Figure 2. Posterior mean probabilities (± 95% credibility intervals) of detecting sporadic (A) or systemic contamination (B) (y-axes) at the site, sample replicate, or PCR replicate level (panels) for each workflow step (x-axes) when contamination is not intentionally introduced but negative samples are processed in isolation (All negative) or in parallel with highly positive samples (Mixed) or six-point standard curve series (Standard curve) (A) and when contamination is intentionally introduced to every sample at either a high or low concentration (B).