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. 1995 Nov;33(11):2999–3003. doi: 10.1128/jcm.33.11.2999-3003.1995

Geographical clustering of human T-cell lymphotropic virus type 1 infection in Honduras.

I L de Rivera 1, L Amador 1, S Mourra 1, Z Li 1, S Rasheed 1
PMCID: PMC228622  PMID: 8576361

Abstract

Geographical clustering of human T-cell lymphotropic virus type 1 (HTLV-1) infection has been identified in the nonmestizo communities in several cities along the Atlantic coast of Honduras. Of the 2,651 serum samples tested, 122 samples were repeatedly reactive for HTLV-1 antibodies in two different enzyme immunoassays and 3 were indeterminate. These sera did not react in the HTLV-2-specific antibody tests. The presence of HTLV-1 antibodies was confirmed by HTLV-1 immunoblots or Western blots (immunoblots), and the infection was verified by the detection of HTLV-1-specific genetic sequences in the cellular DNA by PCR. Genomic DNA from the peripheral blood mononuclear cells was first tested with generic primers and probes that identified both HTLV-1 and HTLV-2. Next, all DNA samples that showed HTLV reactivity were tested by PCR with specific primers and probes that distinguished HTLV-1 sequences from those of HTLV-2. Our results indicate that only HTLV-1 infection was present in the blood of both mestizo and nonmestizo residents of 15 cities in the Republic of Honduras. The overall prevalence of HTLV-1 infection in the nonmestizo population was 8.1% (95% confidence limit, 6.6 to 9.7%). The mestizo population residing in the same geographical vicinities showed a HTLV-1 antibodies in 0.5% of serum samples tested (95% confidence limit, 0.6 to 1.7%), indicating a significantly greater prevalence of HTLV-1 infection in the nonmestizo population than in the mestizo ethnic groups living in Honduras (P = 0.0001). Since no HTLV-2 antibody reactivity or HTLV-2-specific genetic sequences were detected by PCR with different primers and probes, it was concluded that HTLV-2 infection was not present in the Honduran population groups we tested. Our study also suggested an endemic nature for this virus because there was no difference in the prevalence rate of HTLV-1 antibodies in the nonmestizo community living in the coastal towns of Honduras between 1989 and 1993. This is the first report of HTLV-1 cluster identification in Honduras, Central America.

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Selected References

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