scholarly journals Detecting Antibody-Labeled BCG MNPs Using a Magnetoresistive Biosensor and Magnetic Labeling Technique

2015 ◽  
Vol 35 ◽  
pp. 92-103
Author(s):  
Teresa R.G. Barroso ◽  
Verónica C. Martins ◽  
Filipe Cardoso ◽  
Susana Cardoso ◽  
Jorge Pedrosa ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Point Of Care ◽  
Spin Valve ◽  
Health Concern ◽  
Fringe Field ◽  
Diagnostic Tools ◽  
High Morbidity ◽  
Magnetic Capture ◽  
And Control ◽  
Slow Growing

Tuberculosis is still a major global health concern, causing the estimated death of 1.5 million people per year and being associated with high morbidity. The development of point-of-care diagnostic tools for tuberculosis is mandatory, especially because the fast and accurate detection of the slow-growing Mycobacterium tuberculosis by the conventional diagnostic tests is difficult.The objective of this work was to develop the first steps to achieve a portable method for the diagnosis of tuberculosis, by a sandwich-immunoassay combined with magnetoresistive biochip technology.With the purpose of conjugating 250 nm streptavidin-coated magnetic nanoparticles with anti- M.tuberculosis biotinylated antibodies, Mycobacteriumbovis Bacillus Calmette-Guérin was used as a surrogate for M. tuberculosis bacteria. After magnetic capture, target bacteria were brought in contact with the surface of the magnetoresistive biochip previously functionalized with a secondary anti-M. tuberculosis antibody. Magnetically labeled cells were detected by an array of spin-valve sensors, which change their electrical resistance in the presence of the fringe field of the magnetic particles. Optimization studies on the efficiency of the magnetic capture and further recognition of the bacteria by the secondary antibody on the biochip surface were conducted. The results on the magnetoresistive biochip showed a clear difference in the signal between specific and control (non-specific) sensors, suggesting the usefulness of this technique as a potential biorecognition tool for the development of a point-of-care diagnostic method for tuberculosis.

scholarly journals Detecting Antibody-Labeled BCG MNPs Using a Magnetoresistive Biosensor and Magnetic Labeling Technique

2015 ◽  
Vol 34 ◽  
pp. 49-60 ◽  
Author(s):  
Teresa R.G. Barroso ◽  
Verónica C. Martins ◽  
Filipe Cardoso ◽  
Susana Cardoso ◽  
Jorge Pedrosa ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Point Of Care ◽  
Spin Valve ◽  
Health Concern ◽  
Fringe Field ◽  
Diagnostic Tools ◽  
High Morbidity ◽  
Magnetic Capture ◽  
And Control ◽  
Slow Growing

Tuberculosis is still a major global health concern, causing the estimated death of 1.5 million people per year and being associated with high morbidity. The development of point-of-care diagnostic tools for tuberculosis is mandatory, especially because the fast and accurate detection of the slow-growing Mycobacterium tuberculosis by the conventional diagnostic tests is difficult.The objective of this work was to develop the first steps to achieve a portable method for the diagnosis of tuberculosis, by a sandwich-immunoassay combined with magnetoresistive biochip technology.With the purpose of conjugating 250 nm streptavidin-coated magnetic nanoparticles with anti- M.tuberculosis biotinylated antibodies, Mycobacteriumbovis Bacillus Calmette-Guérin was used as a surrogate for M. tuberculosis bacteria. After magnetic capture, target bacteria were brought in contact with the surface of the magnetoresistive biochip previously functionalized with a secondary anti-M.tuberculosis antibody. Magnetically labeled cells were detected by an array of spin-valve sensors, which change their electrical resistance in the presence of the fringe field of the magnetic particles. Optimization studies on the efficiency of the magnetic capture and further recognition of the bacteria by the secondary antibody on the biochip surface were conducted. The results on the magnetoresistive biochip showed a clear difference in the signal between specific and control (non-specific) sensors, suggesting the usefulness of this technique as a potential biorecognition tool for the development of a point-of-care diagnostic method for tuberculosis.

