By the end of this Gold Standard lesson, the learner should be able to: - Explain normal state, initial insult, cellular response, organ response, compensation, decompensation, clinical findings, and complications for Airborne vs Droplet vs Contact (Respiratory Focus). - Interpret the transmission route of a suspected pathogen to select airborne, droplet, or contact precautions. - Differentiate N95/negative-pressure room requirements (airborne) from surgical mask within 1 metre (droplet) and gown/glove (contact). - Apply assessment-to-action reasoning to initiate the correct precaution tier at the first suspicion, before laboratory confirmation. - Distinguish the correct PPE doffing sequence and recognise isolation as a public health, not paperwork, decision. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline, likely infection sources, and devices that can fail quietly. When two answers feel partly right, pick the one that reduces imminent harm...