Optimal allocation of limited test resources for the quantification of COVID-19 infections.

The systematic identification of infected individuals is critical for the containment of the COVID-19 pandemic. Currently, the spread of the disease is mostly quantified by the reported numbers of infections, hospitalisations, recoveries and deaths; these quantities inform epidemiology models that provide forecasts for the spread of the epidemic and guide policy making. The veracity of these forecasts depends on the discrepancy between the numbers of reported, and unreported yet infectious, individuals. We combine Bayesian experimental design with an epidemiology model and propose a methodology for the optimal allocation of limited testing resources in space and time, which maximises the information gain for such unreported infections. The proposed approach is applicable at the onset and spread of the epidemic and can forewarn of a possible recurrence of the disease after relaxation of interventions. We examine its application in Switzerland; the open source software is, however, readily adaptable to countries around the world. We find that following the proposed methodology can lead to vastly less uncertain predictions for the spread of the disease, thus improving estimates of the effective reproduction number and the future number of unreported infections. This information can provide timely and systematic guidance for the effective identification of infectious individuals and for decision-making regarding lockdown measures and the distribution of vaccines.

Patient's travel distance to specialised cancer diagnostics and the association with the general practitioner's diagnostic strategy and satisfaction with the access to diagnostic procedures: an observational study in Denmark.

BACKGROUND: Research indicate that when general practitioners (GPs) refer their patients for specialist care, the patient often has long distance. This study had a twofold aim: in accordance to the GP's suspicion of cancer, we investigated the association between: 1) cancer patient's travel distance to the first specialised diagnostic facility and the GP's diagnostic strategy and 2) cancer patient's travel distance to the first specialised diagnostic facility and satisfaction with the waiting time and the availability of diagnostic investigations. METHOD: This combined questionnaire- and registry-based study included incident cancer patients diagnosed in the last 6 months of 2016 where the GP had been involved in the diagnostic process of the patients prior to their diagnosis of cancer (n = 3455). The patient's travel distance to the first specialised diagnostic facility was calculated by ArcGIS Network Analyst. The diagnostic strategy, cancer suspicion and the GP's satisfaction with the waiting times and the available investigations were assessed from GP questionnaires. RESULTS: When the GP did not suspect cancer or serious illness, an insignificant tendency was seen that longer travel distance to the first specialised diagnostic facility increased the likelihood of the GP using 'wait-and-see' approach and 'medical treatment' as diagnostic strategies. The GPs of patients with travel distance longer than 49 km to the first specialised diagnostic facility were more likely to report dissatisfaction with the waiting time for requested diagnostic investigations (PR: 1.98, 95% CI: 1.20-3.28). CONCLUSION: A insignificant tendency to use 'wait-and-see' and 'medical treatment' were seen among GPs of patients with long travel distance to the first diagnostic facility when the GP did not suspect cancer or serious illness. Long distance was associated with higher probability of GP dissatisfaction with the waiting time for diagnostic investigations.

Performance of health laboratories in provision of HIV diagnostic and supportive services in selected districts of Tanzania.

