Reduce Tuberculosis Transmission Research Articles

Effects of respiratory isolation for tuberculosis to reduce community-based transmission: a systematic review.

Respiratory isolation of people with pulmonary tuberculosis (TB), including after treatment initiation, is used to prevent community-based transmission; yet guidelines on duration are limited and implementation is heterogeneous. This systematic review synthesized evidence on respiratory isolation for TB to inform National TB Coalition of America guidelines. After searching six databases, eight reviewers screened and extracted data in duplicate on effects of respiratory isolation compared to no isolation or masking. Studies were stratified by outcomes: TB infection or disease in contacts, mortality, hospitalization duration, patient and health system costs, and impact on mental health or stigma. We used a convergent integrated approach to synthesize quantitative and qualitative findings and assess limitations. Seventeen studies were included. There were limited data directly comparing isolation to non-isolation interventions, including effects after treatment initiation. One randomized controlled trial suggested treatment in a sanatorium versus at home did not affect TB incidence in contacts. Modelling studies suggest isolation may reduce transmission, but relied on various assumptions, and isolation was implemented alongside other interventions. Descriptive, mixed-methods, and qualitative studies described adverse impacts of isolation on employment, education, food/housing security, and mental health due to transmission fears, stigma and social isolation. Impacts were compounded in marginalized groups including indigenous and incarcerated persons. Data to support current isolation practices, particularly after effective treatment initiation, to reduce TB transmission in communities are limited. Public health guidance should weigh the negative impacts on people with TB against decreased community transmission to make evidence-based decisions about respiratory isolation.

Comparative Evaluation of GeneXpert With Ziehl-Neelsen (ZN) Stain in Samples of Suspected Tuberculosis Cases at a Tertiary Care Teaching Hospital in Central India.

Background Tuberculosis (TB) remains a significant public health challenge, particularly in developing countries, where delayed diagnosis contributes to ongoing transmission. Ziehl-Neelsen (ZN) smear microscopy, commonly used for TB diagnosis, has limitations in sensitivity, especially in cases of extrapulmonary tuberculosis (ETB). The GeneXpert Mycobacterium tuberculosis (MTB)/rifampicin (RIF) assay, a molecular diagnostic tool, offers rapid and accurate detection of MTBand RIF resistance. This study aimed to compare the diagnostic efficacy of GeneXpert MTB/RIF with ZN staining in detecting pulmonarytuberculosis (PTB) and ETB. Methods A prospective study was conducted over two years (April 2022 to April 2024) at a tertiary care teaching hospitalin India. A total of 319 clinical samples from patients with suspected PTB and ETB were analyzed. Samples underwent ZN staining and GeneXpert MTB/RIF assay. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) were calculated using mycobacterial culture as the gold standard. The chi-square test was employed to compare diagnostic accuracy, with a p-value of <0.05 considered statistically significant. Results Of the 319 samples, ZN staining was positive in 18.2% of cases, while GeneXpert was positive in 21.6%. GeneXpert demonstrated a perfect sensitivity of 100% and a specificity of 98.81%, compared to ZN staining's sensitivity of 84.85% and specificity of 99.21%. GeneXpert showed superior performance in detecting TB in both pulmonary and extrapulmonary samples, with a statistically significant difference (p<0.001). Additionally, GeneXpert identified six cases of RIF resistance. Conclusion The GeneXpert MTB/RIF assay outperforms ZN staining in diagnosing TB, offering higher sensitivity and comparable specificity. Its ability to detect RIF resistance adds significant clinical value. Despite its cost, the integration of GeneXpert into routine diagnostic workflows, particularly in high TB prevalence areas, is recommended to enhance early detection and treatment, thereby reducing TB transmission.

