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Am J Vet Res. 1989 Feb;50(2):205-6.

Prevalence estimation from pooled samples.

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  • 1National Animal Disease Center, USDA, Agricultural Research Service, Ames, IA 50010.


Under certain conditions, prevalence can be estimated by testing samples from individual members or by pooling samples from members into a group and by testing the sample from the group as a single unit. Pooled tests are more accurate than individual tests when P is less than 10%. Optimal group size is 1.6/P. Efficiency decreases slowly with suboptimal size and rapidly with overly large size.

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