Reducing the risk of tuberculosis transmission for HCWs in high incidence settings

Development and preliminary evaluation toward a new tuberculosis treatment monitoring tool: the PATHFAST TB LAM Ag assay

The PATHFAST TB LAM Ag assay is based on a chemiluminescent enzyme immunoassay to quantify lipoarabinomannan (LAM) in sputum within 1 h, and was developed as an alternative to conventional culture methods for monitoring tuberculosis (TB) treatment. This study aimed to evaluate the analytical performance and initial clinical feasibility of using five Mycobacterium tuberculosis variants, 178 non-tuberculous mycobacteria (NTM), 34 upper respiratory and oral cavity microorganisms, 100 sputum specimens from untreated patients, and potential interfering substances, including 27 drugs. The results reveled a single-site repeatability coefficient of variation (CV) of 5.2%-7.0%, and a multi-site reproducibility CV of 7.1%-8.4%. The limit of blank, limit of detection, and limit of quantification were 3.03 pg/mL, 6.67 pg/mL, and 7.44 pg/mL, respectively. Linearity was observed over the analytical measurement range (10.0 pg/mL-50,000 pg/mL), and no hook effect was observed. The assay tended to cross-react with slow-growing NTMs, but not with common upper respiratory and oral cavity microorganisms, except Nocardia asteroides, Nocardia farcinica, and Tsukamurella paurometabola. No interference was observed in the presence of mucin, blood, or major anti-TB, anti-HIV, and anti-pneumonia drugs. Regarding clinical performance, the assay had a sensitivity of 88.8% (95% CI: 80.0%-94.0%) and specificity of 100.0% (95% CI: 83.9%-100.0%) using mycobacterial culture as the reference standard, and a correlation (Spearman's r = -0.770) was observed between LAM concentration and time to detection of culture. These findings show, for the first time, that the PATHFAST TB LAM Ag assay has potential value for monitoring TB treatment.

Coping efforts made: Psychological burden of people living with tuberculosis due to social stigma in society. A qualitative phenomenology study

The psychological burden is greatly felt by people living with tuberculosis because the characteristics of the disease are very visible and very contagious, and the obligation to take the right dose of medication with long treatment. This is what makes tuberculosis a very stigmatic disease. The aim of this research is to explore the psychological burden felt by people living with tuberculosis due to social stigma by society and how coping efforts are made. This research uses a qualitative phenomenological design through in-depth face-to-face interviews which take place in a semi-structured manner with the hope of obtaining complete data. The purposive sampling method was used in this research with Participatory Interpretative Phenomenology analysis involving 25 participants consisting of 16 men and 9 women. This research produced several themes, including 1) "The Perception of stigma limiting space and time", 2) "The Opportunities for interpersonal interaction become narrow", 3) "The mental stress as a challenging emotion", and 4) " Expanding coping efforts". The psychological burden is felt by people living with tuberculosis because society's treatment is felt to be very discriminatory due to the social stigma that has developed in society so they lose the opportunity to interact with society. For that reason, they tried to explore some of the personal and environmental resources used to modify adaptive coping in resolving perceived psychological burdens. Given the possibility of ongoing stigma and discrimination during tuberculosis treatment programs, it is important to consider the psychological burden in this context, both on the general population and on groups affected by stigma.

Surveillance of close contacts of patients with infectious tuberculosis: a prospective cohort study

BACKGROUND

A long-term follow-up of close contacts to monitor their infection status is essential to formulate a promising screening strategy. The study aimed to assess the dynamics of tuberculosis (TB) infection using Interferon-γ release assay (IGRA) and determine risk factors associated with TB infection.

METHODS

Definite TB patients were interviewed and their household contacts were screened for TB infection by IGRA during 12-month longitudinal investigation.

RESULTS

We included in our analyses 184 household contacts of 92 index TB patients. 87 individuals (47.3%) in contact group progressed to TB infection, of whom 86 developed into IGRA positive within 24 weeks. Close contacts with a higher age and comorbidities are easier to exhibit TB infection. Analysis showed that risk factors for becoming IGRA-positive individuals included residence, older age, comorbidities, BCG scar and high bacterial load. Contacts with BCG scar had a lower IGRA-positive rate.

CONCLUSION

IGRA conversion generally occurs within 24 weeks after exposure. The TB transmission happens since subclinical TB stage and the presence of BCG scar is an independent protective factor reducing risk of TB infection among close contacts. Repeated IGRA tests are sensible to conducted among close contacts at 24 weeks after exposure to identify the IGRA-positive individuals.

