Researchers Ma and Kim published a dilution‑and‑delay (DnD) susceptibility assay that detects hidden and heterogeneous antibiotic resistance at high resolution and throughput. The method reveals resistances traditional assays miss and can be scaled for large panels and drug libraries. The technique could change clinical microbiology by improving detection of heteroresistance, guiding antibiotic stewardship, and informing drug development. Adoption will depend on clinical validation, integration with laboratory workflows, and regulatory acceptance for diagnostic use.