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  • Title: Rapid antigen detection and molecular tests for group A streptococcal infections for acute sore throat: systematic reviews and economic evaluation.
    Author: Fraser H, Gallacher D, Achana F, Court R, Taylor-Phillips S, Nduka C, Stinton C, Willans R, Gill P, Mistry H.
    Journal: Health Technol Assess; 2020 Jun; 24(31):1-232. PubMed ID: 32605705.
    Abstract:
    BACKGROUND: Sore throat is a common condition caused by an infection of the airway. Most cases are of a viral nature; however, a number of these infections may be caused by the group A Streptococcus bacterium. Most viral and bacterial sore throat infections resolve spontaneously within a few weeks. Point-of-care testing in primary care has been recognised as an emerging technology for aiding targeted antibiotic prescribing for sore throat in cases that do not spontaneously resolve. OBJECTIVE: Systematically review the evidence for 21 point-of-care tests for detecting group A Streptococcus bacteria and develop a de novo economic model to compare the cost-effectiveness of point-of-care tests alongside clinical scoring tools with the cost-effectiveness of clinical scoring tools alone for patients managed in primary care and hospital settings. DATA SOURCES: Multiple electronic databases were searched from inception to March 2019. The following databases were searched in November and December 2018 and searches were updated in March 2019: MEDLINE [via OvidSP (Health First, Rockledge, FL, USA)], MEDLINE In-Process & Other Non-Indexed Citations (via OvidSP), MEDLINE Epub Ahead of Print (via OvidSP), MEDLINE Daily Update (via OvidSP), EMBASE (via OvidSP), Cochrane Database of Systematic Reviews [via Wiley Online Library (John Wiley & Sons, Inc., Hoboken, NJ, USA)], Cochrane Central Register of Controlled Trials (CENTRAL) (via Wiley Online Library), Database of Abstracts of Reviews of Effects (DARE) (via Centre for Reviews and Dissemination), Health Technology Assessment database (via the Centre for Reviews and Dissemination), Science Citation Index and Conference Proceedings [via the Web of Science™ (Clarivate Analytics, Philadelphia, PA, USA)] and the PROSPERO International Prospective Register of Systematic Reviews (via the Centre for Reviews and Dissemination). REVIEW METHODS: Eligible studies included those of people aged ≥ 5 years presenting with sore throat symptoms, studies comparing point-of-care testing with antibiotic-prescribing decisions, studies of test accuracy and studies of cost-effectiveness. Quality assessment of eligible studies was undertaken. Meta-analysis of sensitivity and specificity was carried out for tests with sufficient data. A decision tree model estimated costs and quality-adjusted life-years from an NHS and Personal Social Services perspective. RESULTS: The searches identified 38 studies of clinical effectiveness and three studies of cost-effectiveness. Twenty-six full-text articles and abstracts reported on the test accuracy of point-of-care tests and/or clinical scores with biological culture as a reference standard. In the population of interest (patients with Centor/McIsaac scores of ≥ 3 points or FeverPAIN scores of ≥ 4 points), point estimates were 0.829 to 0.946 for sensitivity and 0.849 to 0.991 for specificity. There was considerable heterogeneity, even for studies using the same point-of-care test, suggesting that is unlikely that any single study will have accurately captured a test's true performance. There is some randomised controlled trial evidence to suggest that the use of rapid antigen detection tests may help to reduce antibiotic-prescribing rates. Sensitivity and specificity estimates for each test in each age group and care setting combination were obtained using meta-analyses where appropriate. Any apparent differences in test accuracy may not be attributable to the tests, and may have been caused by known differences in the studies, latent characteristics or chance. Fourteen of the 21 tests reviewed were included in the economic modelling, and these tests were not cost-effective within the current National Institute for Health and Care Excellence's cost-effectiveness thresholds. Uncertainties in the cost-effectiveness estimates included model parameter inputs and assumptions that increase the cost of testing, and the penalty for antibiotic overprescriptions. LIMITATIONS: No information was identified for the elderly population or pharmacy setting. It was not possible to identify which test is the most accurate owing to the paucity of evidence. CONCLUSIONS: The systematic review and the cost-effectiveness models identified uncertainties around the adoption of point-of-care tests in primary and secondary care settings. Although sensitivity and specificity estimates are promising, we have little information to establish the most accurate point-of-care test. Further research is needed to understand the test accuracy of point-of-care tests in the proposed NHS pathway and in comparable settings and patient groups. STUDY REGISTRATION: The protocol of the review is registered as PROSPERO CRD42018118653. FUNDING: This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 24, No. 31. See the NIHR Journals Library website for further project information. Sore throat is a common condition caused by an infection of the airway. Most cases are viral; however, a small number may be caused by the group A Streptococcus bacterium. Most viral and bacterial sore throat infections resolve spontaneously within a few weeks; however, some may be more serious and require antibiotics. Currently, National Institute for Health and Care Excellence guidance recommends the use of clinical scoring tools to identify patients for whom antibiotic treatment is appropriate. Ideally, a throat swab culture should be obtained to identify the organism causing the infection in cases in which diagnosis is uncertain. However, this takes time, causing potential delays in administering the correct treatment. Point-of-care tests can be administered at or near the site of the patient; therefore, they are much faster. Our review considered evidence for the test accuracy and cost-effectiveness of 21 point-of-care tests for detecting group A Streptococcus bacteria. We built an economic model, predicting costs and benefits for adults and children in a primary care or hospital setting. The findings will support the National Institute for Health and Care Excellence to make recommendations about the use of these point-of-care tests for detecting group A Streptococcus bacteria in the NHS in England and Wales. The clinical effectiveness review found 38 relevant studies; of these, 26 reported on the accuracy of point-of-care tests. These studies found wide variation in the accuracy of the tests. The quality of the evidence was weak and there was little information on some of the 21 tests. As the studies were all so different, it was not possible to identify which test is the most accurate. The economic model found considerable uncertainty about how costs and benefits would change if point-of-care tests were introduced in different care settings. Further research is needed to see whether or not point-of-care testing provides value for money.
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