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Clinical and Vaccine Immunology: CVI

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https://www.readbyqxmd.com/read/28592628/chemiluminescence-immunoassay-for-the-detection-of-antibodies-against-the-2c-and-3abc-nonstructural-proteins-induced-by-infecting-pigs-with-the-foot-and-mouth-disease-virus
#1
Zezhong Liu, Junjun Shao, Furong Zhao, Guangqing Zhou, Shandian Gao, Wei Liu, Jianliang Lv, Xiumei Li, Yangfan Li, Huiyun Chang, Yongguang Zhang
The potential diagnostic value of chemiluminescence immunoassays (CLIAs) has been accepted in recent years, although its use for foot-and-mouth disease (FMD) diagnostics has not been reported. Full-length 3ABC and 2C proteins were expressed in bacteria and purified by affinity chromatography to develop a rapid and accurate approach to distinguish pigs infected with foot-and-mouth disease virus (FMDV) from vaccinated pigs (DIVA). The recombinant proteins were then used as antigens to develop two CLIAs for the detection of antibodies against nonstructural viral proteins...
June 7, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28592627/cytokines-are-markers-of-the-clostridium-difficile-induced-inflammatory-response-and-predict-disease-severity
#2
Hua Yu, Kevin Chen, Ying Sun, Mihaela Carter, Kevin W Garey, Tor C Savidge, Sridevi Devaraj, Mary Elizabeth Tessier, Erik C von Rosenvinge, Ciaran P Kelly, Marcela F Pasetti, Hanping Feng
The host immune response affects pathogen virulence in Clostridium difficile infection (CDI). Thus, cytokine responses to CDI are likely associated with disease initiation and progression. Understanding the molecular drivers of inflammation and biochemical markers of disease severity are important for developing novel therapies and predicting the disease prognosis. In this study, we investigated cytokine production in patients with CDI and evaluated the potential of cytokines to serve as biomarkers for CDI and predictors of disease severity...
June 7, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28592626/longitudinal-ip-10-serum-levels-are-associated-with-the-course-of-disease-activity-and-remission-in-rheumatoid-arthritis
#3
Anouk van Hooij, Debbie M Boeters, Elisa M Tjon Kon Fat, Susan J F van den Eeden, Paul L A M Corstjens, Annette H M van der Helm-van Mil, Annemieke Geluk
Although Rheumatoid arthritis (RA) is a chronic, persistent autoimmune disease 10-15% of the RA patients achieve sustained disease modifying anti-rheumatic drugs (DMARD)-free remission over time. Biological mechanisms underlying the resolution of persistent inflammation in RA are yet unidentified and prognostic markers are lacking.It is well established that increased serum levels of IFN-γ-induced protein 10 (IP-10) are associated with (acute) increased inflammatory responses (e.g. in leprosy). In order to assess the potential of IP-10 as a diagnostic tool for inflammatory episodes in RA, we performed a retrospective study and assessed IP-10 levels in longitudinally banked serum samples of patients upon first diagnosis of RA...
June 7, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28566336/maternal-humoral-immune-correlates-of-peripartum-transmission-of-clade-c-hiv-1-in-the-setting-of-peripartum-antiretrovirals
#4
Charmaine P Mutucumarana, Joshua Eudailey, Erin P McGuire, Nathan Vandergrift, Gerald Tegha, Charles Chasela, Sascha Ellington, Charles van der Horst, Athena P Kourtis, Sallie R Permar, Genevieve G Fouda
Despite widespread use of antiretrovirals (ARV), more than 150,000 pediatric HIV-1 infections continue to occur annually. Supplemental strategies are necessary to eliminate pediatric HIV infections. We previously reported that maternal HIV envelope-specific anti-V3 IgG, CD4 binding site-directed antibodies, and tier 1 virus neutralization predicted reduced risk of mother-to-child transmission of HIV-1 (MTCT) in the pre-ARV era US-based Women and Infants Transmission Study (WITS) cohort. As the majority of ongoing pediatric HIV infections occur in sub-Saharan Africa, we sought to determine if the same maternal humoral immune correlates predicted MTCT in a subset of the Malawian Breastfeeding, Antiretrovirals, and Nutrition (BAN) cohort of HIV-infected mothers (n=88, 45 transmitting and 43 non-transmitting)...
