The external surfaces of the cerebrum were dusky. The cut sections showed multiple petechial haemorrhages. The cerebellum also showed petechial haemorrhages externally and on multiple cut sections (Figure 2a and 2b). The brain stem and upper spinal chord were grossly normal. Both lungs were heavy (weighing on the right 720 g and left 690 g) and cut sections were congested Figure 1 Thin blood film showing mostly late trophozoites of P. knowlesi in poorly defined erythrocytes (1a) and heavily pigmented monocyte (1b). Note that the blood film was prepared 24 hours post mortem and shows red cell ghosts, particularly among parasite infected red blood cells.