Table 1.

Pathological lesions in brain tissue of Rift Valley fever virus (RVFV)-infected Lewis rats.

Day euthanized	# Rats displaying pathology	Description of pathological lesions
1	0/3	None
2	0/3	None
3	0/3	None
4	2/4	Focal mild lymphocytic meningitis
5	1/4	Focal meningeal thickening
6	3/3	Lymphocytic meningitis; vasculitis containing lymphocytes, histiocytes, and neutrophils; focal cortical apoptosis; focal RVFV Ag+ cells in cortex
7	3/3	Lymphocytic meningitis; vasculitis containing lymphocytes, histiocytes, and neutrophils; apoptosis of the subcortical neurons; extensive RVFV Ag+ cells in cortex