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Infectious diseases modeling

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https://www.readbyqxmd.com/read/28644862/high-intensity-corneal-collagen-crosslinking-with-riboflavin-and-uva-in-rat-cornea
#1
Yirui Zhu, Peter S Reinach, Hanlei Zhu, Qiufan Tan, Qinxiang Zheng, Jia Qu, Wei Chen
Corneal collagen cross-linking (CXL) halts human corneal ectasias progression by increasing stromal mechanical stiffness. Although some reports describe that this procedure is effective in dealing with some infectious and immunologic corneal thinning diseases, there is a need for more animal models whose corneal thickness more closely resemble those occurring in these patients. To meet this need, we describe here high-intensity protocols that are safe and effective for obtaining CXL in rat corneas. Initially, a range of potentially effective UVA doses were evaluated based on their effectiveness in increasing tissue enzymatic resistance to dissolution...
2017: PloS One
https://www.readbyqxmd.com/read/28642749/rna-seq-reveals-enhanced-sugar-metabolism-in-streptococcus-mutans-co-cultured-with-candida-albicans-within-mixed-species-biofilms
#2
Jinzhi He, Dongyeop Kim, Xuedong Zhou, Sang-Joon Ahn, Robert A Burne, Vincent P Richards, Hyun Koo
Early childhood caries (ECC), which can lead to rampant tooth-decay that is painful and costly to treat, is one of the most prevalent infectious diseases affecting children worldwide. Previous studies support that interactions between Streptococcus mutans and Candida albicans are associated with the pathogenesis of ECC. The presence of Candida enhances S. mutans growth, fitness and accumulation within biofilms in vitro, although the molecular basis for these behaviors is undefined. Using an established co-cultivation biofilm model and RNA-Seq, we investigated how C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28639244/veterinary-public-health-in-italy-from-healthy-animals-to-healthy-food-contribution-to-improve-economy-in-developing-countries
#3
Margherita Cacaci, Rossella Colomba Lelli
The role of the veterinarian as a public health officer is intrinsic to the history and the culture of veterinary organization in Italy. The Veterinary service being part of the Health administration since the birth of the Italian State in the XIX Century. In the second half of the last century the birth of the Italian National Health Service confirmed that the function of the Italian veterinary service was to analyze and reduce the risks for the human population connected to the relationship man-animal-environment, animal health, food safety and security...
June 22, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28638420/treatment-delay-and-total-delay-among-pulmonary-tuberculosis-patients-in-the-north-of-iran-application-survival-data-analysis
#4
Jamshid Yazdani-Charati, Mohammad Sadegh Rezai, Afsane Fendereski, Soraya Mohammadi, Nadia Alipour
BACKGROUND: Tuberculosis (TB) remains the leading cause of death among infectious diseases worldwide. Identifying the factors associated with the treatment delay and total delay would be helpful in the prevention of tuberculosis and in reducing the burden on the health care system. The objective of this study was to assess the treatment delay and total delay in TB patients and investigate the factors causing these delays. MATERIALS AND METHODS: This was a longitudinal study conducted in 2009-2015...
2017: Tanaffos
https://www.readbyqxmd.com/read/28638106/protective-efficacy-of-the-trivalent-pseudomonas-aeruginosa-vaccine-candidate-pcrv-opri-hcp1-in-murine-pneumonia-and-burn-models
#5
Feng Yang, Jiang Gu, Liuyang Yang, Chen Gao, Haiming Jing, Ying Wang, Hao Zeng, Quanming Zou, Fenglin Lv, Jinyong Zhang
Pseudomonas aeruginosa is a formidable pathogen that is responsible for a diverse spectrum of human infectious diseases, resulting in considerable annual mortality rates. Because of biofilm formation and its ability of rapidly acquires of resistance to many antibiotics, P. aeruginosa related infections are difficult to treat, and therefore, developing an effective vaccine is the most promising method for combating infection. In the present study, we designed a novel trivalent vaccine, PcrV28-294-OprI25-83-Hcp11-162 (POH), and evaluated its protective efficacy in murine pneumonia and burn models...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28638046/a-note-on-the-stationary-distribution-of-stochastic-seir-epidemic-model-with-saturated-incidence-rate
#6
Qixing Han, Liang Chen, Daqing Jiang
The stochastic SEIR infectious diseases model with saturated incidence rate is studied in this paper. By constructing appropriate Lyapunov functions, we show that there is a stationary distribution for the system and the ergodicity holds provided [Formula: see text] > 1. In particular, we improve the results obtained by previous studies greatly, condition in our Theorem is more concise and elegant.
