Moodley Y.,University of KwaZulu - Natal |
Naidoo P.,National Health Laboratory Services |
Biccard B.M.,University of KwaZulu - Natal
South African Medical Journal | Year: 2013
Background. Recent evidence suggests that application of the Revised Cardiac Risk Index (RCRI) for peri-operative cardiovascular risk stratification in vascular surgery patients may be inappropriate, necessitating the development of risk indices specific to vascular surgery patients. Objectives. To identify risk factors for cardiovascular morbidity and mortality in South African patients undergoing major vascular surgery, and to develop an appropriate cardiovascular risk stratification index, the South African Vascular Surgical Cardiac Risk Index (SAVS-CRI), which could be used to predict the risk of peri-operative major adverse cardiovascular events (MACEs) in South African vascular surgery patients. Methods. We prospectively collected data related to peri-operative MACE occurrence and established risk factors for peri-operative MACEs from adult patients who underwent elective vascular surgery at a tertiary hospital in Durban, South Africa, between February 2008 and March 2011. We determined independent predictors of peri-operative MACEs in our cohort by binary logistic regression and used the identified predictors to create a risk index that stratified patients into low-, intermediate- or high-risk groups. Results. Six independent predictors of peri-operative MACEs were identified in the vascular surgery cohort: age >65 years, a history of ischaemic heart disease, a history of diabetes, chronic β-blockade, prior coronary revascularisation, and the vascular surgical procedure. The risk model derived from these risk factors appeared to discriminate between the three risk groups more accurately than the RCRI. Conclusion. The RCRI is not appropriate for peri-operative cardiovascular risk stratification in vascular surgery patients. The SAVS-CRI may be preferable for risk stratification in South African vascular surgery patients, although independent validation is required.
Sherman G.G.,University of Witwatersrand |
Sherman G.G.,National Health Laboratory Services |
Lilian R.R.,Paediatric HIV Diagnostic Syndicate |
Coovadia A.H.,University of Witwatersrand
Pediatric Infectious Disease Journal | Year: 2012
BACKGROUND: Rapid tests have the potential to improve the identification of HIV-infected children in resource-limited settings. However, they remain underutilized because of a lack of data on their performance in the field using whole blood specimens. This study aimed to assess the accuracy of rapid tests for detecting HIV exposure, excluding HIV infection in HIV-exposed infants, and diagnosing HIV infection in children older than 18 months of age. METHODS: Five rapid tests (First Response, Pareekshak, Determine, Smart Check, and Insti) were performed using whole blood from children enrolled in a multisite, cross-sectional study in South Africa. HIV enzyme-linked immunosorbent assay and DNA polymerase chain reaction results defined HIV exposure and infection, respectively, and were the standards used for comparison. RESULTS: Of the 851 children enrolled, 186 (21.9%) were infected with HIV. For detecting HIV exposure, Determine demonstrated the highest sensitivity of 99.3% (95% confidence interval, 98.0-99.8) in early infancy, but sensitivity declined with age as seroreversion occurred. After 8 months of age, all tests except First Response excluded HIV infection in 82% to 100% of HIV-uninfected infants and, in conjunction with a clinical assessment, did not miss any HIV-infected children. Insti was the only test that detected all HIV-infected infants, albeit on the smallest number of samples. The performance of all rapid tests in children older than 18 months of age was similar to that in adults. CONCLUSIONS: Determine was the only rapid test that had a high enough sensitivity for detecting HIV exposure in early infancy, but it identified seroreversion later in life than the other tests. Insti warrants further investigation for both indications. Copyright © 2012 by Lippincott Williams & Wilkins.
