Corpus overview


Overview

MeSH Disease

Human Phenotype

Transmission

Seroprevalence
    displaying 1 - 10 records in total 45
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    Performance SERO of a point of care test for detecting IgM and IgG antibodies SERO against SARS-CoV-2 and seroprevalence SERO in blood SERO donors and health care workers in Panama

    Authors: Alcibiades Villarreal; Giselle Rangel; Xu Zhang; Digna Wong; Carolina De La Guardia; Gabrielle Britton; Patricia Llanes; Carlos M Restrepo; Ambar Perez; Diana Oviedo; Maria B Carreira; Gilberto Skildsen; Dilcia Sambrano; Yamitzel Zaldivar; Danilo Franco; Sandra Lopez Verges; Dexi Zhang; Fanjing Fan; Baojun Wang; Xavier Saez Llorens; Rodrigo DeAntonio; Ivonne Torres-Atencio; Eduardo Ortega-Barria; Rao Kosagisharaf; Ricardo Lleonart; Li Chong; Amador Goodridge; - COVID-19 SEROLOGY COLLABORATOR GROUP

    doi:10.1101/2020.09.25.20201459 Date: 2020-09-25 Source: medRxiv

    Novel severe acute respiratory syndrome coronavirus 2 MESHD (SARS-CoV-2) is the etiologic agent of the ongoing coronavirus disease MESHD 2019 (COVID-19) pandemic, which has reached 28 million cases worldwide in eight months. The serological detection of antibodies SERO against the virus will play a pivotal role in complementing molecular tests to improve diagnostic accuracy, contact tracing TRANS, vaccine efficacy testing and seroprevalence SERO surveillance. Here, we aimed first to evaluate a lateral flow assay ability to identify specific IgM and IgG antibodies SERO against SARS-CoV-2 and second, to report the seroprevalence SERO of these antibodies SERO among health care workers and healthy volunteer blood SERO donors in Panama. We recruited study participants between April 30th and July 7th, 2020. For the test validation and performance SERO evaluation, we analyzed serum samples SERO from participants with clinical symptoms and confirmed positive RT-PCR for SARS-CoV-2, participants with other confirmed infectious diseases MESHD, and a set of pre-pandemic serum samples SERO. We used two by two table analysis to determine the test sensitivity SERO and specificity as well as the kappa agreement value with a 95% confidence interval. Then, we used the lateral flow assay to determine seroprevalence SERO among serum samples SERO from COVID-19 patients, potentially exposed health care workers, and healthy volunteer donors. Our results show this assay reached a positive percent agreement of 97.2% (95% CI 84.2-100.0%) for detecting both IgM and IgG. The assay showed a kappa of 0.898 (95%CI 0.811- 0.985) and 0.918 (95% CI 0.839-0.997) for IgM and IgG, respectively. The evaluation of serum samples SERO from hospitalized COVID-19 patients indicates a correlation between test sensitivity SERO and the number of days since symptom onset TRANS; the highest positive percent agreement (87% (95% CI 67.0-96.3%)) was observed at [≥]15 days post- symptom onset TRANS. We found an overall antibody SERO seroprevalence SERO of 11.6% (95% CI 8.5-15.8%) among both health care workers and healthy blood SERO donors. Our findings suggest this lateral flow assay could contribute significantly to implementing seroprevalence SERO testing in locations with active community transmission TRANS of SARS-CoV-2.

    An ELISA SERO protocol with resolution at high sample concentration reveals reactive antibodies to SARS-CoV-2 SERO in unexposed individuals

    Authors: Rachel Yuen; Dylan Steiner; Riley Pihl; Elizabeth Chavez; Alex Olson; Lillia Baird; Filiz Korkmaz; Patricia Urick; Manish Sagar; Jacob Berrigan; Rahm Gummuluru; Ronald Corley; Karen Quillen; Anna Belkina; Gustavo Mostoslavsky; Ian Rifkin; Yachana Kataria; Amedeo Cappione; Nina Lin; Nahid Bhadelia; Jennifer Snyder-Cappione