The Impact of Vaccination Programs on the Prevention of Infectious Disease Tuberculosis: A Case Study with Gasabo District in Rwanda

Introduction Tuberculosis (TB) remained a significant public health challenge globally, including in Gasabo District, Rwanda. Vaccination programs, particularly Bacille Calmette-Guérin (BCG) vaccination, played a crucial role in TB prevention. This study aimed to assess the impact of vaccination programs on TB prevention in Gasabo District, Rwanda, by analyzing vaccination coverage, TB incidence rates, demographic characteristics, and healthcare system factors.  Methods A retrospective cohort study design was employed, utilizing secondary data sources from healthcare facilities in Gasabo District. Data on vaccination coverage, TB incidence rates, demographic characteristics, and healthcare system factors were collected and analyzed. Statistical methods, including regression analysis and descriptive statistics, were used to assess the association between vaccination programs and TB prevention outcomes.  Findings The study found a significant association between BCG vaccination coverage and lower TB incidence rates in Gasabo District. Higher vaccination coverage was associated with reduced TB incidence rates, particularly among children. However, challenges such as incomplete vaccination data, potential confounding factors, and socio-economic disparities were identified. Despite these challenges, vaccination programs were found to be effective in reducing TB transmission and protecting vulnerable populations from TB infection.  Conclusion The findings highlighted the importance of vaccination programs in TB prevention efforts in Gasabo District, Rwanda. Strengthening vaccination coverage, enhancing healthcare system capacity, addressing socio-economic determinants, fostering collaborations, promoting research and innovation, and strengthening surveillance and monitoring systems are essential for optimizing TB prevention efforts. By implementing these recommendations, we can accelerate progress towards ending the TB epidemic and improving public health outcomes in Gasabo District and beyond.

Community-Wide Active Case Finding for Tuberculosis: Time to Use the Evidence We Have.

Tuberculosis, caused by the Mycobacterium tuberculosis (Mtb) bacteria, is one of the world's deadliest infectious diseases. Despite being the world's oldest pandemic, tuberculosis is very much a challenge of the modern era. In high-incidence settings, all people are at risk, irrespective of whether they have common vulnerabilities to the disease warranting the current WHO recommendations for community-wide tuberculosis active case finding in these settings. Despite good evidence of effectiveness in reducing tuberculosis transmission, uptake of this strategy has been lacking in the communities that would derive greatest benefit. We consider the various complexities in eliminating tuberculosis from the first principles of the disease, including diagnostic and other challenges that must be navigated under an elimination agenda. We make the case that community-wide tuberculosis active case finding is the best strategy currently available to drive elimination forward in high-incidence settings and that no time should be lost in its implementation. Recognizing that high-incidence communities vary in their epidemiology and spatiosocial characteristics, tuberculosis research and funding must now shift towards radically supporting local implementation and operational research in communities. This "preparing of the ground" for scaling up to community-wide intervention centers the local knowledge and local experience of community epidemiology to optimize implementation practices and accelerate reductions in community-level tuberculosis transmission.

Outcome of Abdominal Tuberculosis Complicated by Portal Hypertension, Pulmonary Tuberculosis, and Severe Acute Malnutrition

Background: Abdominal tuberculosis (TB) is a form of extrapulmonary TB that can present with or without involvement of the lungs. The diagnosis is difficult to establish, which may lead to diagnostic delays. Effective management of adolescent TB requires a holistic approach from various medical disciplines and interventions. This case presented a rare case 13-year-old girl diagnosed with abdominal TB Case: A 13-year-old girl presented with seven-months history of subfebrile fever, lymph node enlargement, abdominal distention, pallor, and severe weight loss. She was diagnosed with abdominal TB. The diagnosis was further complicated by portal hypertension, pulmonary TB, and severe acute malnutrition. To address these challenges, a multidisciplinary treatment plan was implemented and closely monitored for a period of 12 months Discussion: Multiple factors are significantly contributing to the successful outcome of the treatment for abdominal tuberculosis, including good adherence to the prescribed anti-tuberculous medications, absence of side effects from the drugs, the patient's positive knowledge, attitude and health behaviours, and housing and environmental health. Conclusion: This case highlights the importance of factors influencing disease outcomes of abdominal TB. Proper management of the factors would lead to significant clinical and nutritional status improvement, reduce TB transmission, and improved the overall quality of life.