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28637763/analysis-of-hsv-reactivation-in-explant-reveals-a-method-dependent-difference-in-measured-timing-of-reactivation
#7
Jessica R Doll, Nancy M Sawtell
Herpes simplex virus (HSV) infection is widespread in the human population. Following orofacial infection, HSV establishes latency in innervating sensory neurons, primarily located in the trigeminal ganglia. A central feature of HSV pathogenesis is the ability to periodically reactivate in those neurons and transport back to the body surface. Both transmission and disease; such as keratitis, encephalitis, and neurodegeneration, have been linked to reactivation. Despite invaluable insights obtained from model systems, interactions between viral and host functions that regulate reactivation are still incompletely understood...
June 21, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28636650/the-formation-of-lipid-droplets-favors-intracellular-mycobacterium-leprae-survival-in-sw-10-non-myelinating-schwann-cells
#8
Song-Hyo Jin, Sung-Kwan An, Seong-Beom Lee
Leprosy is a chronic infectious disease that is caused by the obligate intracellular pathogen Mycobacterium leprae (M.leprae), which is the leading cause of all non-traumatic peripheral neuropathies worldwide. Although both myelinating and non-myelinating Schwann cells are infected by M.leprae in patients with lepromatous leprosy, M.leprae preferentially invades the non-myelinating Schwann cells. However, the effect of M.leprae infection on non-myelinating Schwann cells has not been elucidated. Lipid droplets (LDs) are found in M...
June 21, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28636448/ebola-virus-training-a-needs-assessment-and-gap-analysis
#9
Kevin Yeskey, Joseph Hughes, Betsy Galluzzo, Nina Jaitly, James Remington, Deborah Weinstock, Joy Lee Pearson, Jonathan D Rosen
In response to the 2014 Ebola virus disease outbreak, the Worker Training Program embarked on an assessment of existing training for those at risk for exposure to the virus. Searches of the recent peer-reviewed literature were conducted for descriptions of relevant training. Federal guidance issued during 2015 was also reviewed. Four stakeholder meetings were conducted with representatives from health care, academia, private industry, and public health to discuss issues associated with ongoing training. Our results revealed few articles about training that provided sufficient detail to serve as models...
May 2017: Health Security
https://www.readbyqxmd.com/read/28636444/a-highly-infectious-disease-care-network-in-the-us-healthcare-system
#10
Aurora B Le, Paul D Biddinger, Philip W Smith, Jocelyn J Herstein, Deborah A Levy, Shawn G Gibbs, John J Lowe
During the 2014-15 Ebola outbreak in West Africa, the United States responded by stratifying hospitals into 1 of 3 Centers for Disease Control and Prevention (CDC)-designated categories-based on the hospital's ability to identify, isolate, assess, and provide care to patients with suspected or confirmed Ebola virus disease (EVD)-in an attempt to position the US healthcare system to safely isolate and care for potential patients. Now, with the Ebola epidemic quelled, it is crucial that we act on the lessons learned from the EVD response to broaden our national perspective on infectious disease mitigation and management, build on our newly enhanced healthcare capabilities to respond to infectious disease threats, develop a more cost-effective and sustainable model of infectious disease prevention, and continue to foster training so that the nation is not in a vulnerable position once more...
May 2017: Health Security
https://www.readbyqxmd.com/read/28631108/reproduction-number-and-asymptotic-stability-for-the-dynamics-of-a-honey-bee-colony-with-continuous-age-structure
#11
M I Betti, L M Wahl, M Zamir
A system of partial differential equations is derived as a model for the dynamics of a honey bee colony with a continuous age distribution, and the system is then extended to include the effects of a simplified infectious disease. In the disease-free case, we analytically derive the equilibrium age distribution within the colony and propose a novel approach for determining the global asymptotic stability of a reduced model. Furthermore, we present a method for determining the basic reproduction number [Formula: see text] of the infection; the method can be applied to other age-structured disease models with interacting susceptible classes...