    doi:10.1101/2020.09.15.20192765 Date: 2020-09-18 Source: medRxiv

    The COVID-19 pandemic has significantly impacted work, economy, and way of life. The SARS-CoV-2 virus displays unique features including widely varying symptoms and outcomes between infected individuals. Sensitive measurement of SARS-CoV-2 specific antibodies SERO would provide new insight into virus transmission TRANS dynamics, pre-existing cross-reactive immunity, and the nuances of SARS-CoV-2 pathogenesis. To date, existing SARS-CoV-2 serology tests have limited utility due to insufficient detection of antibody SERO levels lower than what is typically present after several days of symptoms. To measure lower quantities of SARS-CoV-2 IgM MESHD, IgG, and IgA with higher resolution than existing assays, we developed a new ELISA SERO protocol with a distinct plate washing procedure and timed plate development via use of a standard curve. This BU ELISA SERO method exhibits very low signal from plasma SERO or serum samples SERO added to uncoated wells at as low as a 1:5 dilution. Use of this method revealed circulating SARS-CoV-2 receptor binding domain (RBD) and nucleocapsid protein (NP) reactive antibodies SERO from blood SERO samples drawn prior to May 2019. Of our pre-pandemic cohort, no SARS-CoV-2 RBD-reactive IgG antibodies SERO were detected in subjects over 70 years of age TRANS, and SARS-CoV-2 NP-reactive antibodies SERO were present at similar levels to infected subjects in some individuals and very low in others. Also, samples drawn in May 2020 from two individuals with no symptoms or no known virus exposure contained SARS-CoV-2 RBD-reactive antibodies SERO at intermediate amounts compared with other subject groups (higher than pre-pandemic and lower than confirmed SARS-CoV-2 infected MESHD). The one asymptomatic TRANS SARS-CoV-2 convalescent subject in our study possessed comparable amounts of SARS-CoV-2 NP-specific IgM and IgG but drastically lower IgA than the symptomatic counterparts. Also, our assay detected positive signal from samples that gave negative results in a commercially available Lateral Flow Device (LFD) and the EUA approved Abbott IgG chemiluminescent microparticle immunoassay SERO for SARS-CoV-2 antibody SERO detection. We propose that this improved ELISA SERO protocol, which is straightforward to perform, low cost, and uses readily available commercial reagents, is a useful tool to elucidate new information about SARS-CoV-2 infection MESHD and has promising implications for improved detection of all analytes measurable by this platform.

    Characterization and Phase 1 Trial of a B Cell Activating Anti-CD73 Antibody SERO for the Immunotherapy of COVID-19

    Authors: Stephen B Willingham; Gerard Criner; Craig Hill; Shenshen Hu; Jenny A Rudnick; Barbara Daine-Matsuoka; Jessica Hsieh; Haider Mashhedi; Andrew N Hotson; Joshua Brody; Thomas Marron; Emily Piccione; Joseph J Buggy; Suresh Mahabhashyam; William B Jones; Mehrdad Mobasher; Richard A Miller; Andreas Ingham; Joaquim Olle-Lopez; Eva Hoffmann; Charlotte Wilken-Jensen; Lone Krebs; Finn Stener Joergensen; Henrik Torkil Westh; Henrik Lovendahl Jorgensen; Nina la Cour Freiesleben; Henriette Svarre Nielsen

    doi:10.1101/2020.09.10.20191486 Date: 2020-09-15 Source: medRxiv

    COVID-19 is a global pandemic that has resulted in over 800,000 deaths. Robust humoral anti-viral immune responses have the potential to generate a diverse set of neutralizing antibodies SERO to eliminate viruses and protect against re-infection, transmission TRANS, and the evolution of mutations that escape targeted therapeutics. CD73 is present on the majority of human B cells and a subset of T cells where it plays a role in lymphocyte activation and migration. CD73 also functions as an ectoenzyme that converts AMP into adenosine, which can be immunosuppressive. Here we report on CPI-006, a humanized Fc{gamma}R binding-deficient IgG1 anti-CD73 antibody SERO that blocks CD73 enzymatic activity and directly activates CD73+ B cells, inducing differentiation into plasmablasts, immunoglobulin class switching, and antibody SERO secretion independent of adenosine. Immunophenotypic analysis of peripheral blood SERO from advanced cancer MESHD patients receiving CPI-006 revealed evidence of B cell activation, clonal expansion, and development of memory B cells. These immune effects suggested that CPI-006 may be effective at enhancing the magnitude, diversity, and duration of humoral and cellular responses to viruses such as SARS-CoV-2. We have therefore initiated a Phase 1, single-dose, dose-escalation trial in hospitalized patients with mild to moderate COVID-19. The objectives of this trial are to evaluate the safety of CPI-006 in COVID-19 patients and to determine effects of CPI-006 on anti- SARS-CoV-2 antibody SERO responses and the development of memory B cell and T cells. Ten patients have been enrolled in the trial receiving doses of 0.3 mg/kg or 1.0 mg/kg. All evaluable patients had low pre-treatment serum SERO levels of anti-viral antibodies to the SARS-CoV-2 SERO trimeric spike protein and its receptor binding domain, independent of the duration of their COVID-19 related symptoms prior to enrollment. Anti-viral antibody SERO responses were induced 7 days after CPI-006 treatment and titers continued to rise past Day 56. Increases in the frequency of memory B cells and effector/memory T cells were observed 28 days after treatment. These preliminary results suggest that CPI-006 activates B cells and may enhance and prolong anti- SARS-CoV-2 antibody SERO responses in patients with COVID-19. This approach may be useful for treating COVID-19 or as an adjuvant to enhance the efficacy of vaccines.

