scholarly journals Elevated Plasma Matrix Metalloproteinase-8 associates with Sputum Culture Positivity in Pulmonary Tuberculosis

2021 ◽  
Author(s):  
Naomi F Walker ◽  
Farina Karim ◽  
Mahomed-Yunus S Moosa ◽  
Sashen Moodley ◽  
Matilda Mazibuko ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Matrix Metalloproteinase ◽  
Treatment Monitoring ◽  
Elevated Plasma ◽  
Tb Treatment ◽  
Culture Positivity ◽  
Potential Biomarker ◽  
Culture Positive ◽  
Culture Negative ◽  
Procollagen Iii

Current methods for tuberculosis (TB) treatment monitoring are suboptimal. We evaluated plasma matrix metalloproteinase (MMP) and procollagen III N-terminal propeptide concentrations before and during TB treatment as biomarkers. Plasma MMP-1, -8 and -10 significantly decreased during treatment. Plasma MMP-8 was increased in sputum Mycobacterium tuberculosis culture positive relative to culture negative participants, prior to (median 4609 pg/ml, IQR 2353-9048 vs 775 pg/ml, IQR 551-4920, p=0.019) and after 6 months (median 3650, IQR 1214-3888 vs 720, IQR 551-1321, p=0.008) of TB treatment. Consequently, plasma MMP-8 is a potential biomarker to enhance TB treatment monitoring and screen for possible culture positivity.

scholarly journals Association Between Diabetic Foot Infection Wound Culture Positivity and 1-Year Admission for Invasive Infection: A Multi-Center Cohort Study

2021 ◽  
Author(s):  
Westyn Branch-Elliman ◽  
Daniel Sturgeon ◽  
Adolf W Karchmer ◽  
Hillary J Mull
Keyword(s):  
Diabetic Foot ◽  
Systemic Infection ◽  
Causative Organism ◽  
Invasive Infection ◽  
Diabetic Foot Ulcers ◽  
Diabetic Foot Infections ◽  
Culture Positivity ◽  
Wound Culture ◽  
Culture Positive ◽  
Culture Negative

Abstract Inpatients with culture-positive diabetic foot infections are at elevated risk for subsequent invasive infection with the same causative organism. In outpatients with index diabetic foot ulcers, we found that wound culture positivity was independently associated with increased odds of 1-year admission for systemic infection when compared to culture-negative wounds.

scholarly journals Prediction of culture-positive sepsis and selection of empiric antibiotics in critically ill patients with complicated intra-abdominal infections: a retrospective study

2020 ◽  
Author(s):  
Joohyun Sim ◽  
Sung Soo Hong ◽  
Jae Young Kwak ◽  
Yun Tae Jung
Keyword(s):  
Sofa Score ◽  
Gastrointestinal Surgery ◽  
Mortality Rates ◽  
Intensive Care Unit Care ◽  
Gram Positive ◽  
Culture Positivity ◽  
Postoperative Intensive Care ◽  
Abdominal Infections ◽  
Culture Positive ◽  
Culture Negative

Abstract Purpose To compare the mortality rates between culture-positive and culture-negative sepsis in complicated intra-abdominal infections (cIAI) and investigate the predictors of culture-positivity and their causative microorganisms. Materials and methods The medical records of 1581 adult patients who underwent emergency gastrointestinal surgery between January 2013 and December 2018 were reviewed retrospectively. A total of 239 patients with sepsis or septic shock who were admitted to an emergency department, underwent emergency surgery for cIAI, and needed postoperative intensive care unit care were included and divided into two groups according to their initial blood and peritoneal culture results. Results Among the 239 patients, 200 were culture-negative and 39 were culture-positive. The culture-positive group had higher in-hospital (35.9% vs 14.5%; P = .001) and 30-day mortality (30.8% vs 12.0%; P = .003) than the culture-negative group. Colon involvement (OR 4.211; 95% CI 1.909–9.287; P < .001) and higher Sequential Organ Failure Assessment (SOFA) score (OR 1.169; 95% CI 1.065–1.282; P = .001) were shown to be the predictors of culture-positive sepsis for cIAI. Regarding antibiotic sensitivity, 31.6% of the gram-positive bacteria were methicillin-resistant and 42.1% of the gram-negative bacteria were extended spectrum β-lactamase-producing Enterobacteriaceae. Conclusions Patients with cIAI had higher mortality rates in culture-positive sepsis than in culture-negative sepsis. High SOFA score and colon involvement were the risk factors associated with culture-positivity. The most common single species grown in the blood or peritoneal cultures was Escherichia coli, and the most common group was Gram-positive cocci.

