Funding for this research was provided by:
The Alliance for Health Policy and Systems Research of the World Health Organization (Protocol_DELIR_Immu_SecondWave_Nigeria_V3_5122016)
Received: 7 February 2021
Accepted: 7 February 2021
First Online: 11 August 2021
: Ethical approval for the study was obtained from the Cross River State Health Research Ethics Committee (reference no. CRS/MH/HREC/016/VOL.V/048) and the Ethics Review Committee of the World Health Organization. Written informed consent was obtained from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.