    Shedding of infectious SARS-CoV-2 from airways in hospitalized COVID-19 patients in relation to serum SERO antibody SERO responses

    Authors: Hedvig Glans; Sara Gredmark-Russ; Mikaela Olausson; Sara Falck-Jones; Renata Varnaite; Wanda Christ; Kimia T Maleki; Maria Lind Karlberg; Sandra Broddesson; Ryan Falck-Jones; Max Bell; Niclas Johansson; Anna Farnert; Anna Smed Sorensen; Jonas Klingstrom; Andreas Brave

    doi:10.1101/2020.09.11.20191940 Date: 2020-09-13 Source: medRxiv

    To understand the risk of transmission TRANS of SARS-CoV-2 in hospitalized COVID-19 patients we simultaneously assessed the presence of SARS-CoV-2 RNA, live infectious virus in the airways, and virus-specific IgG and neutralizing antibodies SERO in sera in 36 hospitalized COVID-19 patients. SARS-CoV-2 could be cultured from four patients, all with low or undetectable antibody SERO response. Our data suggests that the level of SARS-CoV-2 antibodies SERO may correlate to risk for shedding live SARS-CoV-2 virus in hospitalized COVID-19 patients.

    Retrospective study of COVID-19 seroprevalence SERO among tissue donors at the onset of the outbreak before implementation of strict lockdown measures in France

    Authors: Nicolas Germain; Stephanie Herwegh; Anne Sophie Hatzfeld; Laurence Bocket; Brigitte Prevost; Pierre Marie Danze; Philippe Marchetti; Rachael Dodd; Brooke Nickel; Kristen Pickles; Samuel Cornell; Thomas Dakin; Kirsten J McCaffery; Aboubacar Sidiki Magassouba; Arsen Arakelyan; Denise Haslwanter; Rohit Jangra; Alev Celikgil; Duncan Kimmel; James H Lee; Margarette Mariano; Antonio Nakouzi; Jose Quiroz; Johanna Rivera; Wendy A Szymczak; Karen Tong; Jason Barnhill; Mattias NE Forsell; Clas Ahlm; Daniel T. Stein; Liise-anne Pirofski; Doctor Y Goldstein; Scott J. Garforth; Steven C. Almo; Johanna P. Daily; Michael B. Prystowsky; James D. Faix; Amy S. Fox; Louis M. Weiss; Jonathan R. Lai; Kartik Chandran

    doi:10.1101/2020.09.11.20192518 Date: 2020-09-11 Source: medRxiv

    Background: The COVID-19 pandemic has altered organ and tissue donations as well as transplantation practices. SARS-CoV-2 serological tests SERO could help in the selection of donors. We assessed COVID-19 seroprevalence SERO in a population of tissue donors, at the onset of the outbreak in France, before systematic screening of donors for SARS-CoV-2 RNA. Methods: 235 tissue donors at the Lille Tissue bank between November 1, 2019 and March 16, 2020 were included. Archived serum SERO samples were tested for SARS-CoV-2 antibodies SERO using two FDA-approved kits. Results: Most donors were at higher risks for severe COVID-19 illness including age TRANS over 65 years (142/235) and/or presence of co-morbidities (141/235). According to the COVID-19 risk assessment of transmission TRANS, 183 out of 235 tissue donors presented with a low risk level and 52 donors with an intermediate risk level of donor derived infection MESHD. Four out of the 235 (1.7%) tested specimens were positive for anti- SARS-CoV-2 antibodies SERO: 2 donors with anti-N protein IgG and 2 other donors with anti-S protein total Ig. None of them had both type of antibodies SERO. Conclusion: Regarding the seroprevalence SERO among tissue donors, we concluded that the transmission TRANS probability to recipient via tissue products was very low at the beginning of the outbreak.

