Volume 27, Number 3—March 2021
Evaluation of National Event-Based Surveillance, Nigeria, 2016–2018
||Communication received or retrieved from EBS system that contains data with potential to meet the WHO definition
for a signal (7)
||Raw signal reviewed by EBS technical staff who considered the signal to represent a potential acute risk to
human health requiring investigation
or verification according to
the WHO definition†
||Group of signals detected by EBS system relating to same disease or syndrome and occurring within ±2 d in the same state
||A signal escalated and recorded by EBS technical staff to a senior surveillance officer for investigation and verification
|Senior surveillance officer
||Nominated member of the surveillance team responsible for investigating and verifying escalated signals
||A signal verified by SSO and surveillance team as an event that has potential
for disease spread
|*Terminology listed in order of appearance during EBS monitoring. EBS, event-based surveillance; SSO, senior surveillance officer; WHO, World Health Organization. †WHO definition states: Data and/or information considered by the Early Warning and Response system as representing a potential acute risk to human health. Signals may consist of reports of cases or deaths (individual or aggregated), potential exposure of human beings to biological, chemical, or radiological and nuclear hazards, or occurrence of natural or man-made disasters (7).|
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