May 31, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28566335/breadth-and-duration-of-meningococcal-serum-bactericidal-activity-in-healthcare-workers-and-microbiologists-immunized-with-the-menb-fhbp-vaccine
#5
Eduardo Lujan, Elizabeth Partridge, Serena Giuntini, Sanjay Ram, Dan M Granoff
Background. MenB-FHbp is a meningococcal serogroup B vaccine with two Factor H binding protein (FHbp) antigens from subfamilies A and B. For licensure, efficacy was inferred from serum bactericidal antibody (SBA) responses against four reference strains. Only limited information is available on breadth or duration of protective SBA responses against genetically diverse disease-causing strains.Methods. Seventeen healthcare or laboratory workers were immunized with two (N=2) or three (N=15) doses of MenB-FHbp at 0, 2 and 6 months...
May 31, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28566334/antibody-based-correlates-of-protection-against-cholera-analysis-of-a-challenge-study-in-a-cholera-na%C3%A3-ve-population
#6
Douglas J Haney, Michael D Lock, Jakub K Simon, Jason Harris, Marc Gurwith
Immunologic correlates of protection can be used to infer vaccine efficacy for populations in which challenge trials or field studies are infeasible. In a recent cholera challenge trial (WH Cohen et al, Clinical Infectious Disease 62: 1329-1335, 2016), 134 North American cholera-naïve volunteers were randomized to receive either the live, attenuated single-dose cholera vaccine CVD 103-HgR or placebo, and titers of vibriocidal antibodies against classical Inaba were assessed 10 days after treatment. Subsequent to the immunologic evaluation, each subject ingested a fixed quantity of virulent V...
May 31, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28515136/loss-of-humoral-and-cellular-immunity-to-invasive-nontyphoidal-salmonella-during-current-or-convalescent-plasmodium-falciparum-infection-in-malawian-children
#7
Tonney S Nyirenda, James T Nyirenda, Dumizulu L Tembo, Janet Storm, Queen Dube, Chisomo L Msefula, Kondwani C Jambo, Henry C Mwandumba, Robert S Heyderman, Melita A Gordon, Wilson L Mandala
Invasive nontyphoidal Salmonella (iNTS) infections are commonly associated with Plasmodium falciparum infections, but the immunologic basis for this linkage is poorly understood. We hypothesized that P. falciparum infection compromises the hosts' humoral and cellular immunity to NTS which increases their susceptibility to iNTS infection. We prospectively recruited children aged between 6 and 60 months at a Community Health Centre in Blantyre, Malawi and allocated them to the following groups; febrile with uncomplicated malaria, febrile malaria-negative, non-febrile malaria-negative...
May 17, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28515135/not-all-antigens-are-created-equally-progress-challenges-and-lessons-associated-with-developing-a-vaccine-for-leishmaniasis
#8
Malcolm S Duthie, Steven G Reed
From experimental models and the analyses of patients, it is well documented that antigen-specific T cells are critical for protection against Leishmania infection. Effective vaccines require both targeting to the pathogen and an immune stimulant to induce maturation of appropriate immune responses. While a great number of antigens have been examined as vaccine candidates across various Leishmania species, few have advanced to human or canine clinical trials. With emphasis on antigen expression, in this minireview we discuss some the vaccine platforms that are currently being explored for the development of Leishmania vaccines...
May 17, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28515134/identification-of-novel-seroreactive-antigens-in-johne-s-disease-cattle-using-the-mycobacterium-tuberculosis-protein-array
#9
John P Bannantine, Joseph J Campo, Lingling Li, Arlo Randall, Jozelyn Pablo, Craig A Praul, Juan Antonio Raygoza Garay, Judith R Stabel, Vivek Kapur
Johne's Disease, a chronic gastrointestinal inflammatory disease caused by Mycobacterium avium subspecies paratuberculosis (Map), is endemic in dairy cattle and other ruminants worldwide and remains a challenge to diagnose using traditional serological methods. Given the close phylogenetic relationship between Map and the human pathogen, Mycobacterium tuberculosis (Mtb), we here applied a whole proteome Mtb protein array to identify seroreactive and diagnostic Map antigens. A genome-scale pairwise analysis of amino acid identity between orthologous proteins in Map and Mtb showed an average of 62% identity, with more than half the orthologous proteins sharing > 75% identity...
