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Volume 27, Number 3—March 2021
Synopsis

Evaluation of National Event-Based Surveillance, Nigeria, 2016–2018

Kazim BeebeejaunComments to Author , James Elston, Isabel Oliver, Adachioma Ihueze, Chika Ukenedo, Olusola Aruna, Favour Makava, Ejezie Obiefuna, Womi Eteng, Mercy Niyang, Ebere Okereke, Bola Gobir, Elsie Ilori, Olubunmi Ojo, and Chikwe Ihekweazu
Author affiliations: Public Health England, London, UK (K. Beebeejaun, J. Elson, I. Oliver, O. Aruna, E. Okereke); University of Maryland Baltimore, Abuja, Nigeria (A. Ihueze, C. Ukenedo, F. Makava, M. Niyang, B. Gobir); Nigeria Centre for Disease Control, Abuja (E. Obiefuna, W. Eteng, E. Ilori, O. Ojo, C. Ihekweazu)

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Table 1

Definition for terms used in evaluation of national event-based surveillance, Nigeria, 2016–2018*

Term Definition
Raw signal
Communication received or retrieved from EBS system that contains data with potential to meet the WHO definition 
for a signal (7)
Signal
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†
Signal cluster
Group of signals detected by EBS system relating to same disease or syndrome and occurring within ±2 d in the same state
Escalated signal
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
Event
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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Page updated: February 21, 2021
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