scholarly journals PCR Method for Detection of Adenovirus in Urine of Healthy and Human Immunodeficiency Virus-Infected Individuals

1998 ◽  
Vol 36 (11) ◽  
pp. 3323-3326 ◽  
Author(s):  
Marcela Echavarria ◽  
Michael Forman ◽  
John Ticehurst ◽  
J. Stephen Dumler ◽  
Patricia Charache
Keyword(s):  
Human Immunodeficiency Virus ◽  
Urine Samples ◽  
Culture Positivity ◽  
Immunodeficiency Virus ◽  
History Of ◽  
Pcr Method ◽  
Urine Processing ◽  
Culture Positive ◽  
Culture Negative

Adenoviruses (AdV) cause diseases that range from localized, self-limited illnesses to fatal infections in immunocompromised patients. Culture is assumed to be sensitive but requires viable virus and up to 3 weeks for detection, and it can be inhibited by bacterial contamination. A new PCR method amplifying a region of the hexon gene was developed in order to detect AdV in urine more rapidly and with greater sensitivity than obtainable by culture technology. All 18 serotypes tested were detected. Quantitatively, with optimized urine processing, AdV PCR detected 0.2 PFU/ml (serotype 11) and 10 DNA copies/ml (serotype 2). Serially collected urine samples from human immunodeficiency virus (HIV)-infected patients with concurrent cytomegalovirus retinitis were divided into three groups: AdV culture-positive samples, AdV culture-negative or bacterially contaminated samples from patients with a history of AdV culture-positive urines, and AdV culture-negative samples from patients without a history of AdV culture positivity. Urine samples from healthy adults were also tested by culture and PCR to screen for asymptomatic shedding. Amplification was assessed with and without prior DNA purification. AdV was detected by PCR in 90% of culture-positive urines (100% of unclotted samples, e.g., those culture positive after storage for PCR testing), 71% of culture-negative or bacterially contaminated urines from AdV-infected patients, and 28% from AdV culture-negative patients. Healthy volunteers were culture negative for AdV, and 96% were PCR negative. The new AdV PCR method is rapid and sensitive and can detect viral DNA in samples for which culturing is problematic. The role of AdV replication during HIV infection merits further investigation with sensitive tools such as PCR.

scholarly journals Enhanced serodiagnostic potential of a fusion molecule consisting of Rv1793, Rv2628 and a truncated Rv2608 of Mycobacterium tuberculosis

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0258389
Author(s):  
Sadaf Sulman ◽  
Saher Shahid ◽  
Aasia Khaliq ◽  
Atiqa Ambreen ◽  
Imran H. Khan ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Fusion Protein ◽  
Age Groups ◽  
Cost Effective ◽  
Antibody Responses ◽  
Pakistani Population ◽  
Fusion Construct ◽  
Culture Positivity ◽  
Increased Sensitivity ◽  
Culture Negative

Serodiagnosis of tuberculosis (TB) can be rapid, reliable and cost-effective if the issue of variable antibody responses of TB patients against different Mycobacterium tuberculosis (Mtb) antigens can be overcome by developing fusion proteins containing epitopes from multiple antigens of Mtb. In this study, Mtb antigens Rv1793, Rv2628, Rv2608 and a truncated variant produced by removing non-epitopic region from N-terminal of Rv2608 (tnRv2608), and the fusion protein Rv1793-Rv2628-tnRv2608 (TriFu64), were expressed in E. coli and purified. Plasma samples from TB patients characterized by sex, age and sputum/culture positivity, were used to compare the sensitivity of the single antigens with the fusion protein. Sensitivity of Rv1793, Rv2628 and Rv2608, was 27.8%, 39% and 36.3%, respectively. Truncation of Rv2608 increased sensitivity by approximately 35% in confirmed TB cases. Sensitivity of the fusion construct, TriFu64 increased to 66% with a specificity of 100%. Importantly, tnRv2608 was better able to detect sputum and culture negative patients, and this carried through to the fusion protein. We demonstrate that fusion of Mtb proteins ensures broad sensitivity across disease types, sex and age groups in a Pakistani population.

