scholarly journals Re‐reading of OraQuick HIV ‐1/2 rapid antibody test results: quality assurance implications for HIV self‐testing programmes

2019 ◽  
Vol 22 (S1) ◽  
pp. e25234 ◽  
Author(s):  
Victoria Watson ◽  
Russell J Dacombe ◽  
Christopher Williams ◽  
Thomas Edwards ◽  
Emily R Adams ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Antibody Test ◽  
Test Results ◽  
Self Testing ◽  
Hiv 1 ◽  
Rapid Antibody

scholarly journals Behavioural responses to SARS-CoV-2 antibody testing in England: REACT-2 study

2021 ◽  
Vol 6 ◽  
pp. 203
Author(s):  
Rozlyn Redd ◽  
Emily Cooper ◽  
Christina Atchison ◽  
Isabella Pereira ◽  
Polly Hollings ◽  
...  
Keyword(s):  
Research Programme ◽  
Antibody Test ◽  
Test Results ◽  
Antibody Testing ◽  
Community Based ◽  
Prevalence Studies ◽  
Behavioural Responses ◽  
Self Testing ◽  
Community Transmission

Background:  This study assesses the behavioural responses to SARS-CoV-2 antibody test results as part of the REal-time Assessment of Community Transmission-2 (REACT-2) research programme, a large community-based surveillance study of antibody prevalence in England. Methods: A follow-up survey was conducted six weeks after the SARS-CoV-2 antibody test. The follow-up survey included 4500 people with a positive result and 4039 with a negative result. Reported changes in behaviour were assessed using difference-in-differences models. A nested interview study was conducted with 40 people to explore how they thought through their behavioural decisions. Results: While respondents reduced their protective behaviours over the six weeks, we did not find evidence that positive test results changed participant behaviour trajectories in relation to the number of contacts the respondents had, for leaving the house to go to work, or for leaving the house to socialise in a personal place. The qualitative findings supported these results. Most people did not think that they had changed their behaviours because of their test results, however they did allude to some changes in their attitudes and perceptions around risk, susceptibility, and potential severity of symptoms. Conclusions: We found limited evidence that knowing your antibody status leads to behaviour change in the context of a research study. While this finding should not be generalised to widespread self-testing in other contexts, it is reassuring given the importance of large prevalence studies, and the practicalities of doing these at scale using self-testing with lateral flow immunoassay (LFIA).

scholarly journals Comparison of Rapid Antibody Test and Thorax Computed Tomography Results in Patients who Underwent RT-PCR with the Pre-Diagnosis of COVID-19

2021 ◽  
Author(s):  
İlker Kızıloglu ◽  
Aslı Şener ◽  
Neslihan Siliv
Keyword(s):  
Computed Tomography ◽  
Emergency Department ◽  
Predictive Value ◽  
Antibody Test ◽  
Nasopharyngeal Swab ◽  
Test Results ◽  
Rt Pcr ◽  
Hospital Data ◽  
Thorax Ct ◽  
Rapid Antibody

Introduction: In this study, it is planned to compare the RT-PCR test, which is the gold standard in the diagnosis of COVID-19, with Thorax computed tomography (CT) and rapid antibody test results. Methods: Patients who were admitted to the emergency service of İzmir Çiğli Training and Research Hospital between 01.04.2020 and 31.05.2020 and who were suspected of having COVID-19 infection were included in the study. The medical records of the patients were retrospectively analyzed through the hospital data processing database. Age, gender, hospitalization, status of home quarantine, real-time reverse transcription-polymerase chain reaction (RT-PCR), thorax CT and rapid antibody test results of the patients were examined. The relationship between RT-PCR, thorax CT and rapid antibody test results were compared statistically. Results: A total of 181 patients, 115 (63.5%) male and 66 (36.5%) female, with an average age of 56.4 ± 18.06 years were included in the study. The nasopharyngeal swab PCR result obtained at the first admission of the patients to the emergency department was positive in 71 (39.2%) patients. Thorax CT was performed in 173 (95.6%) patients who applied to the emergency department, and 112 (64.7%) of them had findings that could be compatible with COVID-19. According to the thorax CT findings in patients, sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) for detecting COVID-19 infection were respectively; 76.1%, 43.1%, 48.2% and 72.1% (ĸ: 0.176, p <0.001). In our study, the mortality rate for COVID-19 was found to be 2.8%. Conclusion: Rapid antibody test and thorax CT examinations were found to have low diagnostic value in patients who admitted to the emergency department of our hospital and whose first RT-PCR SARS-CoV-2 test was positive. Studies involving larger patient groups are needed for their use alone in diagnosis and screening.

