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Treviño A, Aguilera A, Rodríguez-Iglesias M, Hernández A, Benito R, Roc L, Ramos JM, Ortiz de Lejarazu R, Rodríguez C, del Romero J, Calderón E, García-Costa J, Poveda E, Requena S, Soriano V, de Mendoza C, on behalf of the Spanish HTLV Netwo. HTLV infection in HCV-antibody positive patients in Spain. AIDS Res Hum Retroviruses 2017; 33:1013-1017. [PMID: 28269998 DOI: 10.1089/aid.2016.0323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Since hepatitis C virus (HCV) and human T-lymphotropic virus (HTLV) share transmission routes, dual infection could be frequent. In Spain, HTLV underdiagnosis is highlighted by the high proportion of patients presenting either with tropical spastic paraparesis (TSP) or adult T-cell leukemia (ATL) at first diagnosis. We examined whether the renewed efforts for expanding HCV testing may provide a sentinel population that might selectively be targeted to unveil asymptomatic HTLV carriers. The presence of anti-HTLV antibodies was examined in 3,838 consecutive individuals with reactive HCV serology attended during the last three years at 13 hospitals distributed across the Spanish geography. Overall 71% were male and the median age was 41-years old. Foreigners represented 9% of the study population. A total of 50 individuals (1.3%) were seroreactive for HTLV, being 30 confirmed as HTLV-2 and two as HTLV-1 (0.12%). The remaining 18 had indeterminate Western blot patterns. Most individuals with HTLV-2 and HTLV indeterminate serology were HIV-positive, former injection drug users and native Spaniards. In contrast, the two HTLV-1 infections were found in men coming from Brazil and the Dominican Republic, respectively. In summary, the overall prevalence of HTLV infection in individuals living in Spain seropositive for HCV is 1.3%, more than 10-fold greater than in general outclinics in Spain. However, immigrants from HTLV-1 endemic regions and former injection drug users with HTLV-2 infection are by far the major contributory groups in HCV patients. Therefore, testing for HTLV in newly diagnosed HCV individuals would not contribute much to improve late HTLV diagnosis in Spain.
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Affiliation(s)
- Ana Treviño
- Internal Medicine Laboratory, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain
| | - Antonio Aguilera
- Microbiology Department, Hospital de Conxo-CHUS, Santiago de Compostela, Spain
| | | | - Araceli Hernández
- Microbiology Department, Hospital Universitario Insular de Gran Canaria, Las Palmas, Spain
| | - Rafael Benito
- Microbiology Department, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
| | - Lourdes Roc
- Microbiology Department, Hospital Miguel Servet, Zaragoza, Spain
| | | | | | | | | | - Enrique Calderón
- Internal Medicine Department, Hospital Virgen del Rocío and CIBERESP, Sevilla, Spain
| | | | - Eva Poveda
- Clinical Virology Unit, INIBIC-Complejo Hospitalario Universitario, A Coruña, Spain
| | - Silvia Requena
- Internal Medicine Laboratory, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain
| | - Vicente Soriano
- Infectious Diseases Unit, La Paz University Hospital and Autonomous University, Madrid, Spain
| | - Carmen de Mendoza
- Internal Medicine Laboratory, Hospital Universitario Puerta de Hierro Majadahonda, Madrid, Spain
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Paiva A, Casseb J. Origin and prevalence of human T-lymphotropic virus type 1 (HTLV-1) and type 2 (HTLV-2) among indigenous populations in the Americas. Rev Inst Med Trop Sao Paulo 2015; 57:1-13. [PMID: 25651320 PMCID: PMC4325517 DOI: 10.1590/s0036-46652015000100001] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 09/02/2014] [Indexed: 01/09/2023] Open
Abstract
Human T-lymphotropic virus type 1 (HTLV-1) is found in indigenous peoples
of the Pacific Islands and the Americas, whereas type 2 (HTLV-2) is widely
distributed among the indigenous peoples of the Americas, where it appears to be more
prevalent than HTLV-1, and in some tribes of Central Africa. HTLV-2 is considered
ancestral in the Americas and is transmitted to the general population and injection
drug users from the indigenous population. In the Americas, HTLV-1 has more than one
origin, being brought by immigrants in the Paleolithic period through the Bering
Strait, through slave trade during the colonial period, and through Japanese
immigration from the early 20th century, whereas HTLV-2 was only brought
by immigrants through the Bering Strait. The endemicity of HTLV-2 among the
indigenous people of Brazil makes the Brazilian Amazon the largest endemic area in
the world for its occurrence. A review of HTLV-1 in all Brazilian tribes supports the
African origin of HTLV-1 in Brazil. The risk of hyperendemicity in these
epidemiologically closed populations and transmission to other populations reinforces
the importance of public health interventions for HTLV control, including the
recognition of the infection among reportable diseases and events.
