. Author manuscript; available in PMC: 2015 Jul 27.

Published in final edited form as: J Infect Dis. 2007 Dec 15;196(12):1761–1772. doi: 10.1086/522966

Table 1.

Characteristics of patients with human T lymphotropic virus type 1 (HTLV-1)–associated myelopathy/tropical spastic paraparesis (HAM/TSP) and of healthy HTLV-1 carriers (HCs).

Characteristic	HAM/TSP (n = 20)	HCs (n = 19)
Age, mean ± SD, years	59.1 ± 8.2	48.0 ± 15.2
Sex, no.
Male	10	7
Female	10	12
Serum anti–HTLV-1 antibody titer^a
Mean ± SD	43,300 ± 48,400	1770 ± 2390
Median	16,384	1024
HTLV-1 proviral load in PBMCs^b
Mean ± SD	438 ± 322	245 ± 234
Median	354	151

Anti–HTLV-1 antibodies were titrated by the particle agglutination method.

HTLV-1 Tax copy no./1 × 10⁴ peripheral blood mononuclear cells (PBMCs).