scholarly journals Behavioural responses to SARS-CoV-2 antibody testing in England: REACT-2 study

2021 ◽  
Vol 6 ◽  
pp. 203
Author(s):  
Rozlyn Redd ◽  
Emily Cooper ◽  
Christina Atchison ◽  
Isabella Pereira ◽  
Polly Hollings ◽  
...  
Keyword(s):  
Research Programme ◽  
Antibody Test ◽  
Test Results ◽  
Antibody Testing ◽  
Community Based ◽  
Prevalence Studies ◽  
Behavioural Responses ◽  
Self Testing ◽  
Community Transmission

Background:  This study assesses the behavioural responses to SARS-CoV-2 antibody test results as part of the REal-time Assessment of Community Transmission-2 (REACT-2) research programme, a large community-based surveillance study of antibody prevalence in England. Methods: A follow-up survey was conducted six weeks after the SARS-CoV-2 antibody test. The follow-up survey included 4500 people with a positive result and 4039 with a negative result. Reported changes in behaviour were assessed using difference-in-differences models. A nested interview study was conducted with 40 people to explore how they thought through their behavioural decisions. Results: While respondents reduced their protective behaviours over the six weeks, we did not find evidence that positive test results changed participant behaviour trajectories in relation to the number of contacts the respondents had, for leaving the house to go to work, or for leaving the house to socialise in a personal place. The qualitative findings supported these results. Most people did not think that they had changed their behaviours because of their test results, however they did allude to some changes in their attitudes and perceptions around risk, susceptibility, and potential severity of symptoms. Conclusions: We found limited evidence that knowing your antibody status leads to behaviour change in the context of a research study. While this finding should not be generalised to widespread self-testing in other contexts, it is reassuring given the importance of large prevalence studies, and the practicalities of doing these at scale using self-testing with lateral flow immunoassay (LFIA).

scholarly journals High prevalence of symptoms among Brazilian subjects with antibodies against SARS-CoV-2: a nationwide household survey

2020 ◽  
Author(s):  
Ana Maria Baptista Menezes ◽  
Cesar G Victora ◽  
Fernando P Hartwig ◽  
Mariangela F Silveira ◽  
Bernardo L Horta ◽  
...  
Keyword(s):  
Recursive Partitioning ◽  
Indirect Evidence ◽  
Household Survey ◽  
Antibody Test ◽  
Demographic Characteristics ◽  
Test Results ◽  
High Prevalence ◽  
Using Data ◽  
Test Result ◽  
Rapid Antibody

Since the beginning of the pandemic of COVID-19, there has been a widespread assumption that most infected persons are asymptomatic. A frequently-cited early study from China suggested that 86% of all infections were undocumented, which was used as indirect evidence that patients were asymptomatic. Using data from the most recent wave of the EPICOVID19 study, a nationwide household-based survey including 133 cities from all states of Brazil, we estimated the proportion of people with and without antibodies for SARS-CoV-2 who were asymptomatic, which symptoms were most frequently reported, the number of symptoms reported and the association between symptomatology and socio-demographic characteristics. We were able to test 33,205 subjects using a rapid antibody test that was previously validated. Information on symptoms was collected before participants received the test result. Out of 849 (2.7%) participants who tested positive for SARS-CoV-2 antibodies, only 12.1% (95%CI 10.1-14.5) reported no symptoms since the start of the pandemic, compared to 42.2% (95%CI 41.7-42.8) among those who tested negative. The largest difference between the two groups was observed for changes in smell or taste (56.5% versus 9.1%, a 6.2-fold difference). Symptoms change in smell or taste, fever and myalgia were most likely to predict positive test results as suggested by recursive partitioning tree analysis. Among individuals without any of these three symptoms (74.2% of the sample), only 0.8% tested positive, compared to 18.3% of those with both fever and changes in smell or taste. Most subjects with antibodies against SARS-CoV-2 in Brazil are symptomatic, even though most present only mild symptoms.

