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Of these, 52 (9.4 per 10 000) were reactive and 42 mothers (7.6 per 10 000) were confirmed with HTLV-1/2 infection.
HTLV-1/2 geographic distribution was heterogeneous, with a tendency to be higher in the North and North-East parts of Minas Gerais.
This model could be used in other areas with high HTLV-1/2 prevalence rates.
The detection of carrier mothers can enable intervention measures, such as providing infant formula to newborns, to be implemented expeditiously to reduce vertical transmission.
Estimates of HTLV-1 prevalence, therefore, are mainly derived from research data obtained from specific populations, such as blood-donor candidates and pregnant women (1).
HTLV-1 is considered endemic in southeast Japan (where seroprevalence reaches 10%); Caribbean countries (Jamaica and Trinidad and Tobago: up to 6%); Sub-Saharan African countries (Benin, Cameroon, and Guinea Bissau: up to 5%); parts of Iran and Melanesia (less than 5%); and in South American countries (Brazil, Colombia, and Peru: 1%5%) (1, 2).
Research in several countries indicated the following seroprevalence for HTLV-1/2 for every 10 000 pregnant women: 2 in Spain (11), 19 in Argentina (12), 193 in Martinique (13), 170 in Peru (14), 200 in Jamaica (15), 210 in Gabon (16), 250 in Ghana (17), 344 in French Guiana (18), 370 in Zaire (19), and 1 670 in Nigeria (20).
This epidemiologic data demonstrates the heterogeneity seen in the prevalence of HTLV-1/2 across these geographically-dispersed populations.
Its exact prevalence is unknown, as there have been few population-based primary studies.Human T-lymphotropic virus types 1 and 2 (HTLV-1 and HTLV-2) are human retroviruses with tropism for T-lymphocytes.HTLV-1 was described in 1980 as the first human retrovirus, isolated from a patient with cutaneous T-cell lymphoma (1, 2).For reactive samples, the mothers of the newborns had blood drawn to test for these viruses.RESULTS: The study analyzed 55 293 specimens taken from newborns.