Delays in health seeking, diagnosis and treatment for tuberculosis patients in Mongolia: an analysis of surveillance data, 2018-2021.

Early diagnosis and treatment of infectious tuberculosis (TB) is essential to the attainment of global targets specified in the End TB Strategy. Using case-based TB surveillance data, we analysed delays in health seeking, diagnosis and treatment among TB patients in Mongolia from 2018 to 2021. We calculated the median and interquartile range (IQR) for "diagnostic delay," defined as the time from symptom onset to diagnosis, subdivided into "health-seeking delay" (time from symptom onset to first visit to a health facility) and "health facility diagnostic delay" (time from first health facility visit to diagnosis), and for "treatment delay," defined as the time from diagnosis to start of treatment. We also calculated "total delay," defined as the time from symptom onset to treatment start. Based on data for 13 968 registered TB patients, the median total delay was estimated to be 37 days (IQR, 19-76). This was mostly due to health-seeking delay (median, 23 days; IQR, 8-53); in contrast, health facility diagnostic delay and treatment delay were relatively short (median, 1day; IQR, 0-7; median, 1day; IQR, 0-7, respectively). In 2021, health-seeking delay did not differ significantly between men and women but was shorter in children than in adults and shorter in clinically diagnosed than in bacteriologically confirmed TB cases. Health-seeking delay was longest in the East region (median, 44.5days; IQR, 20-87) and shortest in Ulaanbaatar (median, 9; IQR, 14-64). TB treatment delay was similar across sexes, age groups and types of TB diagnosis but slightly longer among retreated cases and people living in Ulaanbaatar. Efforts to reduce TB transmission in Mongolia should prioritize decreasing delays in health seeking.

Motivational Interviewing with Progressive Muscle Relaxation for Anxiety Disorders in Tuberculosis

Background:Individuals with Tuberculosis (TB) may experience anxiety due to the disease's uncertain treatment, prognosis, and subsequent social judgment. It may affect the patient's motivation to engage in the treatment, boosting its effectiveness and reducing tuberculosis transmission. Interventions are required to help people alleviate their anxiety about tuberculosis. Objective:The primary objective of this study is to investigate how motivational interviewing and progressive muscle relaxation impact anxiety levels among individuals with tuberculosis. Methods:The study employed a quasi-experimental pretest-posttest control group design. Participants were chosen through convenience sampling based on specific inclusion and exclusion criteria. Atotal of 60 clients participated, with 30 assigned to the intervention groups and 30 to the control groups. This study used the Zung Anxiety Self-Assessment instrument. An analysis of differences in anxiety used Wilcoxon and Mann-Whitney. Results: In the pre-test, the majority of participants had mild anxiety levels; 70% (49.30 ± 8.526) in the intervention groups and 63.3% (45.43± 8.423) in the control groups. In the post-test, there has been a decrease in anxiety levels in the intervention group at 93.3% (30.90 ± 7.572), but anxiety levels remained the same in the control group of 66.7% (43.97±7.346). According to the statistical analysis, the intervention group achieved a p-value of 0.000, indicating a substantial variance in anxiety levels before and after the intervention. In contrast, the control group recorded a p-value of 0.785, suggesting that there was no significant alteration in anxiety levels before and after the intervention. Conclusion:Progressive muscle relaxation can alleviate tension, and motivational interviewing can boost motivation and help clients deal with anxiety triggers. Both interventions can be considered as extra treatments for tuberculosis patients who experience anxiety

Assessment of tuberculosis transmission probability in three Thai prisons based on five dynamic models.