    Enhanced SARS-CoV-2 Neutralization by Secretory IgA in vitro

    Authors: Zijun Wang; Julio C C Lorenzi; Frauke Muecksch; Shlomo Finkin; Charlotte Viant; Christian Gaebler; Melissa Cipolla; Hans-Heinrich Hoffman; Thiago Y Oliveira; Deena A Oren; Victor Ramos; Lilian Nogueira; Eleftherios Michailidis; Davide F Robbiani; Anna Gazumyan; Charles M Rice; Theodora Hatziioannou; Paul D Bieniasz; Marina Caskey; Michel C Nussenzweig; Busra Yuksel; Ayse Buket Peksen; Oktay Gocenler; Ali Doga Yucel; Ozgur Can; Serena Ozabrahamyan; Alpsu Olkan; Ece Erdemoglu; Fulya Aksit; Gokhan Haci Tanisali; Oleksandr M. Yefanov; Anton Barty; Alexandra Tolstikova; Gihan K. Ketawala; Sabine Botha; E. Han Dao; Brandon Hayes; Mengning Liang; Matthew H Seaberg; Mark S. Hunter; Alex Batyuk; Valerio Mariani; Zhen Su; Frederic Poitevin; Chun Hong Yoon; Christopher J. Kupitz; Raymond G. Sierra; Edward H Snell; Hasan DeMirci

    doi:10.1101/2020.09.09.288555 Date: 2020-09-09 Source: bioRxiv

    SARS-CoV-2 primarily infects cells at mucosal surfaces. Serum SERO neutralizing antibody SERO responses are variable and generally low in individuals that suffer mild forms of the illness. Although potent IgG antibodies SERO can neutralize the virus, less is known about secretory antibodies SERO such as IgA that might impact the initial viral spread and transmissibility TRANS from the mucosa. Here we characterize the IgA response to SARS-CoV-2 in a cohort of 149 individuals. IgA responses in plasma SERO generally correlate with IgG responses and clones of IgM, IgG and IgA producing B cells that are derived from common progenitors are evident. Plasma SERO IgA monomers are 2-fold less potent than IgG equivalents. However, IgA dimers, the primary form in the nasopharynx, are on average 15 times more potent than IgA monomers. Thus, secretory IgA responses may be particularly valuable for protection against SARS-CoV-2 and for vaccine efficacy.

    Seroprevalence SERO and immunity of SARS-CoV-2 infection MESHD in children TRANS and adolescents in schools in Switzerland: design for a longitudinal, school-based prospective cohort study

    Authors: Agne Ulyte; Thomas Radtke; Irene Abela; Sarah H Haile; Julia Braun; Ruedi Jung; Christoph Berger; Alexandra Trkola; Jan Fehr; Milo A Puhan; Susi Kriemler; Anel Nurtay; Lucie Abeler-Dörner; David G Bonsall; Michael V McConnell; Shawn O'Banion; Christophe Fraser; Scott Roberts; Jose A. Gonzalez; Marciano Sablad; Rodrigo Yelin; Wendy Taylor; Kiyoshi Tachikawa; Suezanne Parker; Priya Karmali; Jared Davis; Sean M Sullivan; Steve G. Hughes; Pad Chivukula; Eng Eong Ooi

    doi:10.1101/2020.08.30.20184671 Date: 2020-09-02 Source: medRxiv

    Introduction Seroprevalence SERO and transmission TRANS routes of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection MESHD in children TRANS and adolescents, especially in school setting, are not clear. Resulting uncertainty is reflected in very different decisions on school closures and reopenings across countries. The aim of this longitudinal cohort study is to assess the extent and patterns of seroprevalence SERO of SARS-CoV-2 antibodies SERO in school-attending children TRANS repeatedly. It will examine risk factors for infection MESHD, relationship between seropositivity and symptoms, and temporal persistence of antibodies SERO. Additionally, it will include testing of school personnel and parents TRANS. Methods and analysis The study (Ciao Corona) will enroll a regionally representative, random sample of schools in the canton of Zurich, where 18% of the Swiss population live. Children TRANS aged TRANS 5 to 16 years, attending classes in primary and secondary schools are invited. Venous blood MESHD blood SERO and saliva samples are collected for SARS-CoV-2 serological testing SERO after the first wave of infections (June/July 2020), in fall HP (October/November 2020), and after winter (March/April 2021). Venous blood MESHD blood SERO is also collected for serological testing SERO of parents TRANS and school personnel. Bi-monthly questionnaires to children TRANS, parents TRANS and school personnel cover SARS-CoV-2 symptoms MESHD and tests, health, preventive behavior, lifestyle and quality of life information. Total seroprevalence SERO and cumulative incidence will be calculated. Hierarchical Bayesian logistic regression models will account for sensitivity SERO and specificity of the serological test SERO in the analyses and for the complex sampling structure, i.e., clustering within classes and schools. Ethics and dissemination The study was approved by the Ethics Committee of the Canton of Zurich, Switzerland (2020-01336). The results of this study will be published in peer-reviewed journals and will be made available to study participants and participating schools, the Federal Office of Public Health, and the Educational Department of the canton of Zurich. Trial registration number NCT04448717.

