Epidemiological Characteristics of Classical Scrapie Outbreaks in UK Sheep Flocks
Author Information
Author(s): K. Marie McIntyre, Simon Gubbins, Wilfred Goldmann, Nora Hunter, Matthew Baylis
Primary Institution: Pirbright Laboratory, Institute for Animal Health
Hypothesis
What are the epidemiological characteristics of sheep flocks naturally infected with classical scrapie?
Conclusion
The study found significant variation in the epidemiological characteristics of scrapie outbreaks among different sheep flocks, influenced by flock-level prion protein genotype profiles.
Supporting Evidence
- The study involved PrP genotype data for nearly 8600 animals and over 400 scrapie cases.
- Most scrapie cases were found in just two PrP genotypes: ARQ/VRQ and VRQ/VRQ.
- The age-at-onset of clinical signs varied significantly among flocks and genotypes.
- Evidence suggested that purchasing infected animals is a key way scrapie is introduced to flocks.
- Seasonality in cases was associated with lambing time in certain flocks.
Takeaway
This study looked at how scrapie affects different sheep flocks and found that the type of sheep and their genetics can change how the disease spreads.
Methodology
The study analyzed PrP genotype data from nearly 8600 animals and over 400 scrapie cases across 30 sheep flocks.
Potential Biases
There may be bias in reporting as farmers might have become more adept at identifying scrapie during outbreaks.
Limitations
The study's design may have truncated outbreak durations as farmers received genotype information, potentially affecting the observed epidemiological characteristics.
Participant Demographics
The study involved 30 sheep flocks across the UK, varying in breed and size.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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