scholarly journals Prevalence of IgG antibodies to SARS-CoV-2 in Wuhan – implications for the ability to produce long-lasting protective antibodies against SARS-CoV-2

2020 ◽  
Author(s):  
Tao Liu ◽  
Sanyun Wu ◽  
Huangheng Tao ◽  
Guang Zeng ◽  
Fuling Zhou ◽  
...  
Keyword(s):  
Healthcare Workers ◽  
Healthcare Providers ◽  
Significant Proportion ◽  
Development Program ◽  
Data Access ◽  
Igg Antibodies ◽  
Funding Sources ◽  
Protective Antibodies

AbstractBackgroundIt is to be determined whether people infected with SARS-CoV-2 will develop long-term immunity against SARS-CoV-2 and retain long-lasting protective antibodies after the infection is resolved. This study was to explore to explore the outcomes of IgG antibodies to SARS-CoV-2 in four groups of individuals in Wuhan, China.MethodsWe included the following four groups of individuals who received both COVID-19 IgM/IgG tests and RT-PCR tests for SARS-CoV-2 from February 29, 2020 to April 29, 2020: 1470 hospitalized patients with COVID-19 from Leishenshan Hospital, Zhongnan Hospital of Wuhan University, and Wuhan No. 7 Hospital, 3832 healthcare providers without COVID-19 diagnosis, 19555 general workers, and 1616 other patients to be admitted to the hospital (N=26473). COVID-19 patients who received IgM/IgG tests <21 days after symptom onset were excluded.ResultsIgG prevalence was 89.8% (95% CI 88.2-91.3%) in COVID-19 patients, 4.0% (95% CI 3.4-4.7%) in healthcare providers, 4.6 (95% CI 4.3-4.9 %) in general workers, and 1.0% in other patients (p all <0.001 for comparisons with COVID-19 patients). IgG prevalence increased significantly by age among healthcare workers and general workers. Prevalence of IgM antibodies to SARS-CoV-2 was 31.4% in COVID-19 patients, 1.5% in healthcare providers, 1.3% in general workers, and 0.2% in other patients.ConclusionsVery few healthcare providers had IgG antibodies to SARS-CoV-2, though a significant proportion of them had been infected with the virus. After SARS-CoV-2 infection, people are unlikely to produce long-lasting protective antibodies against this virus.Primary Funding SourcesPart of the study was supported by National Key Research and Development Program of China (2020YFC0845500). The content is solely the responsibility of the authors and does not necessarily represent the official views of the sponsors.Role of the Funder/SponsorThe sponsors had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript, and decision to submit the manuscript for publication.Data and code availability statementData and analyses codes are available from the corresponding authors on request. All request for raw and analyzed data and materials will be reviewed by the corresponding authors to verify whether the request is subject to any intellectual property or confidentiality obligations. Access will be granted after a signed data access agreement is attained.

scholarly journals Prevalence of IgG Antibodies to SARS-CoV-2 in Wuhan – Implications for the Longevity of Antibodies Against SARS-CoV-2

2020 ◽  
Author(s):  
Tao Liu ◽  
Sanyun Wu ◽  
Huangheng Tao ◽  
Guang Zeng ◽  
Fuling Zhou ◽  
...  
Keyword(s):  
Healthcare Workers ◽  
Healthcare Providers ◽  
Cross Sectional Study ◽  
Hospitalized Patients ◽  
Igg Antibodies ◽  
Rt Pcr ◽  
Cross Sectional ◽  
Infected People ◽  
Antibody Tests