This study aimed to assess and compare the probability of tuberculosis (TB) transmission based on five dynamic models: the Wells-Riley equation, two Rudnick & Milton-proposed models based on air changes per hour (ACH) and liters per second per person (L/s/p), the model proposed by Issarow et al, and the Applied Susceptible-Exposed-Infected-Recovered (SEIR) TB transmission model. This study also aimed to determine the impact of model parameters on such probabilities in three Thai prisons. A cross-sectional study was conducted using data from 985 prison cells. The TB transmission probability for each cell was calculated using parameters relevant to the specific model formula, and the magnitude of the model agreement was examined by Spearman's rank correlation and Bland-Altman plot. Subsequently, a multiple linear regression analysis was conducted to investigate the influence of each model parameter on the estimated probability. Results revealed that the median (Quartiles 1 and 3) of TB transmission probability among these cells was 0.052 (0.017, 0.180). Compared with the pioneered Wells-Riley's model, the remaining models projected discrepant TB transmission probability from less to more commensurate to the degree of model modification from the pioneered model as follows: Rudnick & Milton (ACH), Issarow et al., and Rudnick & Milton (L/s/p), and the applied SEIR models. The ventilation rate and number of infectious TB patients in each cell or zone had the greatest impact on the estimated TB transmission probability in most models. Additionally, the number of inmates in each cell, the area per person in square meters, and the inmate turnover rate were identified as high-impact parameters in the applied SEIR model. All stakeholders must urgently address these influential parameters to reduce TB transmission in prisons. Moreover, further studies are required to determine their relative validity in accurately predicting TB incidence in prison settings.

Limited effect of reducing pulmonary tuberculosis incidence amid mandatory facial masking for COVID-19

Although the incidence and mortality rates associated with tuberculosis (TB) have been decreasing in many countries, TB remains a major public health concern. Obligatory facial masking and reduced health-care capacity because of COVID-19 may substantially influence TB transmission and care. The Global Tuberculosis Report 2021 published by the World Health Organization indicated a TB rebound at the end of 2020, which coincided with the COVID-19 pandemic. We explored this rebound phenomenon in Taiwan by investigating whether TB incidence and mortality are affected by COVID-19 because of their common route of transmission. In addition, we investigated whether the incidence of TB varies across regions with different incidences of COVID-19. Data (2010–2021) regarding annual new cases of TB and multidrug-resistant TB were collected from the Taiwan Centers for Disease Control. TB incidence and mortality were assessed in Taiwan’s seven administrative regions. Over the last decade, TB incidence decreased continually, even during 2020 and 2021, the years coinciding with the COVID-19 pandemic. Notably, TB incidence remained high in regions with low COVID-19 incidence. However, the overall decreasing trends of TB incidence and mortality remained unchanged during the pandemic. Facial masking and social distancing may prevent COVID-19 transmission but exhibit limited efficacy in reducing TB transmission. Thus, during health-related policymaking, policymakers must consider TB rebound, even in the post-COVID-19 era.

Delay in the diagnosis and treatment of tuberculosis in prisons in Mato Grosso do Sul, Brazil.

The number of tuberculosis (TB) cases in prisons is higher than that in the general population and has been reported as the most common cause of death in prisons. This study evaluated the delay in the diagnosis and treatment of TB in Brazilian prisons. A retrospective cohort study was conducted between 2007 and 2015 using data from the five largest male prisons in Mato Grosso do Sul, Brazil. TB case data was collected from the National Database of Notifiable Diseases (SINAN), GAL-LACEN, and prison medical records. The following variables were recorded: prison, year of diagnosis, age, race, education, HIV status, smoking status, comorbidities, number of symptoms, percentage of cures, delay in diagnosis, patient delay, provider delay, laboratory delay, and delay in treatment. Descriptive statistics were used for the variables of interest. A total of 362 pulmonary TB cases were identified. The average time between the first symptom and reporting of data was 94 days. The mean time between symptom onset and laboratory diagnosis was 91 days. The average time from symptom onset to first consultation was 80 days. The time between diagnosis and treatment initiation was 5 days. Delays were significant between reporting of the first symptoms and diagnosis and significantly smaller from the time between notification and start of treatment. Control strategies should be implemented to diagnose cases through active screening, to avoid delays in diagnosis and treatment, and to reduce TB transmission.