How to interpret borderline HCV antibody test results? A comparative study investigating four different anti-HCV assays

2013 ◽  
Vol 51 (01) ◽  
Author(s):  
B Maasoumy ◽  
B Bremer ◽  
R Raupach ◽  
P Lehmann ◽  
MP Manns ◽  
...  
Keyword(s):  
Comparative Study ◽  
Antibody Test ◽  
Test Results ◽  
Hcv Antibody

scholarly journals Rapid point-of-care (POC) testing for Hepatitis C antibodies in a very high prevalence setting: persons injecting drugs in Tallinn, Estonia

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Anneli Uusküla ◽  
Ave Talu ◽  
Jürgen Rannap ◽  
David M. Barnes ◽  
Don Des Jarlais
Keyword(s):  
Hepatitis C ◽  
Point Of Care ◽  
Antibody Test ◽  
Hcv Rna ◽  
Test Results ◽  
Blood Draw ◽  
Persons Who Inject Drugs ◽  
Oral Swab ◽  
High Prevalence ◽  
Hcv Antibody

Abstract Background Between December 2018 and January of 2019, we evaluated the accuracy of the point-of-care Hepatitis C (HCV) antibody test (POC; OraQuick HCV) used at a community-based needle and syringe exchange program serving persons who inject drugs in Tallinn, Estonia. Methods We compared the results of screening for HCV antibodies by OraQuick (oral swab) and enzyme immunoassay (EIA; blood draw) and assessed test results implications in a high prevalence setting. Findings Of the 100 participants, 88 (88%) had reactive POC test results, and 93 were HCV antibody positive on EIA testing. Sensitivity, specificity and negative predictive value (NPV) for the POC assay with EIA as the relevant reference test were as follows: 94.6% (95% CI 90.0–99.2%), 100% and 58.3% (95% CI 30.4–86.2%). Of the 12 testing, HCV-negative with the POC only 7 (58.3%) were true negatives. Conclusions Oral swab rapid testing HCV screening in this nonclinical setting was sensitive and specific but had unacceptably low NPV. In high prevalence settings, POC tests with high sensitivity and that directly measure HCV RNA may be warranted.

A Nationwide Survey of COVID-19 Testing in LGBTQ+ Populations in the United States

2021 ◽  
pp. 003335492110181
Author(s):  
Richard J. Martino ◽  
Kristen D. Krause ◽  
Marybec Griffin ◽  
Caleb LoSchiavo ◽  
Camilla Comer-Carruthers ◽  
...  
Keyword(s):  
United States ◽  
Gay Men ◽  
Antibody Test ◽  
Nationwide Survey ◽  
The United States ◽  
Sociodemographic Characteristics ◽  
Full Time ◽  
Test Results ◽  
Antibody Testing ◽  
And Gender

Objectives Lesbian, gay, bisexual, transgender, or queer and questioning (LGBTQ+) people and populations face myriad health disparities that are likely to be evident during the COVID-19 pandemic. The objectives of our study were to describe patterns of COVID-19 testing among LGBTQ+ people and to differentiate rates of COVID-19 testing and test results by sociodemographic characteristics. Methods Participants residing in the United States and US territories (N = 1090) aged ≥18 completed an internet-based survey from May through July 2020 that assessed COVID-19 testing and test results and sociodemographic characteristics, including sexual orientation and gender identity (SOGI). We analyzed data on receipt and results of polymerase chain reaction (PCR) and antibody testing for SARS-CoV-2 and symptoms of COVID-19 in relation to sociodemographic characteristics. Results Of the 1090 participants, 182 (16.7%) received a PCR test; of these, 16 (8.8%) had a positive test result. Of the 124 (11.4%) who received an antibody test, 45 (36.3%) had antibodies. Rates of PCR testing were higher among participants who were non–US-born (25.4%) versus US-born (16.3%) and employed full-time or part-time (18.5%) versus unemployed (10.8%). Antibody testing rates were higher among gay cisgender men (17.2%) versus other SOGI groups, non–US-born (25.4%) versus US-born participants, employed (12.6%) versus unemployed participants, and participants residing in the Northeast (20.0%) versus other regions. Among SOGI groups with sufficient cell sizes (n > 10), positive PCR results were highest among cisgender gay men (16.1%). Conclusions The differential patterns of testing and positivity, particularly among gay men in our sample, confirm the need to create COVID-19 public health messaging and programming that attend to the LGBTQ+ population.

scholarly journals Development of a Web-Based Query Tool for Quality Assurance of Clinical Molecular Genetic Test Results

2007 ◽  
Vol 9 (1) ◽  
pp. 95-98 ◽  
Author(s):  
Matthew J. McGinniss ◽  
Rebecca Chen ◽  
Victoria M. Pratt ◽  
Arlene Buller ◽  
Franklin Quan ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Genetic Test ◽  
Molecular Genetic ◽  
Test Results ◽  
Web Based ◽  
Genetic Test Results ◽  
Query Tool ◽  
Molecular Genetic Test
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