Investigating socio-ecological factors influencing implementation of tuberculosis infection prevention and control in rural Papua New Guinea

BACKGROUND

Tuberculosis (TB) is a highly transmissible infectious disease killing millions of people yearly, particularly in low-income countries. TB is most likely to be transmitted in healthcare settings with poor infection control practices. Implementing TB infection prevention and control (TB-IPC) is pivotal to preventing TB transmission in healthcare settings. This study investigated diverse stakeholders' perspectives relating to barriers and strategies for TB-IPC in rural hospitals in Papua New Guinea.

METHODS

Multiple qualitative case studies were conducted with 32 key stakeholders with experience in TB services. Data collection drew on three primary sources to triangulate data: semi-structured interviews, document reviews and field notes. The data were analyzed using hybrid deductive-inductive thematic analysis.

RESULTS

Our results reveal that key stakeholders perceive multiple interdependent factors that affect TB-IPC practice. The key emerging themes include strategic planning for and prioritizing TB-IPC guidelines; governance, leadership and accountability at the provincial level; community attitudes towards TB control; institutional capacity to deliver TB care, healthcare workers' safety, and long-term partnership and integration of TB-IPC programmes into the broad IPC programme.

CONCLUSIONS

The evidence suggests that a multi-perspective approach is crucial for TB-IPC guidelines in healthcare institutions. Interventions focusing on addressing health systems strengthening may improve the implementation of TB-IPC guidelines.

Particulate matter deposition and its impact on tuberculosis severity: A cross-sectional study in Taipei

The objective of this study was to examine the association between the lung lobe-deposited dose of inhaled fine particulate matter (PM2.5) and chest X-ray abnormalities in different lung lobes of pulmonary tuberculosis (TB), multidrug-resistant tuberculosis (MDR-TB), and non-tuberculosis mycobacteria infections (NTM). A cross-sectional study was conducted between 2014 and 2022, comprising 1073 patients who were recruited from chest department clinic in a tertial refer hospital in Taipei City, Taiwan. Ambient 1-, 7-, and 30-day PM2.5 exposure and the deposition of PM2.5 in different lung lobes were estimated in each subject. The β coefficient for PM2.5 and deposited PM2.5 in lungs with the outcome variables (pulmonary TB, MDR-TB, and NTM infection) was derived through regression analysis and adjusted for age, gender, BMI, smoking status, and family income. We observed that a 1 μg/m3 increase in ambient PM2.5 was associated with an increase of MDR-TB infections of 0.004 times (95%CI: 0.001-0.007). A 1 μg/m3 increase in 1-day and 7-day PM2.5 deposition in left upper lobe and left lower lobe was associated with an increase in chest X-ray abnormalities of 9.19 % and 1.18 % (95%CI: 0.87-17.51 and 95%CI: 0.08-2.28), and 4.52 % and 5.20 % (95%CI: 0.66-8.38 and 95%CI: 0.51-9.89) in left lung of TB patients, respectively. A 1 μg/m3 increase in 30-day PM2.5 deposition in alveolar region was associated with an increase in percent abnormality of 2.50 % (95%CI: 0.65-4.35) in left upper lobe and 3.33 % (95%CI: 0.65-6.01) in right middle lobe, while in total lung was 0.63 % (95%CI: 0.01-1.27) in right upper lobe and 0.37 % (95%CI, 0.06-0.81) in right lung of MDR-TB patients. Inhaled PM2.5 deposition in lungs was associated with an exacerbation of the radiographic severity of pulmonary TB, particularly in pulmonary MDR-TB patients in upper and middle lobes. Particulate air pollution may potentially exacerbate the radiographic severity and treatment resistance in individuals with pulmonary TB.

Drug-resistant tuberculosis: a persistent global health concern

Drug-resistant tuberculosis (TB) is estimated to cause 13% of all antimicrobial resistance-attributable deaths worldwide and is driven by both ongoing resistance acquisition and person-to-person transmission. Poor outcomes are exacerbated by late diagnosis and inadequate access to effective treatment. Advances in rapid molecular testing have recently improved the diagnosis of TB and drug resistance. Next-generation sequencing of Mycobacterium tuberculosis has increased our understanding of genetic resistance mechanisms and can now detect mutations associated with resistance phenotypes. All-oral, shorter drug regimens that can achieve high cure rates of drug-resistant TB within 6-9 months are now available and recommended but have yet to be scaled to global clinical use. Promising regimens for the prevention of drug-resistant TB among high-risk contacts are supported by early clinical trial data but final results are pending. A person-centred approach is crucial in managing drug-resistant TB to reduce the risk of poor treatment outcomes, side effects, stigma and mental health burden associated with the diagnosis. In this Review, we describe current surveillance of drug-resistant TB and the causes, risk factors and determinants of drug resistance as well as the stigma and mental health considerations associated with it. We discuss recent advances in diagnostics and drug-susceptibility testing and outline the progress in developing better treatment and preventive therapies.