scholarly journals Intracranial hydatid disease

2021 ◽  
pp. 85-93
Author(s):  
S.N. Gautam ◽  
Jigmisha Acharya ◽  
Banesh Jain ◽  
Piyush Kumar Panchariya
Keyword(s):  
Public Health ◽  
Hydatid Disease ◽  
Medical Management ◽  
Financial Burden ◽  
Surgical Excision ◽  
Health Concern ◽  
High Morbidity ◽  
Female Ratio ◽  
Pediatric Age Group ◽  
And Control

Background: Echinococcosis also known as hydatid disease is an endemic zoonotic disease with growing public health concern with an estimated financial burden of US Dollars 193,539,740 annually. Its definitive host being carnivores and man being an accidental intermediate host. The most common organ affected is the liver, the brain is involved in about 2% of cases. Intracranial hydatid carries high morbidity owing to pressure effect and a slow-growing hence the diagnosis is often delayed. Surgery is the mainstay of treatment, medical management being reserved for selected cases. Materials and method: A retrospective analysis of all the cases of intracranial hydatid disease managed at our department was done from 2013 to 2020 and data were analysed. Results: A total of 6 cases were found with an incidence of 1.33% of all intracranial space-occupying lesions during the study period with male to female ratio of 5:1, mean age at presentation 21.2 years, 4 out of 6 patient in the pediatric age group, cyst localised mainly in middle cerebral artery territory, mostly solitary but multiple in one case, all cases managed surgically with preoperative rupture in one case, recurrence noted in another one, Albendazole was given to cases only with rupture or recurrence. Conclusions:  Intracranial hydatid disease should be suspected in all non-enhancing cystic brain lesions especially in endemic regions and all patients should have preferably surgical excision using the “Dowling technique” with medical management reserved for inaccessible lesions, patients unfit for surgery, rupture and recurrent cases. Its high time when public health strategies should also be focussed on prevention and control of disease with appropriate measure at the community level.

scholarly journals Tools and Techniques for Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2)/COVID-19 Detection

2021 ◽  
Vol 34 (3) ◽  
Author(s):  
Seyed Hamid Safiabadi Tali ◽  
Jason J. LeBlanc ◽  
Zubi Sadiq ◽  
Oyejide Damilola Oyewunmi ◽  
Carolina Camargo ◽  
...  
Keyword(s):  
Large Scale ◽  
Imaging Techniques ◽  
Point Of Care ◽  
Lessons Learned ◽  
Disease Spread ◽  
Infection Prevention And Control ◽  
Diagnostic Tools ◽  
Specimen Collection ◽  
Recent Developments ◽  
And Control

SUMMARY The coronavirus disease 2019 (COVID-19) pandemic, caused by severe acute respiratory disease coronavirus 2 (SARS-CoV-2), has led to millions of confirmed cases and deaths worldwide. Efficient diagnostic tools are in high demand, as rapid and large-scale testing plays a pivotal role in patient management and decelerating disease spread. This paper reviews current technologies used to detect SARS-CoV-2 in clinical laboratories as well as advances made for molecular, antigen-based, and immunological point-of-care testing, including recent developments in sensor and biosensor devices. The importance of the timing and type of specimen collection is discussed, along with factors such as disease prevalence, setting, and methods. Details of the mechanisms of action of the various methodologies are presented, along with their application span and known performance characteristics. Diagnostic imaging techniques and biomarkers are also covered, with an emphasis on their use for assessing COVID-19 or monitoring disease severity or complications. While the SARS-CoV-2 literature is rapidly evolving, this review highlights topics of interest that have occurred during the pandemic and the lessons learned throughout. Exploring a broad armamentarium of techniques for detecting SARS-CoV-2 will ensure continued diagnostic support for clinicians, public health, and infection prevention and control for this pandemic and provide advice for future pandemic preparedness.

scholarly journals Nanobiosensors as new diagnostic tools for SARS, MERS and COVID-19: from past to perspectives

2020 ◽  
Vol 187 (12) ◽  
Author(s):  
Riccarda Antiochia
Keyword(s):  
State Of The Art ◽  
Point Of Care ◽  
Respiratory Illness ◽  
Diagnostic Tools ◽  
The Novel ◽  
Rt Pcr ◽  
Critical Comparison ◽  
Novel Coronavirus ◽  
And Control ◽  
Affinity Biosensors