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Affiliation(s)
- Arthur Paiva
- Universidade Federal de Alagoas, Hospital Universitário, Maceió, Alagoas, Brazil
| | - Jorge Casseb
- Institute of Tropical Medicine of São Paulo, University of São Paulo, São Paulo, SP, Brazil
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Paiva A, Casseb J. Sexual transmission of human T-cell lymphotropic virus type 1. Rev Soc Bras Med Trop 2014; 47:265-74. [PMID: 25075475 DOI: 10.1590/0037-8682-0232-2013] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 02/17/2014] [Indexed: 11/22/2022] Open
Abstract
Human T-cell lymphotropic virus type 1 (HTLV-1) is endemic in many parts of the world and is primarily transmitted through sexual intercourse or from mother to child. Sexual transmission occurs more efficiently from men to women than women to men and might be enhanced by sexually transmitted diseases that cause ulcers and result in mucosal ruptures, such as syphilis, herpes simplex type 2 (HSV-2), and chancroid. Other sexually transmitted diseases might result in the recruitment of inflammatory cells and could increase the risk of HTLV-1 acquisition and transmission. Additionally, factors that are associated with higher transmission risks include the presence of antibodies against the viral oncoprotein Tax (anti-Tax), a higher proviral load in peripheral blood lymphocytes, and increased cervicovaginal or seminal secretions. Seminal fluid has been reported to increase HTLV replication and transmission, whereas male circumcision and neutralizing antibodies might have a protective effect. Recently, free virions were discovered in plasma, which reveals a possible new mode of HTLV replication. It is unclear how this discovery might affect the routes of HTLV transmission, particularly sexual transmission, because HTLV transmission rates are significantly higher from men to women than women to men.
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Affiliation(s)
- Arthur Paiva
- Laboratório de Investigação em Dermatologia e Imunodeficiência, Instituto de Medicina Tropical de São Paulo, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Jorge Casseb
- Laboratório de Investigação em Dermatologia e Imunodeficiência, Instituto de Medicina Tropical de São Paulo, Universidade de São Paulo, São Paulo, SP, Brazil
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Oltra E, García-Escudero M, Mena-Durán AV, Monsalve V, Cerdá-Olmedo G. Lack of evidence for retroviral infections formerly related to chronic fatigue in Spanish fibromyalgia patients. Virol J 2013; 10:332. [PMID: 24216038 PMCID: PMC4226024 DOI: 10.1186/1743-422x-10-332] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 10/17/2013] [Indexed: 01/04/2023] Open
Abstract
Background The etiology of fibromyalgia and chronic fatigue syndrome (FM/CFS) is currently unknown. A recurrent viral infection is an attractive hypothesis repeatedly found in the literature since it would explain the persistent pain and tiredness these patients suffer from. The initial striking link of two distinct orphan retroviruses: the gamma retroviruses murine leukemia virus (MLV)-related virus and the delta retrovirus T-lymphotropic virus type 2 (HTLV-2) to chronic fatigue have not been confirmed to date. Results Genomic DNA (gDNA) from 75 fibromyalgia patients suffering from chronic fatigue and 79 age-matched local healthy controls were screened for the presence of MLV-related and HTLV-2 related proviral sequences. The XMRV env gene was amplified in 20% of samples tested (24% patients/15% healthy controls). Unexpectedly, no PCR amplifications from independent gDNA preparations of the same individuals were obtained. None of the positive samples showed presence of contaminating murine sequences previously reported by other investigators, neither contained additional regions of the virus making us conclude that the initial env amplification came from spurious air-driven amplicon contaminants. No specific HTLV-2 sequences were obtained at any time from any of the 154 quality-controlled gDNA preparations screened. Conclusions Previous associations between MLV-related or HTLV-2 retrovirus infection with chronic fatigue must be discarded. Thus, studies showing positive amplification of HTLV-2 sequences from chronic fatigue participants should be revised for possible undetected technical problems. To avoid false positives of viral infection, not only extreme precautions should be taken when nested-PCR reactions are prepared and exhaustive foreign DNA contamination controls performed, but also consistent amplification of diverse regions of the virus in independent preparations from the same individual must be demanded. The fact that our cohort of patients did not present evidence of any of the two types of retroviral infection formerly associated to chronic fatigue does not rule out the possibility that other viruses are involved in inciting or maintaining fibromyalgia and/or chronic fatigue conditions.
