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HIV Vaccine

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https://www.readbyqxmd.com/read/29036415/transfusion-transmissible-infections-among-walk-in-blood-donors-at-kisumu-regional-blood-transfusion-centre-kisumu-county-kenya-2015
#1
Dominic Wamamba, Dickens Onyango, Elvis Oyugi, Evalyne Kanyina, Mark Obonyo, Jane Githuku, James Ransom
Background: Transfusion transmissible infections (TTIs) are threats to blood safety. This study investigated TTIs among volunteer blood donors at the Kisumu Regional Blood Transfusion Centre (KRBTC) in Kenya. Methods: We performed a retrospective record review of blood donor registers at KRBTC, 2015. Walk-in donors accepted for donation were analyzed to determine prevalence of human immunodeficiency virus (HIV), hepatitis B (HBV), hepatitis C (HCV), and syphilis...
September 23, 2017: Laboratory Medicine
https://www.readbyqxmd.com/read/29036227/evolution-of-hepatitis-a-virus-seroprevalence-among-hiv-positive-adults-in-taiwan
#2
Yu-Lin Lee, Kuan-Yin Lin, Chien-Yu Cheng, Chia-Wen Li, Chia-Jui Yang, Mao-Song Tsai, Hung-Jen Tang, Te-Yu Lin, Ning-Chi Wang, Yi-Chien Lee, Shih-Ping Lin, Yu-Shan Huang, Hsin-Yun Sun, Jun-Yu Zhang, Wen-Chien Ko, Shu-Hsing Cheng, Yuan-Ti Lee, Chun-Eng Liu, Chien-Ching Hung
OBJECTIVES: The study aimed to describe the seroprevalence of hepatitis A virus (HAV) in HIV-positive adult patients in Taiwan between 2012 and 2016 and to examine the evolution of HAV seroprevalence between 2004-2007 and 2012-2016. METHODS: Clinical information and data of anti-HAV antibody results were collected from 2,860 antiretroviral-naïve HIV-positive Taiwanese aged 18 years or older who initiated combination antiretroviral therapy at 11 hospitals around Taiwan between 2012 and 2016 (2012-2016 cohort)...
2017: PloS One
https://www.readbyqxmd.com/read/29035947/cross-reactivity-of-hiv-vaccine-responses-and-the-microbiome
#3
Wilton B Williams, Qifeng Han, Barton F Haynes
PURPOSE OF REVIEW: A successful HIV-type 1 (HIV-1) vaccine will require immunogens that induce protective immune responses. However, recent studies suggest that the response to HIV-1 and perhaps other viruses may be altered by immune system exposure to intestinal microbiota-antigens. This review will discuss select aspects of these studies. RECENT FINDINGS: Naïve CD4 T and B cell repertoires can be imprinted by intestinal microbiota-antigens to respond to virus epitopes prior to virus infection...
October 14, 2017: Current Opinion in HIV and AIDS
https://www.readbyqxmd.com/read/29035163/uptake-and-correlates-of-cervical-cancer-screening-among-hiv-infected-women-attending-hiv-care-in-uganda
#4
Rhoda K Wanyenze, John Baptist Bwanika, Jolly Beyeza-Kashesya, Shaban Mugerwa, Jim Arinaitwe, Joseph K B Matovu, Violet Gwokyalya, Dickson Kasozi, Justine Bukenya, Fred Makumbi
BACKGROUND: Human immunodeficiency virus (HIV)-infected women are at high risk of cervical cancer. OBJECTIVE: This study assessed uptake and correlates of cervical screening among HIV-infected women in care in Uganda. METHODS: A nationally representative cross-sectional survey of HIV-infected women in care was conducted from August to November 2016. Structured interviews were conducted with 5198 women aged 15-49 years, from 245 HIV clinics...