Mycobacterial Rv1804c binds to the PEST domain of IκBα and activates macrophage-mediated proinflammatory responses

Recognition of the components of Mycobacterium tuberculosis (Mtb) by macrophages is vital for initiating a cascade of host immune responses. However, the recognition of Mtb-secretory proteins by the receptor-independent pathways of the host remains unclear. Rv1804c is a highly conserved secretory protein in Mtb. However, its exact function and underlying mechanism in Mtb infection remain poorly understood. In the present study, we observed that Rv1804c activates macrophage-mediated proinflammatory responses in an IKKα-independent manner. Furthermore, we noted that Rv1804c inhibits mycobacterial survival. By elucidating the underlying mechanisms, we observed that Rv1804c activates IκBα by directly interacting with its PEST domain. Moreover, Rv1804c was enriched in attenuated but not in virulent mycobacteria and associated with the disease process of tuberculosis. Our findings provide an alternative pathway via which a mycobacterial secretory protein activates macrophage-mediated proinflammatory responses. Our study findings may shed light on the prevention and treatment of tuberculosis.

Knowledge, Attitudes, and Preventive Practices Regarding Tuberculosis Among Healthcare Workers and Patients in India: A Mixed-Method Study

BACKGROUND

Tuberculosis (TB) remains a major public health challenge in India. Healthcare workers (HCWs) and TB patients are critical to disease transmission and prevention. This study evaluated and compared knowledge, attitudes, and practices related to TB infection control.

MATERIALS AND METHODS

This was a mixed-method study that included a cross-sectional survey conducted among 167 HCWs and 346 patients with TB at tertiary hospitals in western Gujarat using a validated questionnaire. Additionally, 20 HCWs and 20 patients were interviewed to gain qualitative insights. Between-group analyses were performed, and multivariate regressions identified predictors of knowledge and compliance, while thematic analysis explored qualitative insights.

RESULTS

A total of 142/167 (85.0%) HCWs had good knowledge, whereas 208/346 (60.1%) patients had good knowledge. A total of 151/167 (90.4%) HCWs had positive attitudes, whereas 242/346 (69.9%) patients had positive attitudes. A total of 159/167 (95.2%) HCWs practiced good preventive behaviors, whereas 225/346 (65.0%) patients did. HCWs demonstrated significantly higher mean knowledge scores (9.2 vs. 7.1, p<0.001) and higher median attitude scores (ranging from 5 with IQR 4-5 to 5 with IQR 5-5) compared to patients (ranging from 4 with IQR 3-5 to 5 with IQR 4-5) across all attitude statements assessed using the Likert scale (p<0.001). Being an HCW was associated with good knowledge (adjusted odds ratio (AOR) 2.5, 95% CI 1.5-4.1), positive attitudes (AOR 2.2, 95% CI 1.4-3.6), and good practices (AOR 3.1, 95% CI 1.8-5.2). The qualitative themes highlighted the need for accessible education, clear communication, adequate resourcing, and personal responsibility.

CONCLUSION

This study identified gaps in TB prevention knowledge and practices among patients compared to those among HCWs in India. Tailored educational initiatives, optimized health communication, improved infrastructure, and accessible messaging can help individuals assimilate appropriate infection control behaviors among healthcare system actors and communities toward ending TB.

Accuracy of digital chest x-ray analysis with artificial intelligence software as a triage and screening tool in hospitalized patients being evaluated for tuberculosis in Lima, Peru

