Evaluating the impact of transmission mode, calibration level and farmer compliance in simulation models of paratuberculosis in dairy herds.

6 represents natural fluctuations in prevalence, where herds with low prevalence will have an increasing trend, and herds with high prevalence will have a decreasing trend.

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Data We also wanted to evaluate whether PTB generally showed a trend toward moderate or high within-herd prevalence in dairy herds.

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Of the herds that had an R-squared value above 0.5, seven had a positive slope and 35 had a negative slope, indicating that most herds demonstrating a clear trend have decreasing prevalence.

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Of these, 76% (220) had a negative slope and 24% (69) had a positive slope, meaning that most herds showed a negative trend in the estimated true within-herd prevalence over time.

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