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1.
Geopolitics ; 28(4):1632-1657, 2023.
Article in English | Academic Search Complete | ID: covidwho-20244876

ABSTRACT

The COVID-19 pandemic and interventions addressing it raise important questions about human mobility that have geopolitical implications. This forum uses mobility and immobility during the pandemic as lenses onto the ways that routinised state power reacts to acute uncertainties, as well as how these reactions impact politics and societies. Specifically, we propose the concept of "shock mobility" as migratory routines radically reconfigured: emergency flights from epicentres, mass repatriations, lockdowns, quarantines. Patterns of shock mobility and immobility are not new categories of movement, but rather are significant alterations to the timing, duration, intensity, and relations among existing movements. Many of these alterations have been induced by governments' reactions to the pandemic in both migrant-sending and receiving contexts, which can be especially consequential for migrants in and from the Global South. Our interventions explore these processes by highlighting experiences of Afghans and Kurds along Iran's borders, Western Africans in Europe, Filipino workers, irregular Bangladeshis in Qatar, Central Americans travelling northwards via Mexico, and rural-urban migrants in India. In total, we argue that tracing shocks' dynamics in a comparative manner provides an analytical means for assessing the long-term implications of the pandemic, building theories about how and why any particular post-crisis world emerges as it does, and paving the way for future empirical work. [ FROM AUTHOR] Copyright of Geopolitics is the property of Routledge and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full . (Copyright applies to all s.)

2.
Clin Infect Dis ; 2023 Apr 20.
Article in English | MEDLINE | ID: covidwho-20236445

ABSTRACT

We administered SARS-CoV-2 VST under emergency IND to 6 immunocompromised patients with persistent COVID-19 and characterized clinical and virologic responses: three patients had partial responses after failing other therapies but then died. Two patients completely recovered, but the role of VST in recovery was unclear due to concomitant use of other antivirals. One patient had not responded to two courses of remdesivir and experienced sustained recovery after VST. The use VST in immunocompromised patient with persistent COVID-19 requires further study.

3.
Environ Sci Pollut Res Int ; 30(31): 76687-76701, 2023 Jul.
Article in English | MEDLINE | ID: covidwho-20233111

ABSTRACT

The COVID-19 pandemic resulted in the collapse of healthcare systems and led to the development and application of several approaches of wastewater-based epidemiology to monitor infected populations. The main objective of this study was to carry out a SARS-CoV-2 wastewater based surveillance in Curitiba, Southern Brazil Sewage samples were collected weekly for 20 months at the entrance of five treatment plants representing the entire city and quantified by qPCR using the N1 marker. The viral loads were correlated with epidemiological data. The correlation by sampling points showed that the relationship between the viral loads and the number of reported cases was best described by a cross-correlation function, indicating a lag between 7 and 14 days amidst the variables, whereas the data for the entire city presented a higher correlation (0.84) with the number of positive tests at lag 0 (sampling day). The results also suggest that the Omicron VOC resulted in higher titers than the Delta VOC. Overall, our results showed that the approach used was robust as an early warning system, even with the use of different epidemiological indicators or changes in the virus variants in circulation. Therefore, it can contribute to public decision-makers and health interventions, especially in vulnerable and low-income regions with limited clinical testing capacity. Looking toward the future, this approach will contribute to a new look at environmental sanitation and should even induce an increase in sewage coverage rates in emerging countries.


Subject(s)
COVID-19 , Myrtaceae , Humans , Wastewater , SARS-CoV-2 , Sewage , COVID-19/epidemiology , Brazil/epidemiology , Pandemics
4.
Pediatr Nephrol ; 2023 Jun 01.
Article in English | MEDLINE | ID: covidwho-20232878

ABSTRACT

BACKGROUND: Coronavirus disease 2019 (COVID-19) was officially declared a pandemic by the World Health Organisation (WHO) on 11 March 2020, as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spread rapidly across the world. We investigated the seroprevalence of anti-SARS-CoV-2 antibodies in pediatric patients on dialysis or kidney transplantation in the UK. METHODS: Excess sera samples were obtained prospectively during outpatient visits or haemodialysis sessions and analysed using a custom immunoassay calibrated with population age-matched healthy controls. Two large pediatric centres contributed samples. RESULTS: In total, 520 sera from 145 patients (16 peritoneal dialysis, 16 haemodialysis, 113 transplantation) were analysed cross-sectionally from January 2020 until August 2021. No anti-SARS-CoV-2 antibody positive samples were detected in 2020 when lockdown and enhanced social distancing measures were enacted. Thereafter, the proportion of positive samples increased from 5% (January 2021) to 32% (August 2021) following the emergence of the Alpha variant. Taking all patients, 32/145 (22%) were seropositive, including 8/32 (25%) with prior laboratory-confirmed SARS-CoV-2 infection and 12/32 (38%) post-vaccination (one of whom was also infected after vaccination). The remaining 13 (41%) seropositive patients had no known stimulus, representing subclinical cases. Antibody binding signals were comparable across patient ages and dialysis versus transplantation and highest against full-length spike protein versus spike subunit-1 and nucleocapsid protein. CONCLUSIONS: Anti-SARS-CoV-2 seroprevalence was low in 2020 and increased in early 2021. Serological surveillance complements nucleic acid detection and antigen testing to build a greater picture of the epidemiology of COVID-19 and is therefore important to guide public health responses. A higher resolution version of the Graphical abstract is available as Supplementary information.