Tuberculosis (TB) transmission in healthcare facilities is common in high-incidence countries. Yet, the optimal approach for identifying inpatients who may have TB is unclear. We evaluated the diagnostic accuracy of qXR (Qure.ai, India) computer-aided detection (CAD) software versions 3.0 and 4.0 (v3 and v4) as a triage and screening tool within the FAST (Find cases Actively, Separate safely, and Treat effectively) transmission control strategy. We prospectively enrolled two cohorts of patients admitted to a tertiary hospital in Lima, Peru: one group had cough or TB risk factors (triage) and the other did not report cough or TB risk factors (screening). We evaluated the sensitivity and specificity of qXR for the diagnosis of pulmonary TB using culture and Xpert as primary and secondary reference standards, including stratified analyses based on risk factors. In the triage cohort (n = 387), qXR v4 sensitivity was 0.91 (59/65, 95% CI 0.81-0.97) and specificity was 0.32 (103/322, 95% CI 0.27-0.37) using culture as reference standard. There was no difference in the area under the receiver-operating-characteristic curve (AUC) between qXR v3 and qXR v4 with either a culture or Xpert reference standard. In the screening cohort (n = 191), only one patient had a positive Xpert result, but specificity in this cohort was high (>90%). A high prevalence of radiographic lung abnormalities, most notably opacities (81%), consolidation (62%), or nodules (58%), was detected by qXR on digital CXR images from the triage cohort. qXR had high sensitivity but low specificity as a triage in hospitalized patients with cough or TB risk factors. Screening patients without cough or risk factors in this setting had a low diagnostic yield. These findings further support the need for population and setting-specific thresholds for CAD programs.

Accuracy of digital chest x-ray analysis with artificial intelligence software as a triage and screening tool in hospitalized patients being evaluated for tuberculosis in Lima, Peru

Introduction

Tuberculosis (TB) transmission in healthcare facilities is common in high-incidence countries. Yet, the optimal approach for identifying inpatients who may have TB is unclear. We evaluated the diagnostic accuracy of qXR (Qure.ai, India) computer-aided detection (CAD) software versions 3.0 and 4.0 (v3 and v4) as a triage and screening tool within the FAST (Find cases Actively, Separate safely, and Treat effectively) transmission control strategy.

Methods

We prospectively enrolled two cohorts of patients admitted to a tertiary hospital in Lima, Peru: one group had cough or TB risk factors (triage) and the other did not report cough or TB risk factors (screening). We evaluated the sensitivity and specificity of qXR for the diagnosis of pulmonary TB using culture and Xpert as primary and secondary reference standards, including stratified analyses based on risk factors.

Results

In the triage cohort (n=387), qXR v4 sensitivity was 0.91 (59/65, 95% CI 0.81-0.97) and specificity was 0.32 (103/322, 95% CI 0.27-0.37) using culture as reference standard. There was no difference in the area under the receiver-operating-characteristic curve (AUC) between qXR v3 and qXR v4 with either a culture or Xpert reference standard. In the screening cohort (n=191), only one patient had a positive Xpert result, but specificity in this cohort was high (>90%). A high prevalence of radiographic lung abnormalities, most notably opacities (81%), consolidation (62%), or nodules (58%), was detected by qXR on digital CXR images from the triage cohort.

Conclusions

qXR had high sensitivity but low specificity as a triage in hospitalized patients with cough or TB risk factors. Screening patients without cough or risk factors in this setting had a low diagnostic yield. These findings further support the need for population and setting-specific thresholds for CAD programs.

The Impact of Personal Protective Equipment on Healthcare Workers on COVID-19 Duty in a Tertiary Care Hospital in South India

