<p>We collated anonymized data from the national EVD line list, contacts database and transmission chain database to obtain data on key variables. An EVD-confirmed case had a positive RT-PCR laboratory result for the Ebola virus. We calculated odds ratios for confirmed cases having been listed as a contact before their illness by residence (urban/rural, classified at sub-county level), age group, gender and period (pre-lockdown vs lockdown). We used a logistic regression model to adjust for the potential confounders. We used the Mann-U Whitney test to compare time from onset of symptoms to isolation and confirmation among cases who were previously listed and those who were not. We assessed the effect of being previously listed as a contact on number of people infected and health facilities per case using a Poisson regression model.</p>