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Affiliation(s)
- Elisa Oltra
- Facultad de Medicina, C/Quevedo, 2, 46001 Valencia, Spain.
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Shirinian M, Kfoury Y, Dassouki Z, El-Hajj H, Bazarbachi A. Tax-1 and Tax-2 similarities and differences: focus on post-translational modifications and NF-κB activation. Front Microbiol 2013; 4:231. [PMID: 23966989 PMCID: PMC3744011 DOI: 10.3389/fmicb.2013.00231] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 07/29/2013] [Indexed: 11/13/2022] Open
Abstract
Although human T cell leukemia virus type 1 and 2 (HTLV-1 and HTLV-2) share similar genetic organization, they have major differences in their pathogenesis and disease manifestation. HTLV-1 is capable of transforming T lymphocytes in infected patients resulting in adult T cell leukemia/lymphoma whereas HTLV-2 is not clearly associated with lymphoproliferative diseases. Numerous studies have provided accumulating evidence on the involvement of the viral transactivators Tax-1 versus Tax-2 in T cell transformation. Tax-1 is a potent transcriptional activator of both viral and cellular genes. Tax-1 post-translational modifications and specifically ubiquitylation and SUMOylation have been implicated in nuclear factor-kappaB (NF-κB) activation and may contribute to its transformation capacity. Although Tax-2 has similar protein structure compared to Tax-1, the two proteins display differences both in their protein–protein interaction and activation of signal transduction pathways. Recent studies on Tax-2 have suggested ubiquitylation and SUMOylation independent mechanisms of NF-κB activation. In this present review, structural and functional differences between Tax-1 and Tax-2 will be summarized. Specifically, we will address their subcellular localization, nuclear trafficking and their effect on cellular regulatory proteins. A special attention will be given to Tax-1/Tax-2 post-translational modification such as ubiquitylation, SUMOylation, phosphorylation, acetylation, NF-κB activation, and protein–protein interactions involved in oncogenecity both in vivo and in vitro.