Context The proper usage of personal protective equipment (PPE) must be prioritised for health care workers (HCWs), where shortages and prolonged use of personal protective equipment can threaten safety in essential health services. Aims To evaluate the effect of personal protective equipment on the health and well-being of HCWs, physicians, nurses, and technicians on duty for COVID-19 rotational postings. Settings and design This cross-sectional study was done by simple random sampling. Methods and materials This study was conducted at a tertiary care centre in South India to assess the utilisation of personal protective equipment (PPE) during the second wave of COVID-19. A physical questionnaire was distributed to a total of 266 healthcare workers, aged 20 to 50, who had worked for a minimum of three consecutive days between May and August 2021. The objective of the study was to evaluate the effectiveness of PPE use among healthcare workers during the second wave of the COVID-19 pandemic. Statistical analysis The data analysis in this study was conducted using IBM Statistical Package for Social Sciences (SPSS) version 19 (IBM Corp., Armonk, New York). The mean and standard deviation, or median, were used to present continuous variables, while frequency and percentage were used to present categorical variables. Furthermore, the minimum sample size required for this study was calculated to be 246 participants. Results The survey included 266 healthcare workers. The mean+/-SD of age was 28.18+/-5.64 and consisted of females (54.51%) and males (45.48%). The postings were in emergency (13.15%), intensive care unit (30.82%), and ward (56.01%), respectively. The HCWs who used PPE for four to seven days reported more symptoms than those who used it for one to three days. Discomforts experienced while wearing PPE were chest suffocation (49.62%), difficulty in performing intubation (36.09%), difficulty in seeing clearly (68.79%), dizziness (49.62%), excessive sweating (75.56%), micturition desire (52.63%), nausea (42.48%), retro-auricular pain (56.76%), stomach burns (27.44%), and thirst or dry throat (78.57%). The symptoms suffered after doffing were tiredness (69.17%), dry mouth (67.29%), dizziness (43.60%), headache (55.63%), chest suffocation (36.46%), dry skin (57.14%), reduced ability to concentrate (48.12%), dark-coloured urine (55.63%), reduced alertness (42.48%), and stomach burns (28.94%). The first thoughts after doffing were to drink water (68.42%), eat something (36.09%), clean yourself (61.27%), urinate (33.08%), and have some rest (29.32%), respectively. 81 (30.45%). The HCWs suffered skin injuries while wearing gloves. The time for restoring after a shift was 12 hours (37.59%), 24 hours (34.21%), 36 hours (11.65%), and 48 hours (16.59%). Pressure sores were reported on the forehead by 53 (19.92%) participants, the nose by 54 (20.30%), the cheek by 31 (11.65%), and behind the ear by 77 (65.71%) participants. The optimal size of PPE was experienced only by 76 (28.57%) participants, while 73 (27.44%) of them felt tight and 117 (43.98%) felt loose. Conclusions To minimise discomfort while managing infectious diseases, HCWs can adopt several practices like taking regular breaks, ensuring humane working hours, utilising high-quality PPE, and wearing properly fitting gear. By implementing these measures, HCWs can enhance their ability to handle infectious diseases effectively while prioritising their comfort and well-being.

Improving Nurses' Knowledge, Practice, and Self-Efficacy Regarding Caring Patients with Tuberculosis: A Quasi-Experimental Design

Background

Tuberculosis (TB) control depends on healthcare professionals 'knowledge, practice, and self-efficacy when managing high-risk groups. So the study aimed to evaluate the effectiveness of a structured educational program in improving nurses' knowledge, practice, and self-efficacy in caring for patients with TB.

Material and Methods

A pre-test post-test quasi-experimental design was conducted on 36 nurses at Chest hospital Al Masah al Bahri in port said city and the Chest Hospital in Damietta City, Egypt. Data were collected using three self-administered questionnaires to assess knowledge, practice, and self-efficacy by using convenience sampling from March to August 2019. Data analyses were done by using a paired t-test, a Student t-test, and an F-test analysis of variance.

Results

Based on data related to the two groups before and after the study in knowledge, practice (t = 8.27, p < 0.001), and self-efficacy (t = 28.91, p < 0.001), there was a significant difference between knowledge and overall knowledge scores (t=14, p < 0.001). Mean scores were significantly increased for practice items about the nursing role in medication, directed observed therapy, and the overall practice score; and for self-efficacy, which increased from 27.58 to 37.86 (p = <0.001). The results indicate that nurses' knowledge, practice, and self-efficacy were enhanced by the implementation of the educational program.

Conclusions

There is scope for development in knowledge, practice, and self-efficacy using the educational program among nurses. Training programs must be implemented in quality control to aid nurses in realizing the significance of information in reducing disease and death and enhancing the quality of care.

Bacteriophages of Mycobacterium tuberculosis, their diversity, and potential therapeutic uses: a review

Tuberculosis (TB) caused by Mycobacterium tuberculosis (M. tuberculosis) is a highly infectious disease and worldwide health problem. Based on the WHO TB report, 9 million active TB cases are emerging, leading to 2 million deaths each year. The recent emergence of multidrug-resistant tuberculosis (MDR-TB) and extensively drug-resistant tuberculosis (XDR-TB) strains emphasizes the necessity to improve novel therapeutic plans. Among the various developing antibacterial approaches, phage therapy is thought to be a precise hopeful resolution. Mycobacteriophages are viruses that infect bacteria such as Mycobacterium spp., containing the M. tuberculosis complex. Phages and phage-derived proteins can act as promising antimicrobial agents. Also, phage cocktails can broaden the spectrum of lysis activity against bacteria. Recent researches have also shown the effective combination of antibiotics and phages to defeat the infective bacteria. There are limitations and concerns about phage therapy. For example, human immune response to phage therapy, transferring antibiotic resistance genes, emerging resistance to phages, and safety issues. So, in the present study, we introduced mycobacteriophages, their use as therapeutic agents, and their advantages and limitations as therapeutic applications.