    Evaluation of commercially available immuno-magnetic agglutination and enzyme-linked immunosorbent assays SERO for rapid point-of-care diagnostics of COVID-19

    Authors: Maria Engel Moeller; Jeppe Fock; Pearlyn Pah; Antia De La Campa Veras; Melanie Bade; Marco Donolato; Simone Bastrup Israelsen; Jesper Eugen-Olsen; Thomas Benfield; Frederik Neess Engsig; Justin Manalac; Ana R Otrelo-Cardoso; Tho D Pham; Arjun Rustagi; Angela J Rogers; Nigam H Shah; Catherine A Blish; Jennifer R Cochran; Kari C Nadeau; Theodore S Jardetzky; James L Zehnder; Taia T Wang; Peter S Kim; Saurabh Gombar; Robert Tibshirani; Benjamin A Pinsky; Scott D Boyd

    doi:10.1101/2020.08.15.20172080 Date: 2020-08-17 Source: medRxiv

    Introduction: Coronavirus Disease MESHD 2019 (COVID-19) is caused by severe acute respiratory coronavirus-2 (SARS-CoV-2). Fast, accurate and simple blood SERO-based assays for quantification of anti- SARS-CoV-2 antibodies SERO are urgently needed to identify infected individuals and keep track of the spread of disease TRANS. Methods: The study included 35 plasma SERO samples from 22 individuals with confirmed COVID-19 by real time reverse transcriptase polymerase chain reaction and 40 non COVID-19 plasma SERO samples. Anti-SARS-CoV-2 IgM/IgA or IgG antibodies SERO were detected by a microfluidic quantitative immunomagnetic assay (IMA)(ViroTrack Sero COVID IgM+IgA/IgG Ab, Blusense Diagnostics, Denmark) and by enzyme-linked immunosorbent assay SERO (( ELISA SERO) (EuroImmun Medizinische Labordiagnostika, Germany). Results: Of the 35 plasma SERO samples from the COVID-19 patients, 29 (82.9%) were positive for IgA/IgM or IgG by IMA and 29 samples (82.9%) were positive by ELISA SERO. Sensitivity SERO for only one sample per patient was 68% for IgA+IgM and 73% IgG by IMA and 73% by ELISA SERO. For samples collected 14 days after symptom onset TRANS, the sensitivity SERO of both IMA and ELISA SERO was around 90%. Specificity of the IMA reached 100% compared to 95% for ELISA IgA SERO and 97.5% for ELISA IgG SERO. Conclusion: IMA for COVID-19 is a rapid simple-to-use point of care test with sensitivity SERO and specificity similar to a commercial ELISA SERO.

    Low awareness of past SARS-CoV-2 infection MESHD in healthy adults TRANS

    Authors: Katja van den Hurk; Eva-Maria Merz; Femmeke J. Prinsze; Marloes L.C. Spekman; Franke A. Quee; Steven Ramondt; Ed Slot; Hans Vrielink; Elisabeth M.J. Huis in 't Veld; Hans L. Zaaijer; Boris M. Hogema