Abstract Background It is to be determined whether people infected with SARS-CoV-2 will develop long-term immunity against SARS-CoV-2 and retain long-lasting antibodies after the infection is resolved. This study was to explore the outcomes of IgG antibodies to SARS-CoV-2 in four groups of individuals in Wuhan, China.MethodsWe conducted a cross-sectional study on the following four groups who received both COVID-19 IgM/IgG tests and RT-PCR tests for SARS-CoV-2 from February 29, 2020 to April 29, 2020: 1470 hospitalized patients with COVID-19 from Leishenshan Hospital, Zhongnan Hospital of Wuhan University, and Wuhan No. 7 Hospital, 3832 healthcare providers without COVID-19 diagnosis, 19555 general workers, and 1616 other patients to be admitted to the hospital (N=26473). COVID-19 patients who received IgM/IgG tests <21 days after symptom onset were excluded. Results IgG prevalence was 89.8% (95% CI 88.2-91.3%) in COVID-19 patients, 4.0% (95% CI 3.4-4.7%) in healthcare providers, 4.6 (95% CI 4.3-4.9 %) in general workers, and 1.0% in other patients (p all <0.001 for comparisons with COVID-19 patients). IgG prevalence increased significantly by age among healthcare workers and general workers. Among hospitalized COVID-19 patients, presence of IgG antibodies to SARS-CoV-2 was not associated with most disease severity, presence of comorbidities, treatment received, and clinical characteristics. We identified 24 hospitalized patients with COVID-19 and multiple COVID-19 antibody tests who lost previously detected IgG antibodies to SARS-CoV-2ConclusionsIgG antibodies to SARS-CoV-2 in infected people may become undetectable overtime.

scholarly journals Flavonoids Ameliorate Stress-Induced Depression by Preventing NLRP3 Inflammasome Priming

2020 ◽  
Vol 4 (Supplement_2) ◽  
pp. 1231-1231
Author(s):  
Giulio Pasinetti
Keyword(s):  
Mrna Expression ◽  
Chronic Stress ◽  
Nlrp3 Inflammasome ◽  
Signaling Cascades ◽  
Dietary Polyphenols ◽  
Funding Sources ◽  
Glycation End Products ◽  
Molecular Patterns

Abstract Objectives Chronic stress activates danger-associated molecular patterns (DAMPs), stimulating the NLRP3 inflammasome. NLRP3 activation triggers the release of pro-inflammatory cytokine IL-1β. The activity of the NLRP3 inflammasome propagates pro-inflammatory signaling cascades implicated in the onset of depression. Our previous studies show that polyphenolic compounds were found to ameliorate stress induced depression in mouse models. However, the relevant mechanism has not been identified. This study examined the effect of administering polyphenols on DAMP signaling in enriched mice microglia. Methods This study examined the effect of administering polyphenols on DAMP signaling in mice microglia. To recapitulate stress-induced depression, mice underwent chronic unpredictable stress (CUS). Microglia were isolated at various time points throughout the CUS protocol. We also assessed long-term persistent changes after CUS and susceptibility to subthreshold unpredictable stress (US) re-exposure. Results Interestingly, the development of US – induced depression and anxiety depended upon a previous exposure to CUS. We found that CUS caused robust upregulation of IL-1β mRNA in enriched microglia, an effect that persists for up to 4 weeks following CUS exposure. Following the subthreshold US re-exposure, we observed the upregulation of pro- IL-1β as well as pro-receptor for advanced glycation end products (RAGE). Toll-like receptor 4 (TLR-4) was not. We also observed an increase in RAGE mRNA expression when mice were exposed to US prior to the start of the CUS paradigm. Importantly, a primary exposure to US, was sufficient to increase RAGE mRNA expression. We found that polyphenol administration significantly improved CUS-induced depressive-like phenotypes and also reversed neuroinflammation in mice. Treatment with dietary flavonoids prevented upregulation of IL-1β, RAGE mRNA, which reflects the ability of polyphenols that may have begun following the primary exposure to US. Conclusions Taken all together, the results provide evidence of the role of dietary polyphenols in preventing persistent microglial activation, which has been shown to result in reduced long term vulnerability to depressive-like behaviors following expose to chronic stress. Funding Sources This study was supported by a P50 CARBON Center grant from the NCCIH/ODS.

scholarly journals Prevalence and Course of IgA and IgG Antibodies against SARS-CoV-2 in Healthcare Workers during the First Wave of the COVID-19 Outbreak in Germany: Interim Results from an Ongoing Observational Cohort Study

Healthcare ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 498
Author(s):  
Mark Reinwald ◽  
Peter Markus Deckert ◽  
Oliver Ritter ◽  
Henrike Andresen ◽  
Andreas G. Schreyer ◽  
...  
Keyword(s):  
Cohort Study ◽  
Healthcare Workers ◽  
Significant Proportion ◽  
Clinical Signs ◽  
Signs And Symptoms ◽  
Observational Cohort Study ◽  
Igg Antibodies ◽  
University Hospitals ◽  
Observational Cohort