2017: Global Health Action
https://www.readbyqxmd.com/read/29033936/coinhibitory-receptor-expression-and-immune-checkpoint-blockade-maintaining-a-balance-in-cd8-t-cell-responses-to-chronic-viral-infections-and-cancer
#5
REVIEW
Isobel S Okoye, Michael Houghton, Lorne Tyrrell, Khaled Barakat, Shokrollah Elahi
In cancer and chronic viral infections, T cells are exposed to persistent antigen stimulation. This results in expression of multiple inhibitory receptors also called "immune checkpoints" by T cells. Although these inhibitory receptors under normal conditions maintain self-tolerance and prevent immunopathology, their sustained expression deteriorates T cell function: a phenomenon called exhaustion. Recent advances in cancer immunotherapy involve blockade of cytotoxic T lymphocyte antigen-4 and programmed cell death 1 in order to reverse T cell exhaustion and reinvigorate immunity, which has translated to dramatic clinical remission in many cases of metastatic melanoma and lung cancer...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29030661/identification-of-the-major-histocompatibility-complex-class-ii-dm-and-do-alleles-in-a-cohort-of-northern-pig-tailed-macaques-macaca-leonina
#6
Xiao-Dong Lian, Xi-He Zhang, Zheng-Xi Dai, Yong-Tang Zheng
The northern pig-tailed macaque (Macaca leonina) has been considered as an independent species from the pig-tailed macaque group. We have previously reported that this species macaque has the potential to be a useful animal model in HIV/AIDS pathogenesis and vaccine studies due to its susceptibility to HIV-1. To develop this animal into a potential HIV/AIDS model, we have studied the classical MHC genes of this animal. In this study, the non-classical MHC genes Malo-DM and Malo-DO alleles were first characterized by sequencing and cloning in 12 unrelated northern pig-tailed macaques...
October 13, 2017: Immunogenetics
https://www.readbyqxmd.com/read/29030149/clinical-management-of-women-presenting-with-field-effect-of-hpv-and-intraepithelial-disease
#7
REVIEW
T S Adams, N H Mbatani
Anogenital human papillomavirus is the most common sexually transmitted infection acquired through skin-to-skin contact. Most infections are cleared by an intact immune system. Persistence of these infections results in precancerous lesions and, eventually, to cancers of the cervix, vagina, vulva, and perianal area. The introduction of the prophylactic human papilloma virus (HPV) vaccinations may reduce the incidence of these infections, but the effect of these vaccinations will be seen only in the decades that follow...
September 6, 2017: Best Practice & Research. Clinical Obstetrics & Gynaecology
https://www.readbyqxmd.com/read/29029940/antibody-dependent-phagocytosis-adp-responses-following-trivalent-inactivated-influenza-vaccination-of-younger-and-older-adults
#8
Fernanda Ana-Sosa-Batiz, Angus P R Johnston, P Mark Hogarth, Bruce D Wines, Ian Barr, Adam K Wheatley, Stephen J Kent
Globally the most commonly utilised immunisation against influenza is the trivalent inactivated influenza vaccine (TIV) derived from an A/H1N1, an A/H3N2 and aB type influenza virus. Vaccine effectiveness of TIV varies year to year, depending on how well antigenically matched the strains in the vaccine are compared to circulating strains [1,2]. Moreover, vaccine effectiveness can vary within certain subpopulations such as HIV-positive, young children and the elderly. Decreased vaccine effectiveness in the elderly is associated with impaired Ab production, as measured by standard hemagglutination inhibition (HAI) assays...
October 10, 2017: Vaccine
https://www.readbyqxmd.com/read/29028973/safety-and-immunogenicity-of-newborn-mva85a-vaccination-and-selective-delayed-bacille-calmette-guerin-bcg-for-infants-of-hiv-infected-mothers-a-phase-2-randomized-controlled-trial
#9
Elisa Nemes, Anneke C Hesseling, Michele Tameris, Katya Mauff, Katrina Downing, Humphrey Mulenga, Penelope Rose, Marieke van der Zalm, Sharon Mbaba, Danelle Van As, Willem A Hanekom, Gerhard Walzl, Thomas J Scriba, Helen McShane, Mark Hatherill
Background: Vaccination of HIV-infected infants with bacille Calmette-Guérin (BCG) is contraindicated. HIV-exposed newborns need a new tuberculosis (TB) vaccination strategy that protects against TB early in life; and avoids the potential risk of BCG disease until after HIV infection has been excluded. Methods: This double-blind randomized controlled trial compared newborn MVA85A prime vaccination (1 x10 8 PFU) vs. Candin® control, followed by selective deferred BCG vaccination at 8 weeks of age for HIV-uninfected infants, and 12 months follow-up for safety and immunogenicity...
