of Canada, 1015 Arlington Street, Winnipeg, Manitoba R3E 3R2, Canada, Telephone: 204-789-6059, Fax: 204-789-2082, E-mail: mike_drebot@phac-aspc.gc.ca.
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