(1) Background: Healthcare workers (HCWs) are prone to intensified exposure to severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection in the ongoing pandemic. We prospectively analyzed the prevalence of antibodies against SARS-CoV-2 in HCWs at baseline and follow up with regard to clinical signs and symptoms in two university hospitals in Brandenburg, Germany. (2) Methods: Screening for anti-SARS-CoV-2 IgA and IgG antibodies was offered to HCWs at baseline and follow up two months thereafter in two hospitals of Brandenburg Medical School during the first wave of the COVID-19 pandemic in Germany in an ongoing observational cohort study. Medical history and signs and symptoms were recorded by questionnaires and analyzed. (3) Results: Baseline seroprevalence of anti-SARS-CoV-2 IgA was 11.7% and increased to 15% at follow up, whereas IgG seropositivity was 2.1% at baseline and 2.2% at follow up. The rate of asymptomatic seropositive cases was 39.5%. Symptoms were not associated with general seropositivity for anti-SARS-CoV-2; however, class switch from IgA to IgG was associated with increased symptom burden. (4) Conclusions: The seroprevalence of antibodies against SARS-CoV-2 was low in HCWs but higher compared to population data and increased over time. Screening for antibodies detected a significant proportion of seropositive participants cases without symptoms.

scholarly journals Exploring the Experience of Healthcare Workers Who Returned to Work After Recovering From COVID-19: A Qualitative Study

2021 ◽  
Vol 12 ◽  
Author(s):  
Hui Zhang ◽  
Dandan Chen ◽  
Ping Zou ◽  
Nianqi Cui ◽  
Jing Shao ◽  
...  
Keyword(s):  
Interpersonal Relationships ◽  
Healthcare Workers ◽  
Healthcare Providers ◽  
Large Body ◽  
Symptom Burden ◽  
Physical Symptom ◽  
Work And Family ◽  
Term Care ◽  
Qualitative Descriptive

Background: To date, a large body of literature focuses on the experience of healthcare providers who cared for COVID-19 patients. Qualitative studies exploring the experience of healthcare workers in the workplace after recovering from COVID-19 are limited. This study aimed to describe the experience of healthcare workers who returned to work after recovering from COVID-19.Methods: This study employed a qualitative descriptive approach with a constructionist epistemology. Data were collected through semi-structured in-depth interviews with 20 nurses and physicians, and thematic analysis was used to identify themes from the interview transcripts.Results: Three major themes about the psychological experiences of healthcare workers who had recovered from COVID-19 and returned to work were identified: (1) holding multi-faceted attitudes toward the career (sub-themes: increased professional identity, changing relationships between nurses, patients, and physicians, and drawing new boundaries between work and family), (2) struggling at work (sub-themes: poor interpersonal relationships due to COVID-19 stigma, emotional symptom burden, physical symptom burden, and workplace accommodations), (3) striving to return to normality (sub-themes: deliberate detachment, different forms of social support in the workplace, and long-term care from organizations).Conclusions: The findings have highlighted opportunities and the necessity to promote health for this population. Programs centered around support, care, and stress management should be developed by policymakers and organizations. By doing this, healthcare workers would be better equipped to face ongoing crises as COVID-19 continues.

scholarly journals Intervention Serology and Interaction Substitution: Modeling the Role of ‘Shield Immunity’ in Reducing COVID-19 Epidemic Spread

2020 ◽  
Author(s):  
Joshua S. Weitz ◽  
Stephen J. Beckett ◽  
Ashley R. Coenen ◽  
David Demory ◽  
Marian Dominguez-Mirazo ◽  
...  
Keyword(s):  
Control Strategies ◽  
The Elderly ◽  
Serological Tests ◽  
Goods And Services ◽  
Central Public Health ◽  
Potential Development ◽  
Present Context ◽  
Protective Antibodies

