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Configuration for array testing with a N x M matrix development. Individuals are pooled by row and by column in the first stage of testing. The second stage of the 2-D array testing involves separately retesting specimens not classified as negative in the first stage. These are the samples that lie at intersections of positive rows and columns (in red). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).