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Affiliation(s)
- Margret Shirinian
- Department of Internal Medicine, Faculty of Medicine, American University of Beirut Beirut, Lebanon
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Treviño A, Aguilera A, Caballero E, Benito R, Parra P, Eiros JM, Hernandez A, Calderón E, Rodríguez M, Torres A, García J, Ramos JM, Roc L, Marcaida G, Rodríguez C, Trigo M, Gomez C, de Lejarazu RO, de Mendoza C, Soriano V. Trends in the prevalence and distribution of HTLV-1 and HTLV-2 infections in Spain. Virol J 2012; 9:71. [PMID: 22444832 PMCID: PMC3337814 DOI: 10.1186/1743-422x-9-71] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Accepted: 03/23/2012] [Indexed: 11/24/2022] Open
Abstract
Background Although most HTLV infections in Spain have been found in native intravenous drug users carrying HTLV-2, the large immigration flows from Latin America and Sub-Saharan Africa in recent years may have changed the prevalence and distribution of HTLV-1 and HTLV-2 infections, and hypothetically open the opportunity for introducing HTLV-3 or HTLV-4 in Spain. To assess the current seroprevalence of HTLV infection in Spain a national multicenter, cross-sectional, study was conducted in June 2009. Results A total of 6,460 consecutive outpatients attending 16 hospitals were examined. Overall, 12% were immigrants, and their main origin was Latin America (4.9%), Africa (3.6%) and other European countries (2.8%). Nine individuals were seroreactive for HTLV antibodies (overall prevalence, 0.14%). Evidence of HTLV-1 infection was confirmed by Western blot in 4 subjects (prevalence 0.06%) while HTLV-2 infection was found in 5 (prevalence 0.08%). Infection with HTLV types 1, 2, 3 and 4 was discarded by Western blot and specific PCR assays in another two specimens initially reactive in the enzyme immunoassay. All but one HTLV-1 cases were Latin-Americans while all persons with HTLV-2 infection were native Spaniards. Conclusions The overall prevalence of HTLV infections in Spain remains low, with no evidence of HTLV-3 or HTLV-4 infections so far.
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Affiliation(s)
- Ana Treviño
- Infectious Diseases Department, Hospital Carlos III, Calle Sinesio Delgado 10, Madrid 28029, Spain.
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[Infection by HIV-2, HTLV and new human retroviruses in Spain]. Med Clin (Barc) 2011; 138:541-4. [PMID: 21565368 DOI: 10.1016/j.medcli.2011.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2011] [Accepted: 03/01/2011] [Indexed: 12/17/2022]
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Abad M, Dronda F, Dominguez E, Moreno S, Vallejo A. HTLV-2b among HIV type 1-coinfected injecting drug users in Spain. AIDS Res Hum Retroviruses 2011; 27:579-83. [PMID: 20854172 DOI: 10.1089/aid.2010.0263] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Human T cell lymphotropic virus type 2 (HTLV-2) infection is endemic in the American Indian population and Pygmy tribes in Africa. Nevertheless, HTLV-2 infection has been predominantly detected in U.S. and European injecting drug users (IDU). Noteworthy is that the HTLV-2a subtype is the main circulating variant in North America and Eastern Europe whereas the HTLV-2b subtype is mainly found in Western Europe, particularly in Italy and Spain where coinfection with HIV-1 is frequent. Twelve Spanish subjects infected with HTLV-2 were recruited for the study. All of them were IDUs coinfected with HIV-1. Molecular epidemiology was done by sequencing the LTR, env, and tax regions and by generating phylogenetic trees. The present study showed that all the sequences belonged to the HTLV-2b subtype and were closely related to other Spanish and Portuguese reported sequences, clearly differentiated from those belonging to the HTLV-2a subtype from Eastern Europe. Therefore, infection with HTLV-2b remains prevalent in Spain based on previous studies.
