Table 1.

Prevalence rates of HTLV-1/2 infection in population groups of the Amazon region of Brazil

Location	Group	Sample size	Prevalence rate HTLV (%)	HTLV-1 (n)	HTLV-2 (n)	HTLV (n)a	Reference (#)
Rondonia	Blood donors	–	0.3a	–	–	–	[100]
Acre	Blood donors	11,121	0.09	9	3	–	[99]
	Blood donors	–	0.5a	–	–	5	[100]
	Blood donors	219	0.46	1	0	–	[101]
	Cruzeiro do Sul	136	0.73	1	0	–	[111]
Amazonas	Blood donors	1200	0.08	1	–	–	[98]
	Blood donors	–	0.53a	–	–	–	[100]
	Blood donors	6865	0.14	–	–	–	[112]
	Pregnant women	674	0	–	–	–	[105]
	Skin diseases	1091	0	–	–	–	[112]
	Blood donors	87,402	0.03	16	5	3	[113]
Amapa	Blood donors	–	0.71a	–	–	–	[100]
	Afrodescendants	186	0	–	–	–	[114]
	HIV-1	52	0	–	–	–	[118]
	HIV-1	140	0	–	–	–	[114]
	Lacen	30	16,6	5	–	–	[114]
Maranhao	Blood donors	–	0.1a	–	–	–	[100]
	Pregnant women	2044	0.34	4	3	–	[104]
	Pregnant women	324	0.7	5			[115]
	Blood donors	365,564	0.15a	–	–	72a	[102]
Para	Indians	137	31.4a	43	–	–	[84]
	Indians	209	10.5	22	–	–	[85]
	Blood donors	–	0.9a	–	–	–	[100]
	Indians	314	7.6	1	18	5	[63]
	Indians	1324	0–40	5	104	–	[6]
	Indians	177	5.1	–	9	–	[51]
	Indians	263	0.29	–	77	–	[56]
	Pregnant women	13,382	0.3	39	1	–	[103]
	Pregnant women	324	0.61	2	0	–	[106]
	Tucurui	657	4.7a	–	–	–	[116]
	Belem	1059	2	15	5	–	[117]
	HIV-1	149	8.0	4	7	1	[50]
	HIV-1	117	5.1	2	4	–	[118]
	Japaneses	44	0	–	–	–	[85]
	Japanese	168	1.78	3	–	–	[88]
	Afrodescendants (Marajo Island)	259	1.5	3	1	–	[87]
	Marajo Island	1899	0.10	2	–	–	[94]
	Drug users	826	5.32	25	19	–	[55]

^aTested only by enzyme immune assay (ELISA)