The COVID-19 pandemic has precipitated a global crisis, with more than 690,000 confirmed cases and more than 33,000 confirmed deaths globally as of March 30, 2020 [1–4]. At present two central public health control strategies have emerged: mitigation and suppression (e.g, [5]). Both strategies focus on reducing new infections by reducing interactions (and both raise questions of sustainability and long-term tactics). Complementary to those approaches, here we develop and analyze an epidemiological intervention model that leverages serological tests [6, 7] to identify and deploy recovered individuals as focal points for sustaining safer interactions via interaction substitution, i.e., to develop what we term ‘shield immunity’ at the population scale. Recovered individuals, in the present context, represent those who have developed protective, antibodies to SARS-CoV-2 and are no longer shedding virus [8]. The objective of a shield immunity strategy is to help sustain the interactions necessary for the functioning of essential goods and services (including but not limited to tending to the elderly [9], hospital care, schools, and food supply) while decreasing the probability of transmission during such essential interactions. We show that a shield immunity approach may significantly reduce the length and reduce the overall burden of an outbreak, and can work synergistically with social distancing. The present model highlights the value of serological testing as part of intervention strategies, in addition to its well recognized roles in estimating prevalence [10, 11] and in the potential development of plasma-based therapies [12–15].

scholarly journals Persistence of Antibodies Against Spike Glycoprotein of SARS-CoV-2 in Healthcare Workers Post Double Dose of BBV-152 and AZD1222 Vaccines

2021 ◽  
Vol 8 ◽  
Author(s):  
Hari Ram Choudhary ◽  
Debaprasad Parai ◽  
Girish Chandra Dash ◽  
Jaya Singh Kshatri ◽  
Narayan Mishra ◽  
...  
Keyword(s):  
Antibody Titer ◽  
Healthcare Workers ◽  
Igg Antibodies ◽  
Serum Samples ◽  
History Of ◽  
Antibody Titers ◽  
Chemiluminescent Microparticle Immunoassay ◽  
Research Facilities

Purpose: We investigated the persistence of the vaccine-induced immunoglobulin G (IgG) antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) among healthcare workers (HCWs) in Odisha who received a complete dose of either Covaxin or Covishield vaccine.Methods: This 24-week longitudinal cohort study was conducted from January to July 2021 with participants from 6 healthcare and research facilities of Odisha to understand the dynamicity of the vaccine-induced IgG antibodies against SARS-CoV-2 after the complete dose of vaccines.Results: Serum samples were collected from 614 participants during each follow-up and were tested in two chemiluminescent microparticle immunoassay (CLIA)-based platforms to detect SARS-CoV-2 antibodies both qualitatively and quantitatively. Among these participants, 308 (50.2%) participants were Covishield recipients and the rest 306 (49.8%) participants took Covaxin. A total of 81 breakthrough cases were recorded and the rest 533 HCWs without any history of postvaccination infection showed significant antibody waning either from T3 (Covaxin recipient) or T4 (Covishield recipient). The production of vaccine-induced IgG antibodies is significantly higher (p &lt; 0.001) in Covishield compared with Covaxin. Covishield recipients produced higher median anti-S IgG titer than Covaxin. No statistically significant differences in antibody titers were observed based on age, gender, comorbidities, and blood groups.Conclusion: This 6-month follow-up study documents a 2-fold and 4-fold decrease in spike antibody titer among Covishield and Covaxin recipients, respectively. The clinical implications of antibody waning after vaccination are not well understood. It also highlights the need for further data to understand the long-term persistence of vaccine-induced antibody and threshold antibody titer required for protection against reinfection.

scholarly journals Effects of ZIKV + IgG+ complex on murine microglial cells

2021 ◽  
Author(s):  
Giulia Pinzetta ◽  
Nicole Bernd Becker ◽  
Felipe Krimberg ◽  
Ângela Zanatta ◽  
Laura Siqueira ◽  
...  
Keyword(s):  
Mitochondrial Membrane ◽  
Microglial Activation ◽  
Ros Production ◽  
Transplacental Transmission ◽  
Igg Antibodies ◽  
Murine Microglia ◽  
The Central Nervous System ◽  
Complex Methods

Background: Infection by Zika virus (ZIKV) is associated with damage to the Central Nervous System, such as Congenital Zika Syndrome1 . Due to its transplacental transmission, ZIKV induces neuroinflammation and microglial activation, resulting in lesions that can compromise neurodevelopment2-4. The fetus protection can be provided by maternal antibodies. However, this protection is still controversial5 . In this context, it is necessary to elucidate the effects of ZIKV and the mechanisms involved. Objectives: The present work aim to evaluate the role of the ZIKV+IgG+ complex in murine microglia cells (BV2). Design and setting: BV2 were exposed for 24 or 72 hours, to ZIKV, ZIKA-IgG+ or ZIKV+IgG+ complex. Methods: Effects of exposure to treatments were evaluated by MTT, oxidation of DCFHDA (ROS production)6 and mitochondrial membrane potential (Δ∴ϑ), measured by JC-17 assay. Results: It was observed that ZIKV-IgG+ and the ZIKV+IgG+ complex are cytotoxic to microglia, impairing the viability of these cells, altering Δ∴ϑ and inducing the production of ROS, especially in long-term exposure8,9. Negative action mediated by these antibodies may be a result of oxidative stress and a intervention in the Δ∴ϑ. Conclusion: ZIKV-IgG+ antibodies are harmful to microglia and these mechanisms may be related to the potential for ZIKV neuroinflammation.