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Affiliation(s)
- María Abad
- Laboratory of Molecular Immunovirology, Instituto Ramón y Cajal de Investigación Sanitario (IRYCIS), Hospital Ramón y Cajal, Madrid, Spain
| | - Fernando Dronda
- HIV Clinic, Department of Infectious Diseases, Instituto Ramón y Cajal de Investigación Sanitario (IRYCIS), Hospital Ramón y Cajal, Madrid, Spain
| | - Ester Dominguez
- Laboratory of Molecular Immunovirology, Instituto Ramón y Cajal de Investigación Sanitario (IRYCIS), Hospital Ramón y Cajal, Madrid, Spain
| | - Santiago Moreno
- HIV Clinic, Department of Infectious Diseases, Instituto Ramón y Cajal de Investigación Sanitario (IRYCIS), Hospital Ramón y Cajal, Madrid, Spain
| | - Alejandro Vallejo
- Laboratory of Molecular Immunovirology, Instituto Ramón y Cajal de Investigación Sanitario (IRYCIS), Hospital Ramón y Cajal, Madrid, Spain
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Treviño A, Aguilera A, Caballero E, Toro C, Eiros JM, de Lejarazu RO, Rodríguez-Calviño JJ, Tuset C, Gómez-Hernando C, Rodríguez-Iglesias M, Ramos JM, Rodríguez-Díaz JC, Benito R, Trigo M, García-Campello M, Calderón E, Garcia J, Rodríguez C, Soriano V. Seroprevalence of HTLV-1/2 infection among native and immigrant pregnant women in Spain. AIDS Res Hum Retroviruses 2009; 25:551-4. [PMID: 19544594 DOI: 10.1089/aid.2008.0268] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
HTLV-1=2 antenatal screening is not mandatory in European countries. The rapid increase in immigrants coming from areas endemic for HTLV-1 infection has compelled a review of this policy in Spain. From February 2006 to December 2007, a cross-sectional study was carried out in all pregnant women attended at 10 different Spanish hospitals. An enzyme immunoassay (EIA) was used to test serum HTLV-1=2 antibodies; reactive samples were further confirmed by Western blot and=or polymerase chain reaction. A total of 20,518 pregnant women were examined, of whom 18,266 (89%) were native Spaniards. Overall, 946 (4.6%) of the immigrants came from HTLV-1 endemic areas (mainly Central and South America and sub-Saharan Africa). Four samples were EIA seroreactive for HTLV-1=2, two of them in women infected with HTLV-1 coming from endemic areas. The other two women were infected with HTLV-2; one was an immigrant from Bolivia and another was a native Spaniard who admitted prior injection drug use and was HIV-1 positive. The overall HTLV-1=2 seroprevalence was 0.19 per 1000 (95% CI: 0.05-0.49=1000). For HTLV-1, the seroprevalence was 2.11 per 1000 (95% CI: 0.26-7.62=1000) in pregnant women from endemic areas. The seroprevalence of HTLV-1=2 infection is below 0.02% among pregnant women in Spain, and therefore universal screening for HTLV-1=2 infection in antenatal clinics is not warranted. However, HTLV-1=2 screening could be considered in pregnant women coming from endemic areas, in whom the rate of infection is nearly 1000-fold higher than in native Spaniards and are the only group infected with the more pathogenic HTLV-1.
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Affiliation(s)
- Ana Treviño
- Department of Infectious Diseases, Hospital Carlos III, Madrid
| | - Antonio Aguilera
- Department of Microbiology, Hospital Conxo, Santiago de Compostela, Spain
| | | | - Carlos Toro
- Department of Infectious Diseases, Hospital Carlos III, Madrid
| | - José M. Eiros
- Department of Microbiology, Hospital Clínico Universitario, Valladolid, Spain
| | | | | | - Concepción Tuset
- Department of Immunology, Hospital General Universitario, Valencia, Spain
| | - César Gómez-Hernando
- Department of Microbiology, Complejo Hospitalario Virgen de la Salud, Toledo, Spain
| | | | | | | | - Rafael Benito
- Department of Microbiology, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
| | - Matilde Trigo
- Department of Microbiology, Complejo Hospitalario, Pontevedra, Spain
| | | | - Enrique Calderón
- CIBER in Epidemiology and Public Health Hospital Universitario Virgen del Rocio Seville, Spain
| | - Juan Garcia
- Department of Microbiology, Hospital Cristal-Piñor, Orense, Spain
| | | | - Vincent Soriano
- Department of Infectious Diseases, Hospital Carlos III, Madrid