scholarly journals Expression of ppsD, a gene involved in synthesis of Mycobacterium tuberculosis virulence factor PDIM, reflects treatment response in pulmonary tuberculosis patients

2019 ◽  
Author(s):  
Kalpana Sriraman ◽  
Rupali Kekane ◽  
Daksha Shah ◽  
Dhananjaya Saranath ◽  
Nerges Mistry
Keyword(s):  
Drug Resistance ◽  
Mycobacterium Tuberculosis ◽  
Treatment Response ◽  
Target Genes ◽  
Drug Resistant ◽  
Tuberculosis Patients ◽  
Resistant Tuberculosis ◽  
End Of Treatment ◽  
Culture Positive ◽  
Culture Negative

AbstractDrug resistant tuberculosis (TB) cases are primarily driven by transmission, however, treatment failure and acquisition of drug resistance are still significant issues in drug sensitive TB cases. Study of gene expression in Mycobacterium tuberculosis (Mtb) isolated from poor outcome patients may offer clues towards prediction of treatment response. In the current study, expression of five non-drug target genes (ppsD, embC, Rv1457c, Rv1687c and recB) previously identified to be associated with drug resistance was studied in clinical isolates from patients with different treatment outcomes to examine its correlation to treatment response and acquisition of drug resistance in Mtb. Our results show that expression of ppsD, a gene involved in synthesis of cell wall lipid PDIM, was significantly increased in patients who developed drug resistance during treatment and patients who were drug resistant at diagnosis. On the other hand in longitudinal isolates collected during treatment, ppsD expression decreased consistently in patients who responded to treatment and became culture negative, while it increased in patients who did not respond to treatment as indicated by their culture positive status towards the end of treatment. These results demonstrate that ppsD expression reflects treatment response in TB patients and hence can be potentially used as a marker for predicting treatment response. Additional longitudinal studies with a larger cohort of patients are required to establish application of ppsD expression as a marker of treatment response.

Long Term Prognostic Utility of Matrix Metalloproteinase-9 in Patients with Acute Coronary Syndrome – A Systematic Review

2020 ◽  
Vol 21 ◽  
Author(s):  
Anamika Das ◽  
Melvin George ◽  
Durga Jha ◽  
Luxitaa Goenka
Keyword(s):  
Acute Coronary Syndrome ◽  
High Risk ◽  
Matrix Metalloproteinase ◽  
Developed Countries ◽  
Left Ventricular ◽  
Original Research ◽  
Coronary Syndrome ◽  
Potential Biomarker ◽  
Prognostic Utility

Background: Acute coronary syndrome (ACS) is the leading cause for morbidity and mortality in developed countries. Numerous groups have explored single and multiple biomarker strategies to identify diagnostic prognosticators of ACS which will improve our ability to identify high-risk individuals. Matrix metalloproteinase (MMP-9) is one potential biomarker which has been widely studied in ACS. Recent reports have showed the prognostic utility of MMP-9, but due to inconsistent results, it has not been possible to draw firm conclusions. Objective: This review aims to explore the ability of MMP-9 to predict long-term prognosis of ACS. To clarify this issue, we conducted a literature review to provide a comprehensive assessment of MMP-9 levels in ACS patients. Method: We retrieved a total of 1501 articles from PubMed and Google Scholar. After thorough scrutiny, 12 original research articles were found fulfilling the inclusion exclusion criteria. MMP-9’s ability as a biomarker of prognostication post ACS was reviewed. PRISMA guidelines were used for reporting. Result: The results revealed that MMP-9, apart from being an efficient diagnostic biomarker for ACS, helps in predicting the future risk of ACS with disease outcome. Positive correlation was found between plasma MMP-9 and left ventricular remodeling. A positive association was also found between cardiovascular death and higher MMP-9 levels. Conclusion: MMP-9 can be a potential prognostic marker for ACS and aid in identifying high risk patients for intensive management during follow -up.

