Scrapie Outbreak Analysis
Author Information
Author(s): K Marie McIntyre, Simon Gubbins, Wilfred Goldmann, Emily Stevenson, Matthew Baylis
Primary Institution: Institute for Animal Health
Hypothesis
Changes in PrP genotypes during a scrapie outbreak will affect the age-at-onset and clinical signs of the disease.
Conclusion
The study found that the age-at-onset and clinical signs of scrapie changed over time, largely driven by the PrP genotypes of the cases.
Supporting Evidence
- The outbreak involved 131 confirmed cases of scrapie in a single flock.
- Most cases were in two genotypes, VRQ/VRQ and VRQ/ARQ.
- The age-at-onset of disease increased as the outbreak progressed.
- Clinical signs changed over the course of the outbreak.
Takeaway
This study looked at a big outbreak of a sheep disease called scrapie and found that the type of genes the sheep have affects when they get sick and how they show signs of being sick.
Methodology
The study analyzed confirmed scrapie cases in a flock over several years, focusing on PrP genotypes and clinical signs.
Potential Biases
Potential reporting bias due to changes in farmer recognition of clinical signs over time.
Limitations
The exact time of initial infection in the flock is unknown, and genotypes were unavailable for 16 cases.
Participant Demographics
The study involved a flock of Welsh Mountain sheep.
Statistical Information
P-Value
<0.001
Confidence Interval
95% CI: 0.90–0.98
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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