scholarly journals Polyphenolic Compounds Ameliorate Stress-induced Depression by Preventing NLRP3 Inflammasome Priming (P19-011-19)

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Tal Frolinger ◽  
Giulio Pasinetti
Keyword(s):  
Mrna Expression ◽  
Chronic Stress ◽  
Nlrp3 Inflammasome ◽  
Polyphenolic Compounds ◽  
Dietary Polyphenols ◽  
Funding Sources ◽  
Glycation End Products ◽  
Molecular Patterns

Abstract Objectives Chronic stress activates danger-associated molecular patterns (DAMPs), which then stimulate the NLRP3 inflammasome. NLRP3 activation triggers the released of the pro-inflammatory cytokine IL‐1β.The activity of the NLRP3 inflammasome propagates pro-inflammatory signaling cascades implicated in the onset of depression. In previous studies conducted in our lab, polyphenolic compounds were found to ameliorate stress induced depression in mouse models. However, the mechanism by which they do so has not been identified. This study examined the effect of administering polyphenols on DAMP signaling in enriched mice microglia. Methods This study examined the effect of administering polyphenols on DAMP signaling in mice microglia. To recapitulate stress-induced depression, mice underwent chronic unpredictable stress (CUS). Microglia were isolated at various time points throughout the CUS protocol. We also assessed long-term persistent changes after CUS and susceptibility to subthreshold unpredictable stress (US) re-exposure. Results Interestingly, the development of US - induced depression and anxiety depended upon a previous exposure to CUS. We found that CUS caused robust upregulation of IL-1β mRNA in enriched microglia, an effect that persists for up to 4 weeks following CUS exposure. Following the subthreshold US re-exposure, we observed the upregulation of pro- IL-1β as well as pro-receptor for advanced glycation end products (RAGE). Toll-like receptor 4 (TLR-4) was not. We also observed an increase in RAGE mRNA expression when mice were exposed to US prior to the start of the CUS paradigm. Importantly, a primary exposure to US, was sufficient to increase RAGE mRNA expression. We found that polyphenol administration improved CUS-induced depressive-like phenotypes and also reversed neuroinflammation in mice. Treatment with dietary polyphenols prevented upregulation of IL-1β, RAGE mRNA, which reflects the ability of polyphenols that may have begun following the primary exposure to US. Conclusions Taken all together, the results provide evidence of the role of polyphenols in preventing persistent microglial activation, which has been shown to result in reduced long term vulnerability to depressive-like behaviors following expose to chronic stress. Funding Sources This study was supported by a P50 CARBON Center grant from the NCCIH and ODS.

scholarly journals Artificial intelligence: opportunities and implications for the health workforce

2020 ◽  
Vol 12 (4) ◽  
pp. 241-245 ◽  
Author(s):  
Indrajit Hazarika
Keyword(s):  
Artificial Intelligence ◽  
Occupational Stress ◽  
Health Workforce ◽  
Healthcare Workers ◽  
Healthcare Providers ◽  
Full Potential ◽  
Provider Performance ◽  
Balanced Approach ◽  
Cyclic Data

Abstract Healthcare involves cyclic data processing to derive meaningful, actionable decisions. Rapid increases in clinical data have added to the occupational stress of healthcare workers, affecting their ability to provide quality and effective services. Health systems have to radically rethink strategies to ensure that staff are satisfied and actively supported in their jobs. Artificial intelligence (AI) has the potential to augment provider performance. This article reviews the available literature to identify AI opportunities that can potentially transform the role of healthcare providers. To leverage AI’s full potential, policymakers, industry, healthcare providers and patients have to address a new set of challenges. Optimizing the benefits of AI will require a balanced approach that enhances accountability and transparency while facilitating innovation.

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