The first and original aim of this study was to measure the impact of workplace bullying (WB) seen from the perspective of the witnesses (bystanders) on the work engagement and the burnout of these bystanders. The second aim was to test the mediating roles of affects between WB seen from the perspective of bystanders and two resulting variables, bystanders' work engagement and bystanders' burnout. This study was conducted using self-administered questionnaires with WB bystanders (n = 222) from the Cameroonian health sector. The results indicated that positive and negative affects played mediating roles between WB as seen by witnesses and the two resulting variables, burnout and work engagement. This study offers new avenues for intervention on the issue of WB bystanders. In addition to prevention for victims, witnesses experiencing bullying as bystanders in Cameroon must be supported and accompanied by occupational health services, occupational and psychosocial risk prevention workers, psychologists, as well as human resources.
Keywords: burnout; bystanders; positive and negative affects; psychological health; work engagement; workplace bullying.