AbstractThe severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS) and novel coronavirus 19 (COVID-19) epidemics represent the biggest global health threats in the last two decades. These infections manifest as bronchitis, pneumonia or severe, sometimes fatal, respiratory illness. The novel coronavirus seems to be associated with milder infections but it has spread globally more rapidly becoming a pandemic. This review summarises the state of the art of nanotechnology-based affinity biosensors for SARS, MERS and COVID-19 detection. The nanobiosensors are antibody- or DNA-based biosensors with electrochemical, optical or FET-based transduction. Various kinds of nanomaterials, such as metal nanoparticles, nanowires and graphene, have been merged to the affinity biosensors to enhance their analytical performances. The advantages of the use of the nanomaterials are highlighted, and the results compared with those obtained using non-nanostructured biosensors. A critical comparison with conventional methods, such as RT-PCR and ELISA, is also reported. It is hoped that this review will provide interesting information for the future development of new reliable nano-based platforms for point-of-care diagnostic devices for COVID-19 prevention and control.

scholarly journals Stopping the COVID-19 Pandemic: A Review on the Advances of Diagnosis, Treatment, and Control Measures

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Md. Hasanul Banna Siam ◽  
Nahida Hannan Nishat ◽  
Ahsan Ahmed ◽  
Mohammad Sorowar Hossain
Keyword(s):  
Viral Vector ◽  
Point Of Care ◽  
Protein Detection ◽  
Control Measures ◽  
Diagnostic Tools ◽  
Mesenchymal Stem Cell Therapy ◽  
Containment Measures ◽  
Rapid Tests ◽  
And Control ◽  
Second Wave

With the continued spread of COVID-19 across the world, rapid diagnostic tools, readily available respurposable drugs, and prompt containment measures to control the SARS-CoV-2 infection are of paramount importance. Examples of recent advances in diagnostic tests are CRISPR technology, IgG assay, spike protein detection, and use of artificial intelligence. The gold standard reverse transcription polymerase chain (RT-PCR) has also been upgraded with point-of-care rapid tests. Supportive treatment, mechanical ventilation, and extracorporeal membrane oxygenation (ECMO) remain the primary choice, while therapeutic options include antivirals, antiparasitics, anti-inflammatories, interferon, convalescent plasma, monoclonal antibody, hyperimmunoglobulin, RNAi, and mesenchymal stem cell therapy. Different types of vaccines such as RNA, DNA, and lentiviral, inactivated, and viral vector are in clinical trials. Moreover, rapidly deployable and easy-to-transport innovative vaccine delivery systems are also in development. As countries have started easing down on the lockdown measures, the chance for a second wave of infection demands strict and rational control policies to keep fatalities minimized. An improved understanding of the advances in diagnostic tools, treatments, vaccines, and control measures for COVID-19 can provide references for further research and aid better containment strategies.

Clinico-bacteriological Profile and Outcome of Empyema Thoracis in Children at a Tertiary Care Hospital of Central Nepal

2020 ◽  
Vol 16 (3) ◽  
Author(s):  
Atanu Pan ◽  
Debarshi Jana
Keyword(s):  
Ct Scan ◽  
Broad Spectrum ◽  
Chest Tube ◽  
Chest Tube Drainage ◽  
Diagnostic Tools ◽  
High Morbidity ◽  
Care Hospital ◽  
Empyema Thoracis ◽  
First Line ◽  
Tube Drainage

