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Papers and Articles |
1 Met Office, FitzRoy Road, Exeter, Devon EX1 3PB
2 Scottish Executive Environment and Rural Affairs Department, Animal Health
Divisional Office, Strathearn House, Broxden Business Park, Lamberkine Drive,
Perth PH1 1RX
3 Department of Population Medicine, Ontario Veterinary College, University of
Guelph, Guelph, Ontario, N1G 2W1, Canada
4 Department for Environment, Food and Rural Affairs, Animal Health Divisional
Office, Hadrian House, Wavell Drive, Carlisle CA1 2TB
5 Department for Environment, Food and Rural Affairs, Animal Health Area Office,
Government Buildings, Kenton Bar, Newcastle Upon Tyne NE20
9TB
The possibility of the airborne spread of foot-and-mouth disease during the 2001 epidemic in the UK has been investigated in three epidemiological case studies. On the basis of evidence from field investigations, and a simple meteorological analysis, it is concluded that the spread of disease was consistent with the airborne transport of virus. The distances ranged from less than 1 km to 16 km; six of the farms were over 6 km from the source and involved the passage of virus over the sea combined with meteorological conditions which strongly favoured airborne disease transmission. The results of detailed atmospheric modelling demonstrated that airborne virus could have challenged livestock on all the farms studied. However, with one exception the 24-hour average daily concentrations of the virus were significantly below the experimentally estimated threshold for infection. A detailed model intercomparison established that, under stable atmospheric conditions, peak concentrations of virus up to two orders of magnitude higher might have been experienced for short periods, owing to fluctuations within the plume of virus, and model limitations. This finding would significantly reduce the apparent discrepancy between the experimentally estimated threshold for infection and the modelling results.
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