BACKGROUND: Roll-out and implementation of antiretroviral therapy (ART) necessitated many countries in Sub-Saharan Africa to strengthen their national health laboratory systems (NHLSs) to provide high quality HIV diagnostic and supportive services. This study was conducted to assess the performance of health laboratories in provision of HIV diagnostic and supportive services in eight districts (from four regions of Iringa, Mtwara, Tabora and Tanga), after nine years of implementation of HIV/AIDS care and treatment plan in Tanzania. METHODS: In this cross-sectional study, checklists and observations were utilized to collect information from health facilities (HFs) with care and treatment centres (CTCs) for HIV/AIDS patients; on availability of laboratories, CTCs, laboratory personnel, equipment and reagents. A checklist was also used to collect information on implementation of quality assurance (QA) systems at all levels of the NHLS in the study areas. RESULTS: The four regions had 354 HFs (13 hospitals, 41 Health Centres (HCs) and 300 dispensaries); whereby all hospitals had laboratories and 11 had CTCs while 97.5 and 61.0% of HCs had both laboratories and CTCs, respectively. Of the dispensaries, 36.0 and 15.0% had laboratories and CTCs (mainly in urban areas). Thirty nine HFs (12 hospitals, 21 HCs and six dispensaries) were assessed and 56.4% were located in urban areas. The assessed HFs had 199 laboratory staff of different cadres (laboratory assistants = 35.7%; technicians =32.7%; attendants = 22.6%; and others = 9.1%); with >61% of the staff and 72.3% of the technicians working in urban areas. All laboratories were using rapid diagnostic tests for HIV testing. Over 74% of the laboratories were performing internal quality control and 51.4% were participating in external QA programmes. Regional and district laboratories had all key equipment and harmonization was maintained for Fluorescence-Activated Cell Sorting (FACS) machines. Most of the biochemical (58.0%) and haematological analysers (74.1%) were available in urban areas. Although >81% of the equipment were functional with no mechanical faulty, 62.6% had not been serviced in the past three years. CONCLUSION: Diagnostic and supportive services for HIV were available in most of the HCs and hospitals while few dispensaries were providing the services. Due to limitations such as shortage of staff, serving of equipment and participation in QA programmes, the NHLS should be strengthened to ensure adequate human resource, implementation of QA and sustainable preventive maintenance services of equipment.

Prenatal diagnostic services in three regional centers in Vietnam.

OBJECTIVES: This study aims to give information on the prenatal diagnostic (PND) services provided in three major regional PND centers in Vietnam. METHODS: This cross-sectional study was conducted in early 2014. An inventory of services, human resources, facilities, and equipment and in-depth interviews were carried out. RESULTS: Three regional PND centers were set up between 2007 and 2014, and technical guidelines on PND tests were released by the Ministry of Health in 2010. There were a variety of services among centers, and the number of services provided by the three PND centers was far below the target set by the Ministry of Health. There is still limited capacity of human resources, facilities, and equipment in PND centers. Different measures were implemented by hospitals to improve capacity, including counseling. CONCLUSIONS: Despite a late start, with government support, PND services in Vietnam have developed quickly. However, to reach the objectives of 15 % of women receiving PND services by 2015 and 50 % by 2020, several actions should be taken to expand the service coverage and capacity of centers.

Commercialisation of Biomarker Tests for Mental Illnesses: Advances and Obstacles.

Substantial strides have been made in the field of biomarker research for mental illnesses over the past few decades. However, no US FDA-cleared blood-based biomarker tests have been translated into routine clinical practice. Here, we review the challenges associated with commercialisation of research findings and discuss how these challenges can impede scientific impact and progress. Overall evidence indicates that a lack of research funding and poor reproducibility of findings were the most important obstacles to commercialization of biomarker tests. Fraud, pre-analytical and analytical limitations, and inappropriate statistical analysis are major contributors to poor reproducibility. Increasingly, these issues are acknowledged and actions are being taken to improve data validity, raising the hope that robust biomarker tests will become available in the foreseeable future.

An Appeal to the Global Health Community for a Tripartite Innovation: An "Essential Diagnostics List," "Health in All Policies," and "See-Through 21(st) Century Science and Ethics".

