Every raw EWARN alert or informal rumor passes four time-bound checkpoints: immediate logbook registration at T+0h, district rapid-response line-listing by T+6h, initial verification feedback under IHR Article 10 within 24 hours, and formal Annex 2 scoring by T+48h.
Operational reference: IHR (2005) Article 10 Verification Rules and CDC Global Health IHR Core Capacities.
Four-Stage Signal Verification Stepper
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STEP 01 · T+0 HOURS (SIGNAL CAPTURE)
Log Signal Source, Timestamp, and Administrative Code
Assign a unique logbook identifier immediately upon receipt from a sentinel clinic, community volunteer, port-of-entry officer, or open-source media scan. Record raw case counts without overwriting prior tallies.
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STEP 02 · T+6 HOURS (FIELD LINE-LIST & SPECIMEN DISPATCH)
Apply Case Definition and Rule Out Duplicate Reporting
Deploy the district rapid response team to interview clinicians, construct a standardized line-list (age, sex, onset date, travel history), and dispatch cold-chain specimens with manifest tracking.
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STEP 03 · ≤24 HOURS (ARTICLE 10 VERIFICATION RESPONSE)
Confirm Signal Validity or Dismiss False Rumor
When WHO requests verification of an informal signal under IHR Article 10, the National IHR Focal Point must acknowledge and provide initial available public health information within 24 hours.
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STEP 04 · ≤48 HOURS (ANNEX 2 ASSESSMENT & ARTICLE 6)
Run Annex 2 Gate and Mobilize PHEOC
Complete the four-criterion Annex 2 evaluation within 48 hours. If Box A applies or ≥2 criteria are met, transmit formal notification to WHO within 24 hours; if inconclusive (1 criterion), initiate Article 8 consultation.
Verification Escalation Matrix
| IHR (2005) Article | Operational Obligation | Statutory Window | Responsible Authority | Verification Status |
|---|---|---|---|---|
| Article 5 | Core surveillance and response capacity maintenance at local, intermediate, and national tiers | Continuous (5-year capacity baseline) | Ministry of Health / National Surveillance Unit | BASELINE |
| Article 6 (Assess) | Apply Annex 2 decision instrument to all unusual or severe public health events | Within 48 hours of detection | National IHR Focal Point (NFP) | 48H GATE |
| Article 6 (Notify) | Notify WHO by most efficient communications means following affirmative Annex 2 assessment | Within 24 hours of assessment | National IHR Focal Point (NFP) | 24H MANDATORY |
| Article 7 | Information-sharing during unexpected or unusual events regardless of origin or source | Immediate upon evidence emergence | State Party NFP | CONTINUOUS |
| Article 8 | Confidential technical consultation with WHO when Annex 2 threshold is inconclusive (1 criterion met) | Concurrent with 48h assessment | National IHR Focal Point (NFP) | CONSULTATIVE |
| Article 10 | Verify non-State / informal epidemic intelligence signals upon WHO request | Initial response within 24 hours | National IHR Focal Point (NFP) | 24H VERIFY |
Verification Funnel Diagram
Historical Archive Anchor: /ewarn Verification Logbook
Legacy pointers targeting /ewarn signal triage resolve directly to this verification stepper, preserving historical context on EWARN field reporting workflows.