Improved completing-treatment support among tuberculosis support group members through the CERMAT (Smart Against TB Transmission) program

Tuberculosis (TB) was declared a global emergency for humanity by the World Health Organization in 2015. According to Global Report TB data in 2016, Indonesia is one of the 30 countries in the world that has the highest TB caseload, especially Human Immunodeficiency Virus (HIV)-TB and (Multi Drug Resistant Tuberculosis (MDR) TB) cases during the 2016-2020 period (Global Tuberculosis Report, 2016). The high rise of MDR TB cases has great potential for transmission and an increase in the number of new TB cases. Efforts to optimize the handling of care and treatment, as well as to accelerate the determination of the diagnosis need to be conducted vigilantly on all lines, especially efforts to increase the ability to prevent transmission, provide quality follow-up care, and community-based treatment. Forming support groups is one of community health nursing strategies for TB prevention. A support group provides assistance to increase TB medication adherence and reduce TB transmission. TB control strategies are conducted by implementing CERMAT (Smart Against TB Transmission) to TB support groups that combine education intervention and skills to prevent TB transmission in the community setting. Community health nursing though the nursing process has established a system with recognition of the variables that affect health status and individual behaviors against TB disease. The nursing strategy intervention in the community is done at all levels, such as health education, group process, partnership, and community empowerment. The CERMAT package implemented in the TB support group is an evidence-based nursing practice. It was applied to 70 samples of adult TB clients at Curug, Cimanggis, Depok. The sampling was selected with a non-probability quota sampling technique. This study used an experimental design with paired t-test data analysis to determine the improvement in the skills of the TB support group after the support group intervention was done. It showed there was influence of the CERMAT method on the level of good support for completing TB treatment in Curug Village, with increased the mean of completed treatment by 2.42 with a p value 0.00 (p &lt;0.05). The CERMAT method can be applied as one of the nursing interventions to increase TB clients’ adherence. This intervention can be done by the person who is responsible for the TB program at the Community Health Center. The CERMAT method needs to be continued and evaluated regularly by involving health care volunteers.

Model-based Analysis of Tuberculosis Genotype Clusters in the United States Reveals High Degree of Heterogeneity in Transmission and State-level Differences Across California, Florida, New York, and Texas.

Reductions in tuberculosis (TB) transmission have been instrumental in lowering TB incidence in the United States. Sustaining and augmenting these reductions are key public health priorities. We fit mechanistic transmission models to distributions of genotype clusters of TB cases reported to the Centers for Disease Control and Prevention during 2012-2016 in the United States and separately in California, Florida, New York, and Texas. We estimated the mean number of secondary cases generated per infectious case (R0) and individual-level heterogeneity in R0 at state and national levels and assessed how different definitions of clustering affected these estimates. In clusters of genotypically linked TB cases that occurred within a state over a 5-year period (reference scenario), the estimated R0 was 0.29 (95% confidence interval [CI], .28-.31) in the United States. Transmission was highly heterogeneous; 0.24% of simulated cases with individual R0>10 generated 19% of all recent secondary transmissions. R0 estimate was 0.16 (95% CI, .15-.17) when a cluster was defined as cases occurring within the same county over a 3-year period. Transmission varied across states: estimated R0s were 0.34 (95% CI, .3-.4) in California, 0.28 (95% CI, .24-.36) in Florida, 0.19 (95% CI, .15-.27) in New York, and 0.38 (95% CI, .33-.46) in Texas. TB transmission in the United States is characterized by pronounced heterogeneity at the individual and state levels. Improving detection of transmission clusters through incorporation of whole-genome sequencing and identifying the drivers of this heterogeneity will be essential to reducing TB transmission.

FAST tuberculosis transmission control strategy speeds the start of tuberculosis treatment at a general hospital in Lima, Peru.