Diagnostics spanning a wide range of new biotechnologies, including proteomics, metabolomics, and nanotechnology, are emerging as companion tests to innovative medicines. In this Opinion, we present the rationale for promulgating an "Essential Diagnostics List." Additionally, we explain the ways in which adopting a vision for "Health in All Policies" could link essential diagnostics with robust and timely societal outcomes such as sustainable development, human rights, gender parity, and alleviation of poverty. We do so in three ways. First, we propose the need for a new, "see through" taxonomy for knowledge-based innovation as we transition from the material industries (e.g., textiles, plastic, cement, glass) dominant in the 20(th) century to the anticipated knowledge industry of the 21st century. If knowledge is the currency of the present century, then it is sensible to adopt an approach that thoroughly examines scientific knowledge, starting with the production aims, methods, quality, distribution, access, and the ends it purports to serve. Second, we explain that this knowledge trajectory focus on innovation is crucial and applicable across all sectors, including public, private, or public-private partnerships, as it underscores the fact that scientific knowledge is a co-product of technology, human values, and social systems. By making the value systems embedded in scientific design and knowledge co-production transparent, we all stand to benefit from sustainable and transparent science. Third, we appeal to the global health community to consider the necessary qualities of good governance for 21st century organizations that will embark on developing essential diagnostics. These have importance not only for science and knowledge-based innovation, but also for the ways in which we can build open, healthy, and peaceful civil societies today and for future generations.

Emergency care and referral among isolated island populations in the Bahamas.

BACKGROUND: Isolated island populations face unique health challenges. In the Bahamas, the islands of Mayaguana, Inagua, Crooked Island, Acklins, and Long Cay-referred to as the MICAL Constituency-are among the most isolated. OBJECTIVES: Our objective was to better understand regional emergency care needs and capabilities, and determine how emergency care can be optimized among island populations. METHODS: During the summer of 2013, the project team conducted semi-structured key-informant interviews and small-group discussions among all health care teams in the MICAL region, as well as a community-based household survey on the island of Mayaguana. The interviews and small-group discussions consisted of open-response questions related to health care services, equipment, supplies, medications, and human resources. The community-based survey examined the prevalence of chronic noncommunicable diseases (CNCDs) and associated risk factors affecting the inhabitants of the region. RESULTS: The average number of annual emergency referrals from each of the MICAL islands was approximately 25-30, and reasons for referrals off-island included chest pain, abdominal pain, trauma, and dysfunctional uterine bleeding. Traditional prehospital care is not established in the MICAL Constituency. Providers reported feelings of isolation from the distant health system in Nassau. Whereas most clinics have a well-stocked pharmacy of oral medications, diagnostic capabilities are limited. The household survey showed a high prevalence of CNCDs and associated risk factors. CONCLUSION: Ongoing in-service emergency care training among MICAL providers is needed. Additional equipment could significantly improve emergency care capabilities, specifically, equipment to manage chest pain, fractures, and other trauma. Community-based preventive services and education could improve the overall health of the island populations.

Guidelines for designing a digestive disease endoscopy unit: report of the World Endoscopy Organization.

A dedicated digestive disease endoscopy unit is structurally and functionally differentiating rapidly as a result of increasing diagnostic and therapeutic possibilities in the last 10-20 years. Publications with practical details are scarce, imposing a challenge in the construction of such a unit. The lack of authoritative information about endoscopy unit design means that architects produce their own design with or without consulting endoscopists working in such a unit. A working group of the World Endoscopy Organization discussed and outlined a practical approach fordesign and construction of a modern endoscopy unit. Designing the layout is extremely important, necessitating thoughtful planning to provide comfort to the endoscopy staff and patients, and efficient data archiving and transmission during endoscopic services.

Home-based HIV voluntary counselling and testing (VCT) for improving uptake of HIV testing.