scholarly journals Bacteremic sepsis leads to higher mortality when adjusting for confounders with propensity score matching

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lisa Mellhammar ◽  
Fredrik Kahn ◽  
Caroline Whitlow ◽  
Thomas Kander ◽  
Bertil Christensson ◽  
...  
Keyword(s):  
Intensive Care ◽  
Clinical Review ◽  
Pathogen Detection ◽  
Mortality Rates ◽  
Blood Cultures ◽  
Population Heterogeneity ◽  
Sepsis Diagnosis ◽  
Culture Positive ◽  
Culture Negative ◽  
Microbial Samples

AbstractOne can falsely assume that it is well known that bacteremia is associated with higher mortality in sepsis. Only a handful of studies specifically focus on the comparison of culture-negative and culture-positive sepsis with different conclusions depending on study design. The aim of this study was to describe outcome for critically ill patients with either culture-positive or -negative sepsis in a clinical review. We also aimed to identify subphenotypes of sepsis with culture status included as candidate clinical variables. Out of 784 patients treated in intensive care with a sepsis diagnosis, blood cultures were missing in 140 excluded patients and 95 excluded patients did not fulfill a sepsis diagnosis. Of 549 included patients, 295 (54%) had bacteremia, 90 (16%) were non-bacteremic but with relevant pathogens detected and in 164 (30%) no relevant pathogen was detected. After adjusting for confounders, 90-day mortality was higher in bacteremic patients, 47%, than in non-bacteremic patients, 36%, p = 0.04. We identified 8 subphenotypes, with different mortality rates, where pathogen detection in microbial samples were important for subphenotype distinction and outcome. In conclusion, bacteremic patients had higher mortality than their non-bacteremic counter-parts and bacteremia is more common in sepsis when studied in a clinical review. For reducing population heterogeneity and improve the outcome of trials and treatment for sepsis, distinction of subphenotypes might be useful and pathogen detection an important factor.

scholarly journals Culture-negative versus culture-positive in pyogenic spondylitis and analysis of risk factors for relapse

2021 ◽  
pp. 1-5
Author(s):  
Guohua Dai ◽  
Shuzhong Li ◽  
Chuqiang Yin ◽  
Yuanliang Sun ◽  
Jianwen Hou ◽  
...  
Keyword(s):  
Risk Factors ◽  
Pyogenic Spondylitis ◽  
Culture Positive ◽  
Culture Negative

scholarly journals Evaluation of the performance of clinical predictors in estimating the probability of pulmonary tuberculosis among smear-negative cases in Northern Ethiopia: a cross-sectional study

BMJ Open ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. e037913
Author(s):  
Mala George ◽  
Geert-Jan Dinant ◽  
Efrem Kentiba ◽  
Teklu Teshome ◽  
Abinet Teshome ◽  
...  
Keyword(s):  
Pulmonary Tuberculosis ◽  
Cross Sectional Study ◽  
Clinical Suspicion ◽  
Secondary Outcome ◽  
Northern Ethiopia ◽  
Sectional Study ◽  
Cross Sectional ◽  
Smear Negative ◽  
Culture Positive ◽  
Culture Negative

ObjectivesTo evaluate the performance of the predictors in estimating the probability of pulmonary tuberculosis (PTB) when all versus only significant variables are combined into a decision model (1) among all clinical suspects and (2) among smear-negative cases based on the results of culture tests.DesignA cross-sectional study.SettingTwo public referral hospitals in Tigray, Ethiopia.ParticipantsA total of 426 consecutive adult patients admitted to the hospitals with clinical suspicion of PTB were screened by sputum smear microscopy and chest radiograph (chest X-ray (CXR)) in accordance with the Ethiopian guidelines of the National Tuberculosis and Leprosy Program. Discontinuation of antituberculosis therapy in the past 3 months, unproductive cough, HIV positivity and unwillingness to give written informed consent were the basis of exclusion from the study.Primary and secondary outcome measuresA total of 354 patients were included in the final analysis, while 72 patients were excluded because culture tests were not done.ResultsThe strongest predictive variables of culture-positive PTB among patients with clinical suspicion were a positive smear test (OR 172; 95% CI 23.23 to 1273.54) and having CXR lesions compatible with PTB (OR 10.401; 95% CI 5.862 to 18.454). The regression model had a good predictive performance for identifying culture-positive PTB among patients with clinical suspicion (area under the curve (AUC) 0.84), but it was rather poor in patients with a negative smear result (AUC 0.64). Combining all the predictors in the model compared with only the independent significant variables did not really improve its performance to identify culture-positive (AUC 0.84–0.87) and culture-negative (AUC 0.64–0.69) PTB.ConclusionsOur finding suggests that predictive models based on clinical variables will not be useful to discriminate patients with culture-negative PTB from patients with culture-positive PTB among patients with smear-negative cases.

