A biological sample is a physical specimen such as blood, tissue, saliva, or a slide that can reveal medically relevant information. In security terms, it is not just material for testing: it can also be a carrier of personal data, health data, and evidence about how a diagnosis was made. That makes it sensitive in both clinical and legal contexts.
Why it matters in cyber security is that the sample is usually tied to digital records in laboratory systems, pathology workflows, and case files. Attackers may seek to steal, swap, or tamper with samples, while defenders must preserve labeling, access control, audit logs, and chain of custody. Strong handling procedures help prevent privacy breaches, fraud, and disputed results. Even when the specimen itself is physical, the information it represents needs the same governance as protected digital data.