Table 1. Distribution of study participants ^*.

Categories of participants	Detailed characteristics of informants
EVD survivors and EVD-affected people	- Survivors who donated CP - Survivors who did not donate CP - CP recipients who recovered - Relatives from survivors and deceased CP recipients - Members from the Survivors Association in Conakry - Focal points and peer educators working on the trial
Local staff	- Guinean NBTC trial staff (doctors, nurses, lab technicians) - Guinean MSF staff (medical staff, health promotion and psychosocial workers, laboratory technicians, WatSan and outreach teams) - Research assistants on the project - Field coordinator - Principal Investigators
Expatriate staff	- ITM (the trial coordinator, medical workers, lab experts, trial monitor) - EFS (transfusion specialists)

* This distribution is more complex in reality as people could belong to several categories, e.g. being a survivor, member of the Survivors Association, a CP donor and local MSF staff