June 19, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28630384/modulation-of-cd4-t-cell-subsets-by-euphorbia-microciadia-and-euphorbia-osyridea-plant-extracts
#12
Haideh Namdari, Maryam Izad, Zahra Amirghofran
BACKGROUND: Euphorbia plants are traditionally used in folk medicine for infections, inflammation, and cancer. OBJECTIVES: To investigate the effects of the butanolic extracts of Euphorbia micorociadia and Euphorbia osyridea on specific transcription factors and cytokines expression of T cell subsets. METHODS: Activated mouse splenocytes were cultured in the presence of non-cytotoxic concentrations of the extracts. Cells were evaluated for the gene expressions of T cell transcription factors and cytokines of T helper (Th)1 [T-bet and interferon gamma (IFNγ)], Th17 [retinoic acid receptor related orphan receptor (RORγt) and interleukin (IL)-17], and T regulatory (Treg) cells [forkhead box P3(Foxp3), IL-10, and Transforming growth factor (TGF)-β] using real-time PCR...
June 2017: Iranian Journal of Immunology: IJI
https://www.readbyqxmd.com/read/28629818/corydalis-hendersonii-hemsl-protects-against-myocardial-injury-by-attenuating-inflammation-and-fibrosis-via-nf-%C3%AE%C2%BAb-and-jak2-stat3-signaling-pathways
#13
Ruifeng Bai, Xu Yin, Xiao Feng, Yuan Cao, Yan Wu, Zhixiang Zhu, Chun Li, Pengfei Tu, Xingyun Chai
ETHNOPHARMACOLOGICAL RELEVANCE: Corydalis hendersonii Hemsl. (CH) with heat clearing and detoxifying effects are well described in Tibetan folk medicine. It has been used for centuries in China largely for the treatment of high altitude polycythemia, a pathophysiological condition referred to "plethora" in Tibetan medicine, hypertension, hepatitis, edema, gastritis, and other infectious diseases. AIM OF THE STUDY: To investigate the cardioprotective effects of Corydalis hendersonii extract in an ICR mouse model of myocardial ischemic injury...
June 16, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28628665/a-chromosome-5q31-1-locus-associates-with-tuberculin-skin-test-reactivity-in-hiv-positive-individuals-from-tuberculosis-hyper-endemic-regions-in-east-africa
#14
Rafal S Sobota, Catherine M Stein, Nuri Kodaman, Isaac Maro, Wendy Wieland-Alter, Robert P Igo, Albert Magohe, LaShaunda L Malone, Keith Chervenak, Noemi B Hall, Mecky Matee, Harriet Mayanja-Kizza, Moses Joloba, Jason H Moore, William K Scott, Timothy Lahey, W Henry Boom, C Fordham von Reyn, Scott M Williams, Giorgio Sirugo
One in three people has been infected with Mycobacterium tuberculosis (MTB), and the risk for MTB infection in HIV-infected individuals is even higher. We hypothesized that HIV-positive individuals living in tuberculosis-endemic regions who do not get infected by Mycobacterium tuberculosis are genetically resistant. Using an "experiment of nature" design that proved successful in our previous work, we performed a genome-wide association study of tuberculin skin test positivity using 469 HIV-positive patients from prospective study cohorts of tuberculosis from Tanzania and Uganda to identify genetic loci associated with MTB infection in the context of HIV-infection...
June 19, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28625783/probabilistic-invasion-underlies-natural-gut-microbiome-stability
#15
Benjamin Obadia, Z T Güvener, Vivian Zhang, Javier A Ceja-Navarro, Eoin L Brodie, William W Ja, William B Ludington
Species compositions of gut microbiomes impact host health [1-3], but the processes determining these compositions are largely unknown. An unexplained observation is that gut species composition varies widely between individuals but is largely stable over time within individuals [4, 5]. Stochastic factors during establishment may drive these alternative stable states (colonized versus non-colonized) [6, 7], which can influence susceptibility to pathogens, such as Clostridium difficile. Here we sought to quantify and model the dose response, dynamics, and stability of bacterial colonization in the fruit fly (Drosophila melanogaster) gut...
