Introduction
The World Health Organization declared severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the cause of coronavirus disease 2019 (COVID-19,) a pandemic in March 2020. In Kenya, the first confirmed case was reported in March 2020 [1]; COVID-19 vaccination was initiated in March 2021. By July 2023, 343,898 confirmed cases and 5,689 deaths were recorded since the pandemic start [2], rates that remained low compared with global figures. Kibera informal settlement in Nairobi, one of sub-Saharan Africa’s largest slums, where COVID-19 prevention measures were impossible to implement, reported especially low disease rates. This study evaluated the performance of a rapid test as a potentially useful serosurveillance tool to determine previous SARS-CoV-2 infection in a low resource setting.