Received: 9 September 2020
Accepted: 19 January 2021
First Online: 4 February 2021
Ethics approval and consent to participate
: Ethical committee clearance was provided by the London School of Hygiene and Tropical Medicine Research Ethics Committee and the National Health Research Ethics Committee of Nigeria to undertake this study which uses retrospective routine data collected as part of LF surveillance in Nigeria. The Nigeria Centre for Disease Control collects data in line with the Disease Surveillance and Notification system using the Integrated Disease Surveillance and Response Strategy in Nigeria. Nigeria Centre for Disease Control shared the data with the first author of the manuscript from Public Health England in accordance with a data sharing agreement.
: Not applicable.
: The authors declare that they have no competing interests. The UK Public Health Rapid Support Team is funded by the United Kingdom Department of Health and Social Care. The views expressed in this publication are those of the authors and not necessarily those of the National Health System, the National Institute for Health Research, or the Department of Health and Social Care.