Agency: Cordis | Branch: FP7 | Program: CP-FP | Phase: HEALTH.2010.2.3.3-3 | Award Amount: 3.85M | Year: 2010
Over the last years, large outbreaks of Crimean Congo Hemorrhagic fever virus (CCHFV) in several European countries and neighbouring areas are on the rise. This disease poses a great threat to public health due to its high mortality rate, modes of transmission and geographical distribution. Climate changes and observation of the CCHFV vector in central Europe alarm the European community as we cannot exclude that future outbreaks will take place in non-endemic area of Europe. To date, there is no vaccine available and no selective antiviral drug for the management of the disease. The general knowledge of migration, epidemiology, re-assortment and recombination of the virus is very limited. To fill these gaps, the CCH Fever project proposes to create a multidisciplinary collaborative research environment by bringing together selected competitive advantages such as: operative capacity with appropriate high security research facilities, reference centers and clinical samples from endemic areas and an international network of experienced researchers. This multidisciplinary research consortium will facilitate the progress in several key research areas of the field. This program will mainly focus on (i) developing sensitive and biosafe state-of-art diagnostic tools for CCHFV, (ii) gathering the forces and resources in Europe to build a Biobank of clinical samples, (iii) building a comprehensive database consisting in clinical, laboratory and surveillance data, (iv) taking advantage of unique and state-of art tools to progress towards vaccine candidates and specific antivirals against this bio-threat and (v) disseminating the appropriate knowledge to the health care workers in endemic regions and contributing to capacity building. These achievements will provide tools for local and European public health authorities to prevent or counter future outbreaks and monitor the spread of the disease thanks to the established novel and unique tools and resources.
Agency: Cordis | Branch: H2020 | Program: RIA | Phase: INFRAIA-1-2014-2015 | Award Amount: 11.98M | Year: 2015
The overall objective will be to create and mobilise an International network of high calibre centres around a strong European group of institutes selected for their appropriate expertises, to collect, amplify, characterise, standardise, authenticate, distribute and track, mammalian and other exotic viruses. The network of EVAg laboratories including 25 institutions represents an extensive range of virological disciplines. The architecture of the consortium is based on the association of capacities accessible to the partners but also to any end-users through the EVAg web-based catalogue. This concept has been elaborated and tested for its efficiency during the successful EVA project (FP7). The project will integrate more facilities dedicated to high risk pathogen (HRP) manipulation (1 in EVA, 13 in EVAg) The access to products derived from those HRP will be enhanced and for instance the production of diagnostic reagents will be facilitated. The new project will also provide access to high containment biosafety facilities to carry out in vivo studies of infectious disease using natural or models hosts, to look at prophylactic or therapeutic control measures and to develop materials for the evaluation of diagnostic tests, meaning an extensive capacity to service and to training. EVAg will also link up with other network-based virus-associated programmes that exist globally. However, looking further ahead, EVAg is conceived ultimately to be an open entity aiming at developing synergies and complementarity capabilities in such a way as to offer an improved access to researchers. This project will generate the largest collection of mammalian viruses in the world and move beyond the current state-of-the-art to provide an increasingly valuable resource and service to the worlds scientific community, including government health departments, higher education institutes, industry and, through information systems, the general public.
NANOSOLUTIONS - Biological Foundation for the Safety Classification of Engineered Nanomaterials (ENM): Systems Biology Approaches to Understand Interactions of ENM with Living Organisms and the Environment
Agency: Cordis | Branch: FP7 | Program: CP-IP | Phase: NMP.2012.1.3-1 | Award Amount: 13.77M | Year: 2013
The main objective of this research proposal is to identify and elaborate those characteristics of ENM that determine their biological hazard potential. This potential includes the ability of ENM to induce damage at the cellular, tissue, or organism levels by interacting with cellular structures leading to impairment of key cellular functions. These adverse effects may be mediated by ENM-induced alterations in gene expression and translation, but may involve also epigenetic transformation of genetic functions. We believe that it will be possible to create a set of biomarkers of ENM toxicity that are relevant in assessing and predicting the safety and toxicity of ENM across species. The ENM-organism interaction is complex and depends, not simply on the composition of ENM core, but particularly on its physico-chemical properties. In fact, important physico-chemical properties are largely governed by their surface properties. All of these factors determine the binding of different biomolecules on the surface of the ENM, the formation of a corona around the ENM core. Thus, any positive or negative biological effect of ENM in organisms may be dynamically modulated by the bio-molecule corona associated with or substituted into the ENM surface rather than the ENM on its own. The bio-molecule corona of seemingly identical ENM cores may undergo dynamic changes during their passage through different biological compartments; in other words, their biological effects are governed by this complex surface chemistry. We propose that understanding the fundamental characteristics of ENM underpinning their biological effects will provide a sound foundation with which to classify ENM according to their safety. Therefore, the overarching objective of this research is to provide a means to develop a safety classification of ENM based on an understanding of their interactions with living organisms at the molecular, cellular, and organism levels based on their material characteristics.