HTLV-1 and Co-infections

被引:33
作者
Rosadas, Carolina [1 ]
Taylor, Graham P. [1 ,2 ]
机构
[1] Imperial Coll London, Sect Virol, Dept Infect Dis, London, England
[2] Imperial Coll Healthcare NHS Trust, St Marys Hosp, Div Med & Integrated Care, Natl Ctr Human Retrovirol, London, England
关键词
HTLV-1; co-infection; Mycobacterium tuberculosis; Mycobacterium leprae; HCV; HBV; sexually transmitted infections; Schistosoma mansoni; T-LYMPHOTROPIC VIRUS; HEPATITIS-C VIRUS; HUMAN-IMMUNODEFICIENCY-VIRUS; CRUSTED NORWEGIAN SCABIES; CELL LEUKEMIA-LYMPHOMA; TYPE-1; INFECTION; LEPROSY PATIENTS; I CARRIERS; PULMONARY TUBERCULOSIS; PROBABLE ASSOCIATION;
D O I
10.3389/fmed.2022.812016
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Human T lymphotropic virus type 1 (HTLV-1) is a retrovirus that causes lifelong T-cell infection in humans, impacting the host immune response. This virus causes a range of clinical manifestations, from inflammatory conditions, including neuronal damage (HTLV-1 associated myelopathy, HAM) to life-threatening leukemia (adult T-cell leukemia, ATL). Human T lymphotropic virus type 1 is also associated with increased risk of all-cause mortality, but the mechanisms remain unclear. As a blood-borne and sexually transmitted infection (STI), HTLV-1 shares transmission routes to many other pathogens and although it has worldwide distribution, it affects mainly those in low- and middle-income tropical areas, where the prevalence of other infectious agents is high. These factors contribute to a high incidence of co-infections in people living with HTLV-1 (PLHTLV). This comprehensive review addresses the impact of HTLV-1 on several co-infections and vice-versa. There is evidence of higher rates of HTLV-1 infection in association with other blood borne (HCV, HBV) and sexually transmitted (Syphilis, Chlamydia, HPV, HSV) infections but whether this represents increased susceptibility or opportunity is unclear. Higher frequency of Mycobacterium tuberculosis (MTb) and Mycobacterium leprae (M. leprae) is observed in PLHTLV. Reports of opportunistic infections and high frequency of crusted scabies in patients with HTLV-1 points to immune impairment in those individuals. Human T lymphotropic virus type 1 may influence the persistence of pathogens, exemplified by the higher rates of Schistosoma mansoni and Strongyloides stercoralis (St. stercoralis) treatment failure observed in PLHTLV. This retrovirus is also associated with increased tuberculosis (TB) severity with some evidence pointing to a deleterious impact on leprosy outcome as well. These findings are supported by immune alterations observed in those co-infected individuals. Although the role of HTLV-1 in HCV outcome is debatable, most data indicate that HTLV may negatively impact the clinical course of hepatitis C. Co-infections may also influence the risk of developing HTLV-1 associated disease, but data are still limited. The impact of HTLV-1 on the response to more common infections, might contribute to the increased mortality rate of HTLV-1. Large scale prospective controlled studies on the prevalence and impact of HTLV-1 in co-infections and vice-versa are needed. Human T lymphotropic virus type 1 impact in public health is broad. Measures to increase awareness and to prevent new infections are needed.
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页数:14
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