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This sensitivity analysis showed that the practical limits of the accuracy of the used screening test jeopardize the estimation of the true herd prevalence within reasonable confidence limits , because the within - herd PTB true prevalence was low . For this reason we augmented the herd specificity for herds with larger adult herd size ( > 5 ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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