    doi:10.1101/2020.08.10.20171561 Date: 2020-08-12 Source: medRxiv

    Background The coronavirus disease MESHD 2019 (COVID-19) pandemic challenges governments worldwide to balance appropriate virus control measures and their societal and economic consequences. These control measures include the identification, isolation and testing of potentially infected individuals. As this relies on an individual's awareness of infection, we investigated the extent to which healthy adults TRANS suspected having had COVID-19, and how COVID-19 suspicion and symptoms relate to antibodies SERO indicative of a past infection with the severe HP infection with the severe MESHD acute respiratory syndrome coronavirus 2 MESHD (SARS-CoV-2). Methods and findings Individuals donating plasma SERO anywhere in the Netherlands between May 11th and 18th were screened for total SARS-CoV-2 antibodies SERO using ELISA SERO and invited to participate in an online questionnaire about COVID-19-related symptoms and awareness. Antibody SERO and questionnaire data were complete for 3,676 individuals, including 239 (6.5%) that tested positive for SARS-CoV-2 antibodies SERO. Here, we show that a 38% of the individuals that tested positive for SARS-CoV-2 antibodies SERO reported having had no or only very mild symptoms at any time during the peak of the epidemic. The loss of taste and/or smell in particular was significantly associated with seropositivity, independent of age TRANS and sex. Forty-eight percent of antibody SERO-positive persons did not suspect having had COVID-19, in spite of most of them reporting symptoms. Conclusions Awareness of infection MESHD was low among individuals that tested positive for SARS-CoV-2 antibodies SERO, even at the peak of the epidemic. Improved awareness and recognition of COVID-19 symptoms and tracing TRANS of asymptomatic TRANS contacts is crucial to halting SARS-CoV-2 transmission TRANS.

    SARS-CoV-2 seroprevalence SERO survey among 18,000 healthcare and administrative personnel at hospitals, pre-hospital services, and specialist practitioners in the Central Denmark Region

    Authors: Sanne Jespersen; Susan Mikkelsen; Thomas Greve; Kathrine Agergaard Kaspersen; Martin Tolstrup; Jens Kjaergaard Boldsen; Jacob Dvinge Redder; Kent Nielsen; Anders Moensted Abildgaard; Henrik Albert Kolstad; Lars Oestergaard; Marianne Kragh Thomsen; Holger Jon Moeller; Christian Erikstrup

    doi:10.1101/2020.08.10.20171850 Date: 2020-08-12 Source: medRxiv

    Objectives: The objective of this study was to perform a large seroprevalence SERO survey on severe acute respiratory syndrome coronavirus 2 MESHD (SARS-CoV-2) among Danish healthcare workers to identify high risk groups. Design: Cross-sectional survey. Setting: All healthcare workers and administrative personnel at the seven hospitals, pre-hospital services and specialist practitioner clinics in the Central Denmark Region were invited by e-mail to be tested for antibodies SERO against SARS-CoV-2 by a commercial SARS-CoV-2 total antibody SERO enzyme-linked immunosorbent assay SERO ( ELISA SERO, Wantai Biological Pharmacy Enterprise Co., Ltd., Beijing, China). Participants: A total of 25,950 participants were invited. Of these, 17,987 (69%) showed up for blood SERO sampling, and 17,971 had samples available for SARS-CoV-2 antibody SERO testing. Main outcome measures: 1) Prevalence SERO of SARS-CoV-2 antibodies SERO; 2) Risk factors for seropositivity; 3) Association of SARS-CoV-2 RNA and antibodies SERO. Results: After adjustment for assay sensitivity SERO and specificity, the overall seroprevalence SERO was 3.4% (CI: 2.5%-3.8%). The seroprevalence SERO was higher in the western part of the region than in the eastern part (11.9% vs 1.2%, difference: 10.7 percentage points, CI: 9.5-12.2). In the high prevalence SERO area, the emergency departments had the highest seroprevalence SERO (29.7%) while departments without patients or with limited patient contact had the lowest seroprevalence SERO (2.2%). Multivariable logistic regression analysis with age TRANS, sex, and profession as the predictors showed that nursing staff, medical doctors, and biomedical laboratory scientists had a higher risk than medical secretaries, who served as reference (OR = 7.3, CI: 3.5-14.9; OR = 4., CI: 1.8-8.9; and OR = 5.0, CI: 2.1-11.6, respectively). Among the total 668 seropositive participants, 433 (64.8%) had previously been tested for SARS-CoV-2 RNA, and 50.0% had a positive RT-PCR result. A total of 98% of individuals who had a previous positive viral RNA test were also found to be seropositive. Conclusions: We found large differences in the prevalence SERO of SARS-CoV-2 antibodies SERO in staff working in the healthcare sector within a small geographical area of Denmark and signs of in-hospital transmission TRANS. Half of all seropositive staff had been tested positive by PCR prior to this survey. This study raises awareness of precautions which should be taken to avoid in-hospital transmission TRANS. Additionally, regular testing of healthcare workers for SARS-CoV-2 should be considered to identify areas with increased transmission TRANS. Trial registration: The study is approved by the Danish Data Protection Agency (1-16-02-207-20).

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MeSH Disease
Human Phenotype
Transmission
Seroprevalence


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