Table 1. Results of HTLV-1 Western Blot Tests and Estimated Number of Human T-Cell Leukemia Virus Type 1 Carrier in Pregnant Women Who Delivered at ≥ 22 Weeks’ Gestation in 2011 and 2013 by Area in Japan.

	2011		2013
	WB positive rate (%)	Estimated HTLV-1 carrier	WB positive rate (%)	Estimated HTLV-1 carrier
Northeast area	0.084	90	0.140	150
Kanto (around Tokyo)	0.062	230	0.067	240
Central area	0.083	120	0.080	110
Kinki (around Osaka)	0.151	240	0.163	270
West central area	0.113	110	0.104	100
Kyushu area (southwest area)	0.596	820	0.663	910
Total	0.154	1,560	0.178	1,780

Values are presented as percentage or number. HTLV-1: human T-cell leukemia virus type 1; WB test: western blot test.