May 17, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28515133/development-of-a-novel-virus-like-particle-vaccine-platform-that-mimics-immature-form-of-alphavirus
#10
Akane Urakami, Atsuko Sakurai, Momoko Ishikawa, Moh Lan Yap, Yevel Flores-Garcia, Yasunari Haseda, Taiki Aoshi, Fidel P Zavala, Michael G Rossmann, Sachiko Kuno, Ryuji Ueno, Wataru Akahata
Virus-like particles (VLPs) are non-infectious multiprotein structures that are engineered to self-assemble from viral structural proteins. Here, we developed a novel VLP-based vaccine platform utilizing VLPs from the Chikungunya virus. We identified two regions within the envelope protein, a structural component of Chikungunya, where foreign antigens can be inserted without compromising VLP structure. Our VLP displays 480 copious copies of an inserted antigen on the VLP surface in a highly symmetric manner, thus capable of inducing strong immune responses against any inserted antigen...
May 17, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28490424/waning-immunity-and-microbial-vaccines-workshop-of-the-national-institute-of-allergy-and-infectious-diseases
#11
Xin-Xing Gu, Stanley A Plotkin, Kathryn M Edwards, Alessandro Sette, Kingston H G Mills, Ofer Levy, Andrea J Sant, Annie Mo, William Alexander, Kristina T Lu, Christopher E Taylor
Since the middle of the 20th century, vaccines have made a significant public health impact controlling infectious diseases globally. Although long-term protection has been achieved with some vaccines, immunity wanes over time with others, resulting in outbreaks or epidemics of infectious diseases. Long-term protection against infectious agents with complex life cycles and antigenic variation remains a key challenge. Novel strategies to characterize the short and long-term immune responses to vaccines, and to induce immune responses that mimic natural infection have recently emerged...
May 10, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28468981/hnl-human-neutrophil-lipocalin-in-activated-whole-blood-is-a-specific-and-rapid-diagnostic-biomarker-of-bacterial-infections-in-the-respiratory-tract
#12
Per Venge, Ann-Katrin Eriksson, Lena Douhan-Håkansson, Karlis Pauksen
The distinction between bacterial and viral causes of infections of the respiratory tract is a major but important clinical challenge. We investigated the diagnostic performance of Human Neutrophil Lipocalin (HNL) in respiratory tract infections in comparison to CRP and procalcitonin (PCT). METHODS: Patients were recruited from the emergency department and from a primary care unit (n=162). The clinical diagnosis as to bacterial or viral causes of the infection was complemented with objective microbiological/serological testing...
May 3, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28468980/identification-of-protective-b-cell-epitopes-within-the-novel-malaria-vaccine-candidate-p-falciparum-schizont-egress-antigen-1
#13
Christina E Nixon, Sangshin Park, Sunthorn Pond-Tor, Dipak Raj, Lynn E Lambert, Sachy Orr-Gonzales, Emma K Barnafo, Jennifer F Friedman, Michal Fried, Patrick E Duffy, Jonathan D Kurtis
Naturally-acquired antibodies to PfSEA-1A are associated with protection against severe malaria in children. Vaccination of mice with PbSEA-1A decreases parasitemia and prolongs survival following Plasmodium berghei ANKA challenge. To enhance the immunogenicity of PfSEA-1A, we identified five linear, B-cell epitopes using peptide microarrays probed with anti-sera from rPfSEA-1A-vaccinated non-human primates. We evaluated the relationship between epitope-specific antibody levels and protection from parasitemia in a longitudinal treatment-reinfection cohort in Western Kenya...
May 3, 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28446441/long-term-persistence-of-cell-mediated-and-humoral-responses-to-a-h1n1-pdm09-influenza-virus-vaccines-and-the-role-of-the-as03-adjuvant-system-in-adults-during-two-randomized-controlled-trials
#14
Robbert G van der Most, Frédéric Clément, Julie Willekens, Walthère Dewé, Karl Walravens, David W Vaughn, Geert Leroux-Roels
We investigated the role of AS03A (here AS03), an α-tocopherol oil-in-water emulsion-based adjuvant system, on the long-term persistence of humoral and cell-mediated immune responses to A(H1N1)pdm09 influenza vaccines. In two studies, a total of 261 healthy adults (≤60 years old) were randomized to receive two doses of AS03-adjuvanted vaccine containing 3.75 μg of hemagglutinin (HA) or nonadjuvanted vaccine containing 15 μg of hemagglutinin (in study A) or 3.75 μg of hemagglutinin (in study B) 21 days apart...
June 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28424198/pneumococcal-capsular-polysaccharide-immunity-in-the-elderly
#15
REVIEW
Hugh Adler, Daniela M Ferreira, Stephen B Gordon, Jamie Rylance
Immunity to pneumococcal infections is impaired in older people, and current vaccines are poorly protective against pneumococcal disease in this population. Naturally acquired immunity to pneumococcal capsular polysaccharides develops during childhood and is robust in young adults but deteriorates with advanced age. In particular, antibody levels and function are reduced in older people. Pneumococcal vaccines are recommended for people >65 years old. However, the benefits of polysaccharide and protein-conjugated vaccines in this population are small, because of both serotype replacement and incomplete protection against vaccine serotype pneumococcal disease...
