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Infectious‑disease surveillance has become an exercise in layered intelligence: each test adds a distinct dimension—speed, specificity, breadth—that together enable public health actors to detect, confirm, and monitor pathogens across time and space.
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- The "speed" advantage of rapid tests
Rapid antigen or molecular assays can produce results within minutes. In the field—school screening, point‑of‑care clinics, airport gates—their immediacy turns a potential delay into an actionable moment. A single positive screen triggers isolation protocols before the patient even reaches a laboratory, preventing onward transmission that would otherwise occur while awaiting standard testing.
Because these assays do not require sophisticated instrumentation or extensive training, they are deployable in low‑resource settings where conventional diagnostics are impractical. The trade‑off is usually a lower sensitivity