Background: Empyema thoracis (ET) is a serious infection of the pleural space. Despite the availability of broad spectrum antibacterial, improved vaccination coverage and better diagnostic tools, Empyema Thoracis remains associated with high morbidity worldwide. Delay   in   early   diagnosis,   failure   to institute   appropriate   antimicrobial   therapy,   multidrug resistant   organisms,   malnutrition,   comorbidities,   poor health  seeking  behaviour  and  high treatment  cost  burden contribute  to  increased  morbidity  in  children. The available  treatment  options  include  intravenous broad-spectrum antibiotics  either  alone  or  in  combination  with surgical  procedure  (thoracocentesis,  chest  tube  drainage, fibrinolytic  therapy,  decortications  with  video  assistedthoracoscopic surgery (VATS) and open drainage. Methods: Fifty Children between 1 month to 16 years admitted in the Pediatrics Ward, PICU of College of Medical Sciences, Bharatpur,Nepal. Data analysis was done by SPSS 24.0. Results: Present study found that according to blood culture, 3(6.0%) patients had enterococcus, 40(80.0%) patients had no growth, 2(4.0%) patients had pseudomonas, 4(8.0%) patients had staphylococcus and 1(2.0%) patients had streptococcus. We found that 20(40.0%) patients had done CT scan thorax, 30(60.0%) patients had not done CT scan thorax and 32(64.0%) patients had Amoxiclav first line antibiotic and 18(36.0%) patients had Ceftriaxone first line antibiotic. Conclusions: Suitable antibiotics and prompt chest tube drainage is an effective method of treatment of childhood empyema, especially in resource-poor settings. Majority of the patients progress on this conservative management and have good recovery on follow up.  

scholarly journals A Legionnaires’ Disease Cluster in a Private Building in Italy

2021 ◽  
Vol 18 (13) ◽  
pp. 6922
Author(s):  
Maria Luisa Ricci ◽  
Maria Cristina Rota ◽  
Maria Grazia Caporali ◽  
Antonietta Girolamo ◽  
Maria Scaturro
Keyword(s):  
Severe Pneumonia ◽  
Control Measures ◽  
Health Concern ◽  
Human Consumption ◽  
Domestic Water ◽  
Quality Of Water ◽  
Legionnaires Disease ◽  
Prevention And Control Measures ◽  
Private Homes ◽  
And Control

Legionnaires’ disease (LD) is a severe pneumonia caused by bacteria belonging to the genus Legionella. This is a major public health concern and infections are steadily increasing worldwide. Several sources of infection have been identified, but they have not always been linked to human isolates by molecular match. The well-known Legionella contamination of private homes has rarely been associated with the acquisition of the disease, although some patients never left their homes during the incubation period. This study demonstrated by genomic matching between clinical and environmental Legionella isolates that the source of an LD cluster was a private building. Monoclonal antibodies and sequence-based typing were used to type the isolates, and the results clearly demonstrated the molecular relationship between the strains highlighting the risk of contracting LD at home. To contain this risk, the new European directive on the quality of water intended for human consumption has introduced for the first time Legionella as a microbiological parameter to be investigated in domestic water systems. This should lead to a greater attention to prevention and control measures for domestic Legionella contamination and, consequently, to a possible reduction in community acquired LD cases.

scholarly journals Agro-Environmental Determinants of Leptospirosis: A Retrospective Spatiotemporal Analysis (2004−2014) in Mahasarakham Province (Thailand)

2021 ◽  
Vol 6 (3) ◽  
pp. 115
Author(s):  
Jaruwan Viroj ◽  
Julien Claude ◽  
Claire Lajaunie ◽  
Julien Cappelle ◽  
Anamika Kritiyakan ◽  
...  
Keyword(s):  
Public Health ◽  
Animal Health ◽  
Spatiotemporal Analysis ◽  
Health Concern ◽  
Intersectoral Collaboration ◽  
The Public ◽  
Additive Modeling ◽  
The One ◽  
And Control ◽  
Northeastern Thailand

Leptospirosis has been recognized as a major public health concern in Thailand following dramatic outbreaks. We analyzed human leptospirosis incidence between 2004 and 2014 in Mahasarakham province, Northeastern Thailand, in order to identify the agronomical and environmental factors likely to explain incidence at the level of 133 sub-districts and 1,982 villages of the province. We performed general additive modeling (GAM) in order to take the spatial-temporal epidemiological dynamics into account. The results of GAM analyses showed that the average slope, population size, pig density, cow density and flood cover were significantly associated with leptospirosis occurrence in a district. Our results stress the importance of livestock favoring leptospirosis transmission to humans and suggest that prevention and control of leptospirosis need strong intersectoral collaboration between the public health, the livestock department and local communities. More specifically, such collaboration should integrate leptospirosis surveillance in both public and animal health for a better control of diseases in livestock while promoting public health prevention as encouraged by the One Health approach.

