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The human T-cell leukemia virus types 1 and 2 (HTLV-1 and HTLV-2) were both discovered over three decades ago and infect millions people worldwide. HTLV-1 is associated with the adult T-cell leukemia/lymphoma (ATLL) in about 2% of individuals infected, and another 2 to 3% of individuals develop a neurologic disorder called HTLV-associated myelopathy (HAM). HTLV-2 causes HAM in approximately 1 to 2% of infected individuals, but does not cause ATLL. HTLV-1 and HTLV-2 have served as excellent models for the study of the epidemiology and pathogenesis of virus-associated cancers as well as autoimmune conditions such as multiple sclerosis. Recently, two new members--HTLV-3 and HTLV-4--have been discovered in bushmeat hunters from central Africa, which emphasizes the urgent need for continual surveillance for new human retroviruses and their capacity to cause disease. Important public health issues remain open issues to be addressed in spite of the basic epidemiology of HTLV-1 and HTLV-2 being reasonably well defined. Clinical research is needed in developing potential HTLV-1 and HTLV-2 vaccines, as well as development of treatment options for ATLL and HAM. This 'Recent Advances Issue' contains both reviews and updates on research that encompasses these areas.

HTLV (Viruses)

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The human T-cell leukemia virus types 1 and 2 (HTLV-1 and HTLV-2) were both discovered over three decades ago and infect millions people worldwide. HTLV-1 is associated with the adult T-cell leukemia/lymphoma (ATLL) in about 2% of individuals infected, and another 2 to 3% of individuals develop a neurologic disorder called HTLV-associated myelopathy (HAM). HTLV-2 causes HAM in approximately 1 to 2% of infected individuals, but does not cause ATLL. HTLV-1 and HTLV-2 have served as excellent models for the study of the epidemiology and pathogenesis of virus-associated cancers as well as autoimmune conditions such as multiple sclerosis. Recently, two new members--HTLV-3 and HTLV-4--have been discovered in bushmeat hunters from central Africa, which emphasizes the urgent need for continual surveillance for new human retroviruses and their capacity to cause disease. Important public health issues remain open issues to be addressed in spite of the basic epidemiology of HTLV-1 and HTLV-2 being reasonably well defined. Clinical research is needed in developing potential HTLV-1 and HTLV-2 vaccines, as well as development of treatment options for ATLL and HAM. This 'Recent Advances Issue' contains both reviews and updates on research that encompasses these areas.

HTLV (Viruses)

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This technical report by the World Health Organization (WHO) provides a comprehensive overview of Human T-lymphotropic virus type 1 (HTLV-1). It covers the global and regional epidemiology, transmission modes, diagnostic testing, and health effects associated with HTLV-1 infection. The report discusses the various routes of transmission, such as sexual contact, blood transfusions, and injecting drug use, and emphasizes the importance of screening and prevention strategies. It also addresses the management and treatment of HTLV-1-associated diseases, such as Adult T-cell Leukemia (ATL) and HTLV-1-associated myelopathy (HAM). The document is intended for healthcare professionals, policymakers, and researchers involved in infectious disease control and prevention.

HTLV-I (Virus) --- Epidemiology.

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Human T-cell leukemia viruses 1 and 2 (HTLV-1 and HTLV-2) have similar genomic structure but differ in pathogenicity. HTLV-1 is associated with ATL whereas HTLV-2 has not been linked to lymphoproliferative diseases. A comparative analysis between the two viruses is important to reach a better understanding of the difference in pathogenesis. A key role is attributed to the Tax proteins; Tax-1 function and structure has been thoroughly investigated but less is known about Tax-2. Recent studies on HTLV-1 and HTLV-2 expression strategies highlighted converging patterns as well as peculiar differences in the expression of regulatory proteins that might influence the pathobiology of these viruses. The study of interaction of regulatory proteins with cellular pathways factors has opened new avenues in understanding the mechanisms of gene transcription and deregulation. However, further investigation is needed on the role on innate immunity on HTLV-1 and HTLV-2 pathogenesis. Concerning the mechanisms of infection and related diseases and of their interaction with other co-infecting agents, the comparison between HTLV-1 and HTLV-2 needs further investigation.

Microbiology. --- Proteins --- Co-infection --- Expression --- HTLV-1 --- HTLV-2

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Acquired Immunodeficiency Syndrome. --- HTLV-III. --- Hemophilia.