A team led by Ma and Kim unveiled the dilution‑and‑delay (DnD) susceptibility assay in Nature Communications, a high‑resolution, high‑throughput method that uncovers cryptic antibiotic resistances missed by standard tests. The DnD approach refines temporal and concentration parameters to reveal delayed resistance phenotypes and low‑frequency resistant subpopulations, enabling more accurate susceptibility profiling. Authors argue the assay can inform treatment choices, antibiotic stewardship and drug‑development screening workflows.