Probability of infection in a test-negative sample

Design (target) prevalence

Test sensitivity

Test specificity

Sample size

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Use this to calculate the probability that a sample of test-negative animals will include
one or more infected individuals, given that they come from a popuation infected at a given design prevalence and the specified test
sensitivity and specificity. Also calculated is the probability that all animals in the sample will test negatively. Results are calculated for the specified design prevalence
as well as for a range of prevalence values.