Objective:To evaluate the effect of the FAST (Find cases Actively, Separate safely, Treat effectively) strategy on time to tuberculosis diagnosis and treatment for patients at a general hospital in a tuberculosis-endemic setting.Design:Prospective cohort study with historical controls.Participants:Patients diagnosed with pulmonary tuberculosis during hospitalization at Hospital Nacional Hipolito Unanue in Lima, Peru.Methods:The FAST strategy was implemented from July 24, 2016, to December 31, 2019. We compared the proportion of patients with drug susceptibility testing and tuberculosis treatment during FAST to the 6-month period prior to FAST. Times to diagnosis and tuberculosis treatment were also compared using Kaplan-Meier plots and Cox regressions.Results:We analyzed 75 patients diagnosed with pulmonary tuberculosis through FAST. The historical cohort comprised 76 patients. More FAST patients underwent drug susceptibility testing (98.7% vs 57.8%; OR, 53.8; P < .001), which led to the diagnosis of drug-resistant tuberculosis in 18 (24.3%) of 74 of the prospective cohort and 4 (9%) of 44 of the historical cohort (OR, 3.2; P = .03). Overall, 55 FAST patients (73.3%) started tuberculosis treatment during hospitalization compared to 39 (51.3%) controls (OR, 2.44; P = .012). FAST reduced the time from hospital admission to the start of TB treatment (HR, 2.11; 95% CI, 1.39–3.21; P < .001).Conclusions:Using the FAST strategy improved the diagnosis of drug-resistant tuberculosis and the likelihood and speed of starting treatment among patients with pulmonary tuberculosis at a general hospital in a tuberculosis-endemic setting. In these settings, the FAST strategy should be considered to reduce tuberculosis transmission while simultaneously improving the quality of care.

'A double-edged sword': Perceived benefits and harms of active case-finding for people with presumptive tuberculosis and communities-A qualitative study based on expert interviews.

Active case-finding (ACF), also referred to as community-based tuberculosis screening, is a component of the World Health Organization's End TB Strategy. ACF has potential benefits but also harms, which need to be carefully assessed when developing and implementing ACF policies. While empirical evidence on the benefits of ACF is still weak, evidence on the harms is even weaker. This study aimed to explore experts' views on the benefits and harms of ACF for people with presumptive TB and communities. This was an exploratory study. Semi-structured interviews were conducted with a purposive sample of 39 experts from international, non-governmental/non-profit organizations, funders, government institutions, international societies, think tanks, universities and research institutions worldwide. Framework analysis was applied. Findings elaborated perceived benefits of ACF, including reaching vulnerable populations, reducing patient costs, helping raise awareness for tuberculosis among individuals and engaging communities, and reducing tuberculosis transmission. Perceived harms included increasing stigma and discrimination, causing false-positive diagnoses, as well as triggering other unintended consequences related to screening for tuberculosis patients, such as deportation of migrants once confirmed to have tuberculosis. Most of the perceived benefits of ACF could be linked to its objective of finding and treating persons with tuberculosis early (theme 1), while ACF was also perceived as a "double-edged sword" and could cause harms, if inappropriately designed and implemented (theme 2). The analysis underlined the importance of considering the benefits and harms of ACF throughout the screening pathway. The study provides new insights into the perceived benefits and harms of ACF from the perspectives of experts in the field. This study highlights gaps in the evidence base surrounding ACF and can stimulate further research, debate and analysis regarding the benefits and harms of ACF to inform contextual optimization of design and implementation of ACF strategies.

Clinical profiles of subclinical disease among pulmonary tuberculosis patients: a prospective cohort study in South Korea

