Table 1.

Concentration of Viral Antigen⁺ Cells in Tissues from Cats Acutely Infected with FIV

Tissue	FIV+ cells/×20 field*	FIV+ cells/g tissue
Brain	0	0
Thymus	15.3	1,278,713
Lymph node	18.5	1,700,175
Liver	0.6	9,930
Spleen	8.0	483,472
Intestine†	12.1	899,320
Kidney	0	0
Bone marrow	14.3	1,155,421

*Mean for all FIV⁺ cats; non-cell-associated virus excluded; ×20 objective field = 0.13 mm².

^†Mucosa and submucosa only; all FIV⁺ cells were morphologically consistent with leukocytes.