September 26, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29028943/a-joint-model-for-mixed-and-truncated-longitudinal-data-and-survival-data-with-application-to-hiv-vaccine-studies
#10
Tingting Yu, Lang Wu, Peter B Gilbert
In HIV vaccine studies, a major research objective is to identify immune response biomarkers measured longitudinally that may be associated with risk of HIV infection. This objective can be assessed via joint modeling of longitudinal and survival data. Joint models for HIV vaccine data are complicated by the following issues: (i) left truncations of some longitudinal data due to lower limits of quantification; (ii) mixed types of longitudinal variables; (iii) measurement errors and missing values in longitudinal measurements; (iv) computational challenges associated with likelihood inference...
September 23, 2017: Biostatistics
https://www.readbyqxmd.com/read/29028655/potency-of-hiv-2-specific-antibodies-increase-in-direct-association-with-loss-of-memory-b-cells
#11
Cheila Rocha, Joana Duarte, Pedro Borrego, Rita Calado, José M Marcelino, Rita Tendeiro, Emília Valadas, Ana E Sousa, Nuno Taveira
: Potent HIV neutralizing antibodies are critical for vaccination and viral reservoir control. High levels of neutralizing antibodies characterize HIV-2 infection, a naturally-occurring model of attenuated HIV disease with low to undectable viremia. We found that HIV-2-specific antibody potency increased in direct association with the loss of both switched and unswitched memory B-cells in untreated HIV-2 infection. Thus, HIV antibody affinity maturation is linked to memory B-cell exhaustion even in reduced viremia settings...
October 12, 2017: AIDS
https://www.readbyqxmd.com/read/29028455/health-indicators-for-older-sexual-minorities-national-health-interview-survey-2013-2014
#12
Christina N Dragon, Alison M Laffan, Erkan Erdem, Sean Cahill, Daniel Kenefick, Jiahui Ye, Samuel C Haffer
PURPOSE: Advances in lesbian, gay, and bisexual (sexual minority [SM]) acceptance and equality have been made in the past decade. However, certain SM subgroups continue to be disadvantaged due to lack of data and, thus, lack of knowledge about these populations. Data for older sexual minorities are especially lacking and will be increasingly important as more sexual minorities enter older age. This research explores results from a nationally representative health survey to elucidate some health indicators for older sexual minorities...
October 13, 2017: LGBT Health
https://www.readbyqxmd.com/read/29027811/prevention-of-human-papillomavirus-hpv-related-tumors-in-people-living-with-human-immunodeficiency-virus-hiv
#13
Mario Poljak, Anja Šterbenc, Maja M Lunar
In comparison to their HIV-negative counterparts, people living with HIV (PLWH) have a higher prevalence of human papillomavirus (HPV) infection in various anatomical sites coupled with increased HPV persistence, higher risk of HPV-related tumors, and faster disease progression. Areas covered: Gender-neutral prevention strategies for HPV-related cancers in PLWH discussed: ABC approach, HPV vaccination, antiretroviral treatment (ART), anal cancer screening, and smoking cessation. Gender specific strategies: cervical cancer screening reduces the incidence and mortality of cervical cancer and circumcision might reduce the risk of HPV infections in men...
October 13, 2017: Expert Review of Anti-infective Therapy
https://www.readbyqxmd.com/read/29026141/combined-skin-and-muscle-vaccination-differentially-impact-the-quality-of-effector-t-cell-functions-the-cuthivac-001-randomized-trial
#14
G Haidari, A Cope, A Miller, S Venables, C Yan, H Ridgers, K Reijonen, D Hannaman, A Spentzou, P Hayes, G Bouliotis, A Vogt, S Joseph, B Combadiere, S McCormack, R J Shattock
Targeting of different tissues via transcutaneous (TC), intradermal (ID) and intramuscular (IM) injection has the potential to tailor the immune response to DNA vaccination. In this Phase I randomised controlled clinical trial in HIV-1 negative volunteers we investigate whether the site and mode of DNA vaccination influences the quality of the cellular immune responses. We adopted a strategy of concurrent immunization combining IM injection with either ID or TC administration. As a third arm we assessed the response to IM injection administered with electroporation (EP)...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29022569/syphilis
#15
REVIEW
Rosanna W Peeling, David Mabey, Mary L Kamb, Xiang-Sheng Chen, Justin D Radolf, Adele S Benzaken
Treponema pallidum subspecies pallidum (T. pallidum) causes syphilis via sexual exposure or via vertical transmission during pregnancy. T. pallidum is renowned for its invasiveness and immune-evasiveness; its clinical manifestations result from local inflammatory responses to replicating spirochaetes and often imitate those of other diseases. The spirochaete has a long latent period during which individuals have no signs or symptoms but can remain infectious. Despite the availability of simple diagnostic tests and the effectiveness of treatment with a single dose of long-acting penicillin, syphilis is re-emerging as a global public health problem, particularly among men who have sex with men (MSM) in high-income and middle-income countries...