June 9, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28625193/place-based-social-contact-and-mixing-a-typology-of-generic-meeting-places-of-relevance-for-infectious-disease-transmission
#16
M Strömgren, E Holm, Ö Dahlström, J Ekberg, H Eriksson, A Spreco, T Timpka
This study aims to develop a typology of generic meeting places based on social contact and mixing of relevance for infectious disease transmission. Data were collected by means of a contact diary survey conducted on a representative sample of the Swedish population. The typology is derived from a cluster analysis accounting for four dimensions associated with transmission risk: visit propensity and its characteristics in terms of duration, number of other persons present and likelihood of physical contact...
June 19, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28624377/evaluation-of-a-biomimetic-3d-substrate-based-on-the-human-elastin-like-polypeptides-helps-model-system-for-elastolytic-activity-detection
#17
Lucia Corich, Marina Busetti, Vincenzo Petix, Sabina Passamonti, Antonella Bandiera
Elastin is a fibrous protein that confers elasticity to tissues such as skin, arteries and lung. It is extensively cross-linked, highly hydrophobic and insoluble. Nevertheless, elastin can be hydrolysed by bacterial proteases in infectious diseases, resulting in more or less severe tissue damage. Thus, development of substrates able to reliably and specifically detect pathogen-secreted elastolytic activity is needed to improve the in vitro evaluation of the injury that bacterial proteases may provoke. In this work, two human biomimetic elastin polypeptides, HELP and HELP1, as well as the matrices derived from HELP, have been probed as substrates for elastolytic activity detection...
June 14, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28623181/allele-level-hla-matching-for-umbilical-cord-blood-transplantation-for-non-malignant-diseases-in-children-a-retrospective-analysis
#18
Mary Eapen, Tao Wang, Paul A Veys, Jaap J Boelens, Andrew St Martin, Stephen Spellman, Carmem Sales Bonfim, Colleen Brady, Andrew J Cant, Jean-Hugues Dalle, Stella M Davies, John Freeman, Katherine C Hsu, Katharina Fleischhauer, Chantal Kenzey, Joanne Kurtzberg, Gerard Michel, Paul J Orchard, Annalisa Paviglianiti, Vanderson Rocha, Michael R Veneris, Fernanda Volt, Robert Wynn, Stephanie J Lee, Mary M Horowitz, Eliane Gluckman, Annalisa Ruggeri
BACKGROUND: The standard for selecting unrelated umbilical cord blood units for transplantation for non-malignant diseases relies on antigen-level (lower resolution) HLA typing for HLA-A and HLA-B, and allele-level for HLA-DRB1. We aimed to study the effects of allele-level matching at a higher resolution-HLA-A, HLA-B, HLA-C, and HLA-DRB1, which is the standard used for adult unrelated volunteer donor transplantation for non-malignant diseases-for umbilical cord blood transplantation...
June 13, 2017: Lancet Haematology
https://www.readbyqxmd.com/read/28622932/an-evolutionary-medicine-perspective-on-neandertal-extinction
#19
Alexis P Sullivan, Marc de Manuel, Tomas Marques-Bonet, George H Perry
The Eurasian sympatry of Neandertals and anatomically modern humans - beginning at least 45,000 years ago and possibly lasting for more than 5000 years - has sparked immense anthropological interest into the factors that potentially contributed to Neandertal extinction. Among many different hypotheses, the "differential pathogen resistance" extinction model posits that Neandertals were disproportionately affected by exposure to novel infectious diseases that were transmitted during the period of spatiotemporal sympatry with modern humans...
July 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28622854/linear-dna-vaccine-prepared-by-large-scale-pcr-provides-protective-immunity-against-h1n1-influenza-virus-infection-in-mice
#20
Fei Wang, Quanjiao Chen, Shuntang Li, Chenyao Zhang, Shanshan Li, Min Liu, Kun Mei, Chunhua Li, Lixin Ma, Xiaolan Yu
Linear DNA vaccines provide effective vaccination. However, their application is limited by high cost and small scale of the conventional polymerase chain reaction (PCR) generally used to obtain sufficient amounts of DNA effective against epidemic diseases. In this study, a two-step, large-scale PCR was established using a low-cost DNA polymerase, RKOD, expressed in Pichia pastoris. Two linear DNA vaccines encoding influenza H1N1 hemagglutinin (HA) 1, LEC-HA, and PTO-LEC-HA (with phosphorothioate-modified primers), were produced by the two-step PCR...
June 2017: Veterinary Microbiology
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