BackgroundSubclinical tuberculosis (TB) is a potential target for public health intervention because its early identification may reduce TB transmission. We aimed to describe the clinical and laboratory findings of subclinical disease among pulmonary TB patients and compared treatment outcomes for subclinical and active diseases.MethodsIn this prospective cohort study, we enrolled adult patients aged ≥ 19 years with pulmonary TB between 2016 and 2018. Subclinical TB was defined as radiographic or microbiologic test results consistent with TB without clinical symptoms. We implemented a two-stage symptom assessment using a predefined TB symptom checklist. Demographic, clinical, and laboratory data were compared between subclinical and active diseases using multivariable binary logistic regression analysis. We evaluated treatment outcomes in the drug-susceptible cohort.ResultsAmong 420 enrolled patients, 81 (19.3%) had subclinical TB. Multivariable analysis showed that age < 65 years was the only variable significantly associated with subclinical disease. Subclinical disease had a significantly lower proportion of acid-fast bacilli smear and culture positivity and multiple lobe involvement compared to active disease. The white blood cell counts, platelet counts, and C-reactive protein levels were significantly higher among patients with active disease than among those with subclinical disease. Among 319 patients with treatment success in the drug-susceptible cohort, six (1.9%) recurrent cases were identified, and all were active disease. Patients with subclinical disease had a higher proportion of favourable outcomes; however, its odds ratio was insignificant.ConclusionsNearly one-fifth of tuberculosis cases were subclinical in South Korea. Despite its milder clinical presentation and lower level of inflammatory markers, the treatment outcomes of subclinical TB were not significantly different from that of active disease.

Opportunities from a new disease for an old threat: Extending COVID-19 efforts to address tuberculosis in South Africa.

The COVID-19 pandemic and phased nationwide lockdown have impacted negatively on individuals with tuberculosis (TB) and routine TB services. Through a literature review and the perspective of members of a national TB Think Tank task team, we describe the impact of the pandemic and lockdown on TB patients and services as well as the potential long-term setback to TB control in South Africa (SA). Strategies to mitigate risk and impact are explored, together with opportunities to leverage synergies from both diseases to the benefit of the National TB Programme (NTP). With the emergence of COVID-19, activities to address this new pandemic have been prioritised across all sectors. Within the health system, the health workforce and resources have been redirected away from routine services towards the new disease priority. The social determinants of health have deteriorated during the lockdown, potentially increasing progression to TB disease and impacting negatively on people with TB and their households, resulting in additional barriers to accessing TB care, with early reports of a decline in TB testing rates. Fewer TB diagnoses, less attention to adherence and support during TB treatment, poorer treatment outcomes and consequent increased transmission will increase the TB burden and TB-related mortality. People with TB or a history of TB are likely to be vulnerable to COVID-19. Modifications to current treatment practices are suggested to reduce visits to health facilities and minimise the risks of COVID-19 exposure. The COVID-19 pandemic has the potential to negatively impact on TB control in TB-endemic settings such as SA. However, there are COVID-19-related health systems-strengthening developments that may help the NTP mitigate the impact of the pandemic on TB control. By integrating TB case finding into the advanced screening, testing, tracing and monitoring systems established for COVID-19, TB case finding and linkage to care could increase, with many more TB patients starting treatment. Similarly, integrating knowledge and awareness of TB into the increased healthcare worker and community education on infectious respiratory diseases, behavioural practices around infection prevention and control, and cough etiquette, including destigmatisation of mask use, may contribute to reducing TB transmission. However, these potential gains could be overwhelmed by the impact of increasing poverty and other social determinants of health on the burden of TB.

CureTB and continuity of care for globally mobile patients.

BACKGROUND: In 2016, 3% of newly diagnosed patients with tuberculosis (TB) left the United States, of whom 24% moved to Mexico. Continuity of care for TB is important to ensure patients complete treatment and reduce TB transmission. CureTB provides continuity of care for patients with TB who move out of the United States by referring them for care at their destination.METHODS: Analysis of CureTB data collected between January 2012 to December 2015 to describe demographics and outcomes of referred patients and examine factors contributing to successful treatment outcomes.RESULTS: CureTB received 1347 referrals mostly from health departments and law enforcement agencies in the United States (92%). A total of 858 referrals were for patients with verified or possible TB (64%). Most patients moved to Mexico or other Latin American countries (96%) and completed treatment after departing (78%). Poor treatment outcomes were associated with being in custody (33%), not being interviewed by CureTB (30%), and not having diabetes (18%).CONCLUSION: CureTB successfully promoted transnational continuity of care for patients by exchanging information with international public health authorities and linking them directly with patients. This patient-centered strategy helps improve TB treatment success and reduce the global burden and transmission of TB.

Delayed care-seeking and its underlying factors among patients with tuberculosis in Yangon, Myanmar.

