Figure 1.

Concentrations of microbial source tracking assay target gene copies per nanogram of DNA extracted. Feces sources analyzed include chicken, cow, dog, duck, goat, and human feces. Target host data points (i.e., chicken and duck data for the avian-specific Avian GFD assay) are represented in red, and the nontarget data points are represented in black. The mean concentration in each source and assay are marked by a cross, with the mean’s 95% confidence interval marked as horizontal lines above and below the mean. Samples where the target was detected but not quantifiable (below 10¹ copies per μL), and where the target was not detected, are marked at detected but not quantifiable (DNQ) and nondetect (ND), respectively.