October 12, 2017: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/29022533/distribution-of-hepatitis-b-virus-infection-in-namibia
#16
P Mhata, T W Rennie, L F Small, P M Nyarang'o, Z Chagla, C J Hunter
BACKGROUND: Namibia regards hepatitis B virus (HBV) infection as a public health problem and introduced hepatitis B vaccinations for infants during 2009. However, information on HBV infection in the country remains limited, and effective public health interventions may be compromised in the absence of adequate evidence-based data. Available data from the World Health Organization (WHO) estimate that 15 - 60% of the normal population in many African countries may be positive for one or more of the HBV serological markers...
September 22, 2017: South African Medical Journal, Suid-Afrikaanse Tydskrif Vir Geneeskunde
https://www.readbyqxmd.com/read/29021601/novel-vaccine-vectors-for-hiv-1
#17
Dan H Barouch, Louis J Picker
No abstract text is available yet for this article.
October 12, 2017: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/29021402/hiv-exposed-infants-vaccinated-with-a-mf59-rgp120-vaccine-have-higher-magnitude-anti-v1v2-igg-responses-than-adults-immunized-with-the-same-vaccine
#18
Erin P McGuire, Youyi Fong, Christopher Toote, Coleen K Cunningham, Elizabeth J McFarland, William Borkowsky, Susan Barnett, Hannah L Itell, Amit Kumar, Glenda Gray, M Julianna McElrath, Georgia D Tomaras, Sallie R Permar, Genevieve G Fouda
In the RV144 vaccine trial, IgG responses against the HIV envelope variable loops 1 and 2 (V1V2) were associated with decreased HIV acquisition risk. We previously reported that infants immunized with a MF59 adjuvanted rgp120 vaccine developed higher magnitude anti-V1V2 IgG responses than adult RV144 vaccinees. To determine if the robust antibody response in infants is due to differences in vaccine regimens or to inherent differences between the adult and infant immune systems, we compared Env-specific IgG responses in adults and infants immunized with the same MF59 and Alum adjuvanted HIV envelope vaccines...
October 11, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29021394/hiv-1-gp120-protein-and-mvagp140-boost-immunogens-increase-immunogenicity-of-a-dna-mva-hiv-1-vaccine
#19
Xiaoying Shen, Rahul Basu, Sheetal Sawant, David Beaumont, Sue Fen Kwa, Celia LaBranche, Kelly E Seaton, Nicole L Yates, David C Montefiori, Guido Ferrari, Linda S Wyatt, Bernard Moss, S Munir Alam, Barton F Haynes, Georgia D Tomaras, Harriet L Robinson
An important goal of human immunodeficiency virus (HIV) vaccine design is identification of strategies that elicit effective antiviral humoral immunity. One novel approach comprises priming with DNA and boosting with modified vaccinia Ankara (MVA) expressing HIV-1 Env on virus like particles. Here we evaluated whether the addition of a gp120 protein in alum or MVA expressed secreted gp140 (MVAgp140) could improve immunogenicity of a DNA prime - MVA boost vaccine. Five rhesus macaques per group received two DNA primes at weeks 0 and 8 followed by three MVA boosts (with or without additional protein or MVAgp140) at weeks 18, 26 and 40...
October 11, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29020090/saporin-conjugated-tetramers-identify-efficacious-anti-hiv-cd8-t-cell-specificities
#20
Ellen M Leitman, Christine D Palmer, Søren Buus, Fabian Chen, Lynn Riddell, Stuart Sims, Paul Klenerman, Asier Sáez-Cirión, Bruce D Walker, Paul R Hess, Marcus Altfeld, Philippa C Matthews, Philip J R Goulder
Antigen-specific T-cells are highly variable, spanning potent antiviral efficacy and damaging auto-reactivity. In virus infections, identifying the most efficacious responses is critical to vaccine design. However, current methods depend on indirect measures or on ex vivo expanded CTL clones. We here describe a novel application of cytotoxic saporin-conjugated tetramers to kill antigen-specific T-cells without significant off-target effects. The relative efficacy of distinct antiviral CD8+ T-cell specificity can be directly assessed via antigen-specific CD8+ T-cell depletion...
2017: PloS One
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