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Gudo ES, Abreu CM, Mussá T, Augusto ADR, Otsuki K, Chambo E, Amade N, Tanuri A, Ferreira OC, Jani IV. Serologic and molecular typing of human T-lymphotropic virus among blood donors in Maputo City, Mozambique. Transfusion 2009; 49:1146-50. [PMID: 19222818 DOI: 10.1111/j.1537-2995.2009.02100.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Screening for human T-lymphotropic virus-1/2 (HTLV-1/2) infection is not performed in blood banks in Mozambique. The aim was to determine the prevalence of HTLV-1/2 among blood donors of the Maputo Central Hospital Blood Bank and measure the coinfection rate of HTLV-1/2 with human immunodeficiency virus (HIV), hepatitis B virus (HBV), and syphilis. STUDY DESIGN AND METHODS A total of 2019 consecutive blood donors were screened for HTLV-1/2 antibodies, HIV-1/2 antibodies, hepatitis B surface antigen (HBsAg), and rapid plasma reagin (RPR) for syphilis. Specimens reactive on a first HTLV-1/2 enzyme immunoassay (EIA) were retested using a second EIA. Specimens that were dually reactive on both EIAs were further tested using Western blot (WB) and real-time polymerase chain reaction (PCR). RESULTS All 18 dually reactive specimens (0.89%; 95% confidence interval, 0.48%-1.30%) were positive for the presence of HTLV-1 by WB and real-time PCR. HTLV-2 was not detected. The prevalences of anti-HIV, HBsAg, and reactivity in the RPR test were 5.72, 6.01, and 0.98 percent, respectively. There was no significant association between HTLV-1 infection and demographic variables (age and sex) or serologic markers (HIV, HBsAg, and RPR). For the 17 HTLV-1-positive donors for whom serologic data for HIV, HBsAg, and syphilis RPR were available, 2 showed coinfection with HIV and 1 with HBV. CONCLUSION Compared to other infectious agents, HTLV-1 is present at relatively low levels among blood donors in Mozambique. Cost and logistics will present as major challenges for introducing HTLV-1/2 screening in blood banks. In blood banks in Southern Africa where EIA testing is possible, a sequential algorithm of two EIAs may be a cost-efficient option for HTLV-1/2 screening.
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Affiliation(s)
- Eduardo Samo Gudo
- Departamento de Imunologia, Instituto Nacional de Saúde, Maputo, Mozambique
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Toro C, Blanco F, Garcca-Gasco P, Sheldon J, Benito JM, Rallon NI, Soriano V. Human T Lymphotropic Virus Type 1-Associated Myelopathy/Tropical Spastic Paraparesis in an HIV-Positive Patient Coinfected with Human T Lymphotropic Virus Type 2 Following Initiation of Antiretroviral Therapy. Clin Infect Dis 2007; 45:e118-20. [DOI: 10.1086/522172] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Accepted: 07/05/2007] [Indexed: 11/03/2022] Open
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Zendri E, Pilotti E, Perez M, Turci M, Pinelli S, Ronzi P, Frontani M, Faraggiana T, De Panfilis G, Casoli C. The HTLV tax-like sequences in cutaneous T-cell lymphoma patients. J Invest Dermatol 2007; 128:489-92. [PMID: 17762859 DOI: 10.1038/sj.jid.5701034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
HTLV-1 and HTLV-2 are highly related complex retroviruses that have been studied intensely for nearly three decades because of their association with neoplasia, neuropathology, and/or their capacity to transform primary human T lymphocytes. The study of HTLV also represents an attractive model that has allowed investigators to dissect the mechanism of various cellular processes, several of which may be critical steps in HTLV-mediated pathogenesis. Both HTLV-1 and HTLV-2 can efficiently immortalize and transform T lymphocytes in cell culture and persist in infected individuals or experimental animals. However, the clinical manifestations of these two viruses differ significantly. HTLV-1 is associated with adult T-cell leukemia (ATL) and a variety of immune-mediated disorders including the chronic neurological disease termed HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). In contrast, HTLV-2 is much less pathogenic with reports of only a few cases of variant hairy cell leukemia and neurological disease associated with infection. The limited number of individuals shown to harbor HTLV-2 in association with specific diseases has, to date, precluded convincing epidemiological demonstration of a definitive etiologic role of HTLV-2 in human disease. Therefore, it has become clear that comparative studies designed to elucidate the mechanisms by which HTLV-1 and HTLV-2 determine distinct outcomes are likely to provide fundamental insights into the initiation of multistep leukemogenesis.
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Affiliation(s)
- Gerold Feuer
- Department of Microbiology and Immunology, SUNY Upstate Medical University, Syracuse, New York 13210, USA
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