scholarly journals Comparison of Proportion and Resistance Ratio Methods for Drug Susceptibility Testing of Mycobacterium tuberculosis Isolated from Patients Attending National Tuberculosis Centre, Nepal

2010 ◽  
Vol 5 (1) ◽  
pp. 13-20
Author(s):  
S Acharya ◽  
P Ghimire ◽  
DK Khadka ◽  
S Nepali
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Fluorescence Microscopy ◽  
Susceptibility Testing ◽  
Drug Susceptibility ◽  
Drug Susceptibility Testing ◽  
Resistance Ratio ◽  
National Tuberculosis ◽  
Smear Negative ◽  
Culture Positive ◽  
Good Agreement

Background: Tuberculosis (TB) is among the most serious infectious cause of global morbidity and mortality. Emergence of Multi-drug resistant tuberculosis (MDR-TB) is posing an increased threat to TB control programs. Drug susceptibility testing (DST) of Mycobacterium tuberculosis (M. tuberculosis) isolates is important for tackling such problems. Setting: National Tuberculosis Centre (NTC), Thimi, Bhaktapur, Nepal. Objectives: Comparative evaluation of two in vitro DST methods in determining susceptibility of M. tuberculosis isolates from patients attending NTC, to front-line anti-TB drugs: (Isoniazid-INH, Rifampicin-RFP, Streptomycin-SM, and Ethambutol-EMB). Methodology: This study was conducted from Sep 2006-Jun 2007. A total of 862 sputum samples (diagnosis or follow up cases) collected from patients (type of patients or their categories was not differentiated in this study) attending NTC bacteriology lab for sputum direct smear microscopy were analyzed using fluorescence microscopy. All smear positive samples, smear negative samples requested for culture were cultured. All culture positive samples confirmed as M. tuberculosis by biochemical tests were processed for DST by both proportion (PR) and resistance ratio (RR) methods. Results: Out of 862 sputum samples analyzed, 226 (26.2%) samples were positive for Acid Fast Bacilli (AFB) by fluorescence microscopy. Among 323 samples 226 smear positive samples and 97 smear negative samples requested for culture), 221 (68.4%) were culture positive, 92 (28.5%) were culture negative and 10 (3.1%) were contaminated. Out of 221 isolates of M. tuberculosis, 57.5% were resistant to one or more drugs by the PR method and 56.6% by the RR method. Similarly, MDR isolates were 29.9% and 29% by PR and RR methods respectively. On correlation analysis using Mc Nemar Chi-square test, no significant difference between the two tests were observed (p>0.05). The results showed high agreement between both methods and agreement rates to INH, RFP, SM and EMB were 93.2%, 93.7%, 93.2% and 94.1% respectively. Similarly, the agreement rates between both methods using kappa analysis showed kappa (k) value of 0.86, 0.85, 0.86 and 0.84 for INH, RFP, SM and EMB respectively, which is believed to be good agreement between both methods (k=0.80 to 1.00: Very good agreement). Conclusion: In conclusion, this study showed that both the Proportion and Resistance ratio methods are equally good for determining drug susceptibility of M. tuberculosis. Keywords: Mycobacterium tuberculosis; Drug Susceptibility Testing; Proportion Method; Resistance Ratio Method. DOI: 10.3126/saarctb.v5i1.3078 SAARC J. Tuber. Lung Dis. HIV/AIDS 2008 Vol.5(1) 13-20

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