BACKGROUND: The low uptake of HIV voluntary counselling and testing (VCT) has hindered global attempts to prevent new HIV infections and has limited scale-up of HIV care and treatment. Globally, only 10% of HIV-infected individuals are aware of their HIV status. One approach to increase uptake is home-based HIV VCT, which may be effective in increasing the number of patients on treatment and preventing new infections. OBJECTIVES: To establish the effect of home-based HIV VCT on uptake of HIV testing SEARCH STRATEGY: We searched MEDLINE (February 2007), EMBASE (February 2007), CENTRAL (February 2007), AIDSearch (February 2007), LILACS, CINAHL and Sociofile. We also contacted relevant researchers. The original review search strategy was updated in 2008. SELECTION CRITERIA: Randomised controlled trials comparing home-based HIV VCT with other testing models DATA COLLECTION AND ANALYSIS: Two review authors independently selected studies, assessed methodological quality, and extracted data. We planned to conduct statistical analysis using the Review Manager software and calculate summary statistics (relative risks (RRs) with 95% confidence intervals (CI)) for primary outcomes. MAIN RESULTS: Only one study from developing countries met the inclusion criteria and was included in the review. The study, a cluster randomised trial (10 clusters, n=849) compared VCT uptake between an optional location (including home-based) and a local clinic location in a population-based HIV survey. The study showed a higher uptake of VCT among participants in the optional-location group. Uptake was significantly greater in the optional-location group in those who were pre-test counselled only (RR=4.6; 95% CI 3.58 to 5.91); pretest counselled and tested (RR=4.6; 95% CI 3.51 to 5.92); and post-test counselled and received the test result (RR=4.8; 95% CI 3.62 to 6.21). This study, however, had significant methodological problems limiting further analysis and interpretation. AUTHORS' CONCLUSIONS: Although home-based HIV VCT has the potential to enhance VCT uptake in developing countries, insufficient data exist to recommend large-scale implementation of home-based HIV testing. Further studies are needed to determine if home-based VCT is better than facility-based VCT in improving VCT uptake.

A randomized controlled trial to evaluate the relative efficacy of adding voluntary counseling and testing (VCT) to information dissemination in reducing HIV-related risk behaviors among Hong Kong male cross-border truck drivers.

Mobile populations are vulnerable to contracting HIV. The present study aims to evaluate the relative efficacy of the voluntary counseling and testing plus information dissemination (VCT-ID) approach versus the information dissemination (ID) approach for promoting HIV preventive behaviors in a mobile population, cross-border truck drivers. A total of 301 adult male cross-border truck drivers who self-reported having had sex with female sex workers (FSW) or non-regular sex partners (NRPs) in mainland China in the last 12 months were recruited and randomized into the VCT-ID intervention group (Group I) or ID control group (Group C). Anonymous structured questionnaires, administered through a computer-assisted method, were used to collect data. At the follow-up survey (about 8-9 weeks since the baseline survey), Group I participants, as compared to Group C participants, were more likely to be consistent condom users when having sex with FSW (85.5% versus 68.5%, p<0.05) and with NRP (54.8% versus 36.4%, p<0.1), more knowledgeable about HIV, and were less likely to have contracted sexually transmitted diseases (STD) in the last two months. The VCT-ID approach is shown to be more efficacious than the ID approach in promoting safer sex and HIV-related knowledge among local cross-border truck drivers. Feasibility of providing voluntary counseling and testing (VCT) services at locations which are convenient to the target population is demonstrated. It also shows that VCT services can be used as a means of HIV prevention. The findings of this study resulted in up-scaled VCT services for the local target population.

Health laboratories in the Tanga region of Tanzania: the quality of diagnostic services for malaria and other communicable diseases.

Although critical for good case management and the monitoring of health interventions, the health-laboratory services in sub-Saharan Africa are grossly compromised by poor infrastructures and a lack of trained personnel, essential reagents and other supplies. The availability and quality of diagnostic services in 37 health laboratories in three districts of the Tanga region of Tanzania have recently been assessed. The results of the survey, which involved interviews with health workers, observations and a documentary review, revealed that malaria accounted for >50% of admissions and out-patient visits. Most (92%) of the laboratories were carrying out malaria diagnosis and 89% were measuring haemoglobin concentrations but only one (3%) was conducting culture and sensitivity tests, and those only on urine and pus samples. Only 14 (17%) of the 84 people found working in the visited laboratories were laboratory technologists with a diploma certificate or higher qualification. Sixteen (43%) of the study laboratories each had five or fewer types of equipment and only seven (19%) had more than 11 types each. Although 11 (30%) of the laboratories reported that they conducted internal quality control, none had standard operating procedures (SOP) on display or evidence of such quality assurance. Although malaria was the main health problem, diagnostic services for malaria and other diseases were inadequate and of poor quality because of the limited human resources, poor equipment and shortage of supplies. If the health services in Tanga are not to be overwhelmed by the progressively increasing burden of HIV/AIDS, malaria, tuberculosis and other emerging and re-emerging diseases, more funding and appropriate policies to improve the availability and quality of the area's diagnostic services will clearly be required.