June 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28404574/parasitic-infections-in-pregnancy-decrease-placental-transfer-of-antipneumococcus-antibodies
#16
Noah D McKittrick, David M Vu, Indu Malhotra, Charles H King, Francis Mutuku, A Desiree LaBeaud
Many factors can influence maternal placental antibody transfer to the fetus, which confers important immune protection to the newborn infant. However, little is known about the effect of maternal parasitic infection on placental antibody transfer. To investigate this, we selected from a parent study of 576 pregnant Kenyan women four groups of women with term deliveries (≥37 weeks), including uninfected women (n = 30) and women with solo infections with malaria (n = 30), hookworm (n = 30), or schistosomiasis (n = 10)...
June 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28404573/cytomegalovirus-virions-shed-in-urine-have-a-reversible-block-to-epithelial-cell-entry-and-are-highly-resistant-to-antibody-neutralization
#17
Xiaohong Cui, Stuart P Adler, Mark R Schleiss, Ravit Arav-Boger, Gail J Demmler Harrison, Michael A McVoy
Cytomegalovirus (CMV) causes sensorineural hearing loss and developmental disabilities in newborns when infections are acquired in utero Pregnant women may acquire CMV from oral exposure to CMV in urine or saliva from young children. Neutralizing antibodies in maternal saliva have the potential to prevent maternal infection and, in turn, fetal infection. As CMV uses different viral glycoprotein complexes to enter different cell types, the first cells to be infected in the oral cavity could determine the type of antibodies needed to disrupt oral transmission...
June 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28404572/an-hiv-envelope-gp120-fc-fusion-protein-elicits-effector-antibody-responses-in-rhesus-macaques
#18
Zhanna Shubin, Weizhong Li, Bhawna Poonia, Guido Ferrari, Celia LaBranche, David Montefiori, Xiaoping Zhu, C David Pauza
A goal for HIV prevention programs is to develop safe, effective vaccines that elicit durable and broadly protective antibodies. Many vaccine programs focus on the immune responses to critical epitopes in the gp120 portion of HIV envelope glycoprotein (Env) and seek to improve the quality and quantity of antibodies by altering the sequence, conformation, oligomerization, or glycosylation of gp120 to activate appropriate germ line B cells and mimic the subsequent maturation pathways seen in infected individuals...
June 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28404571/early-detection-of-circulating-antigen-and-igm-associated-immune-complexes-during-experimental-mycobacterium-bovis-infection-in-cattle
#19
Konstantin P Lyashchenko, Rena Greenwald, Alina Sikar-Gang, Archana A Sridhara, Ashley Johnathan, Paul Lambotte, Javan Esfandiari, Mayara F Maggioli, Tyler C Thacker, Mitchell V Palmer, W Ray Waters
The presence of circulating antigen in cattle experimentally infected with Mycobacterium bovis was demonstrated using dual-path platform (DPP) technology. The antigen capture immunoassays employed rabbit polyclonal antibody recognizing predominantly M. tuberculosis complex-specific epitopes and were able to detect soluble substances and whole cells of mycobacteria. The antigen found in serum appeared to be mostly bound to IgM, but not to IgG, within the immune complexes formed at early stages of M. bovis infection...
June 2017: Clinical and Vaccine Immunology: CVI
https://www.readbyqxmd.com/read/28381403/decreased-vector-gene-expression-from-e2b-gene-deleted-adenovirus-serotype-5-vaccines-intensifies-proinflammatory-immune-responses
#20
Dionisia Quiroga, Yasser A Aldhamen, Sarah Godbehere, Laura Harding, Andrea Amalfitano
Recombinant adenovirus serotype 5 (Ad5) vectors are promising vaccine candidates due to their intrinsic immunogenicity and potent transgene expression; however, widespread preexisting Ad5 immunity has been considered a developmental impediment to the use of traditional, or conventional, E1 and E3 gene-deleted Ad5 (Ad5[E1-]) vaccines. Even in the presence of anti-Ad5 immunity, recent murine and human studies have confirmed E2b gene-deleted Ad5 (Ad5[E1-,E2b-]) vaccines to be highly efficacious inducers of transgene-specific memory responses and significantly less toxic options than Ad5[E1-] vaccines...
June 2017: Clinical and Vaccine Immunology: CVI
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