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Vet J. 2010 Jan;183(1):46-53. doi: 10.1016/j.tvjl.2008.08.023. Epub 2008 Oct 17.

Early events in the pathogenesis of foot-and-mouth disease in cattle after controlled aerosol exposure.

Author information

1
Plum Island Animal Disease Center, Foot-and-Mouth Disease Unit PIADC, ARS, USDA, P.O. Box 848, Greenport, NY 11944, USA.
2
Plum Island Animal Disease Center, Foot-and-Mouth Disease Unit PIADC, ARS, USDA, P.O. Box 848, Greenport, NY 11944, USA. Electronic address: luis.rodriguez@ars.usda.gov.

Abstract

The goal of this study was to identify the primary sites of replication of foot-and-mouth disease virus (FMDV) in cattle subsequent to aerogenous inoculation. A novel aerosol inoculation method was developed to simulate natural, airborne transmission and thereby allow the identification of early replication sites. Virus distribution after aerosol inoculation was compared at 24h post inoculation with simple nasal instillation. Aerosol inoculation of FMDV consistently resulted in virus detection by real-time reverse transcriptase-polymerase chain reaction and viral isolation in the soft palate, pharynx, and lungs. Viral antigen was also detected in each of these tissues by immunohistochemistry. Aerosol exposure resulted in typical clinical signs of FMD when animals were kept alive long enough to develop disease. This aerosol infection method is highly reproducible regarding inoculum dose and volume, and allowed the detailed study of early events in FMDV-infected cattle. Extensive postmortem sampling and trimodal virus detection system allows a more precise determination of FMDV localization than previously reported.

PMID:
18930417
DOI:
10.1016/j.tvjl.2008.08.023
[Indexed for MEDLINE]

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