Expansion of HIV laboratory diagnostic services in Chennai, India 2001-2006: is the growth commensurate with the need?

OBJECTIVE: To describe the changes in HIV services provided and the patient population utilizing voluntary counseling and testing (VCT) services at private testing laboratories in Chennai, India in 2001 and 2006. METHODS: In 2001, a cross-sectional descriptive survey was conducted to assess the services provided and client population of 1,031 private laboratories. A subset of labs (9%) that had been surveyed in 2001 were also studied in 2006. RESULTS: In 2001, significantly more high volume labs (>10 HIV tests per month) offered HIV diagnostic tests than low volume labs (<10 HIV test per month) (p<0.001). More high volume labs (20.0%) provided pre-test counseling as part of HIV testing than low volume labs (11.1%) (p = 0.003). Between 2001 and 2006, the number of labs that provided HIV diagnostic tests significantly increased, including ELISA (87.8% vs. 40.0%), Western Blot (84.4% vs. 13.3%), and Tridot (98.9% vs. 72.2%) (p<0.001). Also the number of labs that reported greater than 10 women seeking HIV testing per month significantly increased from 14.5% to 79.0% (p = 0.006). More labs provided pre-test counseling in 2006 (34.4%) than in 2001 (21.1%) (p = 0.046). CONCLUSIONS: Though HIV diagnostic testing services have increasingly become available, counseling services have not expanded commensurately. Further outreach and education is necessary to expand comprehensive HIV VCT services in both urban and rural India.

The profit potential of hospital labs.

Up to 90 percent of American hospitals have some type of laboratory outreach program, performing a test here or there for affiliated doctors in a nearby clinic. But a few hospitals have found that a more aggressive outreach program, with a relatively modest investment, can turn a cost center into a reliable profit center.

Access to diagnostics in support of HIV/AIDS and tuberculosis treatment in developing countries.

Access to necessary diagnostic tests in support of HIV/AIDS and tuberculosis treatment, such as CD4 cell counts, viral load, tuberculosis culture, and susceptibility testing, has significantly lagged the provision of drug therapy in developing countries. This is an outcome of the fundamental limitations in overall access to basic health services in the developing world, particularly in sub-Saharan Africa. Among health services, laboratory capacity and access are particularly deficient, and often non-existent in rural settings. As such, treatment is commonly administered in the absence of diagnostic testing, potentially accelerating the incidence of drug-related toxicity and the onset of drug resistance if therapy results in incomplete viral suppression. Factors constraining the expansion of necessary diagnostic testing include a severe shortage of qualified laboratory personnel, limited access to training for specific diagnostic tests, and a lack of national standards and systems for laboratory accreditation, proficiency testing, quality control and logistics. Additional factors include insufficient funding for improvements in laboratory services, limited availability of technical support, and the cost of diagnostic instrumentation and consumables. As a result, laboratory tests that are routine and expected in the industrialized world are often not performed in developing countries, despite the massive scale-up in treatment access for HIV/AIDS. This results in unintended consequences such as higher levels of mortality among patients who have not been properly diagnosed, additional costs for providing ART to patients who may not yet require drug therapy, and earlier onset of resistance to first-line therapies among patients predisposed to drug resistance.