scholarly journals Resources, Problems and Challenges of Autism Spectrum Disorder Diagnosis and Support System in Poland

2021 ◽  
Author(s):  
Anna Lenart ◽  
Jacek Pasternak
Keyword(s):  
Autism Spectrum Disorder ◽  
Support System ◽  
Autism Spectrum ◽  
Diagnostic Tools ◽  
Diagnostic Process ◽  
Autism Diagnosis ◽  
Autism Spectrum Disorder Diagnosis ◽  
Effective System ◽  
Diagnostic Standards ◽  
And Control

AbstractThe article refers to resources, problems and challenges of autism diagnosis and support system in Poland. The resources include: the increasing number of specialists, diagnostic and therapeutic centres, well-established course of education for people working with youths, standardised and normalised diagnostic tools. The diagnostic process is not without some areas in need of our focus: the tendency of some specialists to make unauthorised diagnosis, overshadowing; underestimation of comorbidity of ASD with other disorders. The challenges refer to introducing an effective system of monitoring the services provided in form of certification and control in order to prevent their abuse, initiating category of temporary diagnosis; paying more attention on individual’s resources, better cooperation among specialists, teachers and families, developing and unifying diagnostic standards.

scholarly journals Comparative Analysis of the Euroimmun CXCL13 Enzyme-Linked Immunosorbent Assay and the ReaScan Lateral Flow Immunoassay for Diagnosis of Lyme Neuroborreliosis

2020 ◽  
Vol 58 (9) ◽  
Author(s):  
Katharina Ziegler ◽  
Anca Rath ◽  
Christoph Schoerner ◽  
Renate Meyer ◽  
Thomas Bertsch ◽  
...  
Keyword(s):  
Immunosorbent Assay ◽  
Roc Curve ◽  
Point Of Care ◽  
Lateral Flow ◽  
Lyme Neuroborreliosis ◽  
Diagnostic Tools ◽  
Lateral Flow Immunoassay ◽  
Enzyme Linked Immunosorbent Assay ◽  
European Federation ◽  
Point Of Care Test

ABSTRACT Diagnosis of Lyme neuroborreliosis (LNB) is challenging, as long as Borrelia-specific intrathecal antibodies are not yet detectable. The chemokine CXCL13 is elevated in the cerebrospinal fluid (CSF) of LNB patients. Here, we compared the performances of the Euroimmun CXCL13 enzyme-linked immunosorbent assay (CXCL13 ELISA) and the ReaScan CXCL13 lateral flow immunoassay (CXCL13 LFA), a rapid point-of-care test, to support the diagnosis of LNB. In a dual-center case-control study, CSF samples from 90 patients (34 with definite LNB, 10 with possible LNB, and 46 with other central nervous system [CNS] diseases [non-LNB group]) were analyzed with the CXCL13 ELISA and the CXCL13 LFA. Classification of patients followed the European Federation of Neurological Societies (EFNS) guidelines on LNB. The CXCL13 ELISA detected elevated CXCL13 levels in all patients with definite LNB (median, 1,409 pg/ml) compared to the non-LNB controls (median, 20.7 pg/ml; P < 0.0001), with a sensitivity of 100% and a specificity of 84.8% (cutoff value, 78.6 pg/ml; area under the receiver operating characteristic [ROC] curve, 0.93). Similarly, the CXCL13 LFA yielded elevated CXCL13 levels in 31 patients with definite LNB (median arbitrary value, 223.5) compared to the non-LNB control patients (median arbitrary value, 0; P < 0.0001) and had a sensitivity and specificity of 91.2% and 93.5%, respectively (cutoff arbitrary value, 22.5; area under the ROC curve, 0.94). The correlation between the CXCL13 levels obtained by ELISA and LFA was strong (Spearman correlation coefficient r = 0.89; P < 0.0001). The CXCL13 ELISA and the CXCL13 LFA are comparable diagnostic tools for the detection of CXCL13 in the CSF of patients with definite LNB. The advantage of the CXCL13 LFA is the shorter time to result.

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