Tuberculosis (TB) remains a major public health problem in Myanmar. Early care-seeking behaviors play a significant role in reducing TB transmission and speeding recovery. This study was conducted to estimate the proportion of patients with TB who delayed care-seeking and to identify underlying factors. The study population included patients with TB treated in a TB diagnostic center in April 2015. A total of 346 patients were chosen as eligible respondents. The data were collected using structured questionnaires and face-to-face interviews. In addition to descriptive statistics, chi-squared test and multiple logistic regression were performed to show any associations. The study revealed that 66.8% of patients delayed care-seeking, and the average duration of delay was 21 days. Using the chi-squared test, factors such as education, occupation, family income, knowledge of TB, possessing information about TB, having a family member or close friend contract TB, travel distance, and cost causing a burden were significantly associated with delayed care-seeking (p < 0.05). Multiple logistic regression analysis found that 4 variables exhibited significant associations: low levels of education, occupation as government staff member, possessing information about TB, and having a family member or close friend contract TB (p < 0.05). The results from this study provide useful comprehensive information addressing underlying factors associated with delayed care-seeking behaviors. These can be used to advance health education interventions regarding TB and strengthen early diagnosis of TB within community settings.

Local Lung Immune Response to Mycobacterium bovis Challenge after BCG and M. bovis Heat-Inactivated Vaccination in European Badger (Meles meles).

Tuberculosis (TB) vaccination could be used as a key part of integrated strategies for the disease’s control if an effective and safe vaccine under field conditions is obtained. Recent studies in Spain have evaluated the protective efficacy of two oral vaccines against experimental challenge with live intra-bronchial Mycobacterium bovis in captive badgers: the live-attenuated M. bovis BCG vaccine (Danish strain) and a heat-inactivated M. bovis (HIMB) vaccine. With the objective of increasing the knowledge of the cellular development progress of infection and generating further tools to discriminate between mild and severe TB lesions between and within animals, the immunopathology of tuberculous lesions was studied to characterize the local immune response (cell type profile) within lung granulomas from control (non-vaccinated), BCG vaccinated and HIMB-vaccinated experimentally infected badgers with M. bovis. Four immunohistochemical protocols, for the specific detection of macrophages, T lymphocytes, B lymphocytes and plasma cells within TB granulomas in formalin fixed sections of the right middle lung lobe (lobe targeted for the M. bovis delivery), were performed. Immunolabelled sections were scanned and five randomly selected areas were analyzed with digital image analysis software. The results were expressed as the proportion of the positively immunolabelled area within the total area of the selected site. Data was analyzed using the statistical analysis software (SAS). In the three treatment groups, macrophages were the most abundant inflammatory cells within the granulomas, followed by B lymphocytes and plasma cells. T lymphocyes were absent in those granulomas. This would suggest a predominance of a non-specific innate response mediated by phagocytic cells over an adaptative humoral immune response. The proportion of macrophages and plasma cells was higher in BCG and HIMB-vaccinated badgers, respectively, suggesting the establishment of an adaptative humoral response in HIMB-vaccinated badgers. The lower bacterial load at the lung level, as well as the volume of lesions in lungs using magnetic resonance imaging in badgers with the HIMB vaccine in relation with local immune response presented, must be highlighted, since it would be an advantage in favor of its use under field conditions in terms of reducing TB transmission and environmental contamination.

The dynamics of tuberculosis transmission with optimal control analysis in Indonesia

This paper proposes the dynamics of tuberculosis (TB) transmission in Indonesia through a mathematical model. We determine the reproduction number and the equilibria. The parameters model is estimated based on TB data in Indonesia. We obtain the reproduction number of the TB model is R0 = 10.9635. This shows that eliminating TB in Indonesia requires more efforts. Thus, the optimal control strategy is performed to assess the effect of interventions in reducing TB transmission. We use three controls term in the form of prevention and two treatments. The simulation results indicate that the performance of three controls is the best strategy to reduce the spreading of TB disease among all strategies.