5.
Telemed J E Health ; 2023 May 23.
Article in English | MEDLINE | ID: covidwho-2327273

ABSTRACT

Introduction: Although telemedicine emerged during the COVID-19 pandemic as a critical mode of health care delivery, there may be differences in the perceived ease of patient-clinician communication and quality of care for telemedicine versus in-person visits, as well as variation in perceptions across patient subgroups. We examined patients' experiences with and preferences for telemedicine relative to in-person care, based on their most recent visit. Methods: We conducted a survey of 2,668 adults in a large academic health care system in November 2021. The survey captured patients' reasons for their most recent visit, perceptions on patient-clinician communication and quality of care, and attitudes toward telemedicine versus in-person care. Results: Among respondents, 552 (21%) had a telemedicine visit. Patients with telemedicine and in-person visits had similar agreement on ease of patient-clinician communication and perceived quality of the visit on average. However, for individuals 65 years of age or older, men, and those not needing urgent care, telemedicine was associated with worse perceptions of patient-clinician communication (65 years of age or older: adjusted odds ratio [aOR], 0.51; 95% confidence interval [CI], 0.31-0.85; men: aOR, 0.50; 95% CI, 0.31-0.81; urgent care: aOR 0.67; 95% CI, 0.49-0.91) and lower perceived quality (65 years of age or older, aOR 0.51; 95% CI, 0.30-0.86; men: 0.51; 95% CI, 0.32-0.83; urgent care: aOR 0.68; 95% CI, 0.49-0.93). Conclusion: Patient-perceived quality of care and patient-clinician communication were similar for telemedicine and in-person visits overall. However, among men, older adults, and those not seeking urgent care, patients using telemedicine had lower perceptions of patient-clinician communication and quality.

6.
Health Secur ; 20(4): 339-347, 2022.
Article in English | MEDLINE | ID: covidwho-2309296

ABSTRACT

The definitive care component of the National Disaster Medical System (NDMS) may not be able to effectively manage tens of thousands of casualties resulting from a catastrophic disaster incident or overseas conflict. To address this potential national security threat, Congress authorized the US Secretary of Defense to conduct the NDMS Pilot Program to improve the interoperability, special capabilities, and patient capacity of the NDMS. The pilot's first phase was the Military-Civilian NDMS Interoperability Study, designed to identify broad themes to direct further NDMS research. Researchers conducted a series of facilitated discussions with 49 key NDMS federal and civilian (private sector) stakeholders to identify and assess weaknesses and opportunities for improving the NDMS. After qualitative analysis, 6 critical themes emerged: (1) coordination, collaboration, and communication between federal and private sector NDMS partners; (2) funding and incentives for improved surge capacity and preparedness for NDMS partners; (3) staffing capacity and competencies for government and private NDMS partners; (4) surge capacity, especially at private sector healthcare facilities; (5) training, education, and exercises and knowledge sharing between federal and private sector NDMS partners; and (6) metrics, benchmarks, and modeling for NDMS partners to track their NDMS-related capabilities and performance. These findings provide a roadmap for federal-level changes and additional operations research to strengthen the NDMS definitive care system, particularly in the areas of policy and legislation, operational coordination, and funding.


Subject(s)
Disaster Planning , Disasters , Military Personnel , Carbolines , Communication , Disaster Planning/methods , Humans
7.
J Emerg Manag ; 21(7): 11-14, 2023.
Article in English | MEDLINE | ID: covidwho-2296427

Subject(s)
COVID-19 , Humans , Pandemics , SARS-CoV-2
8.
Journal of Geophysical Research Atmospheres ; 128(6), 2023.
Article in English | ProQuest Central | ID: covidwho-2257703

ABSTRACT

The radiative effects of the large‐scale air traffic slowdown during April and May 2020 due to the international response to the COVID‐19 pandemic are estimated by comparing the coverage (CC), optical properties, and radiative forcing of persistent linear contrails over the conterminous United States and two surrounding oceanic air corridors during the slowdown period and a similar baseline period during 2018 and 2019 when air traffic was unrestricted. The detected CC during the slowdown period decreased by an area‐averaged mean of 41% for the three analysis boxes. The retrieved contrail optical properties were mostly similar for both periods. Total shortwave contrail radiative forcings (CRFs) during the slowdown were 34% and 42% smaller for Terra and Aqua, respectively. The corresponding differences for longwave CRF were 33% for Terra and 40% for Aqua. To account for the impact of any changes in the atmospheric environment between baseline and slowdown periods on detected CC amounts, the contrail formation potential (CFP) was computed from reanalysis data. In addition, a filtered CFP (fCFP) was also developed to account for factors that may affect contrail formation and visibility of persistent contrails in satellite imagery. The CFP and fCFP were combined with air traffic data to create empirical models that estimated CC during the baseline and slowdown periods and were compared to the detected CC. The models confirm that decreases in CC and radiative forcing during the slowdown period were mostly due to the reduction in air traffic, and partly due to environmental changes.Alternate :Plain Language SummaryContrails produced by aircraft flying in cold but humid air both warm the atmosphere by reducing infrared radiation emitted back into space and cool it by increasing reflected sunlight. Due to the decrease in air traffic during the first months of the COVID pandemic, fewer satellite‐detectable contrails were produced compared to pre‐pandemic times, and thus the radiative effects of contrails were also diminished. But changes in the overall temperature and humidity at aircraft cruise altitudes also affect contrail formation and might explain at least some of the observed decrease in contrail coverage during April and May 2020. Analysis of satellite imagery showed that the thickness and ice‐crystal size of the contrails during the COVID period did not change much from pre‐pandemic contrails. The regional contrail coverage was accurately simulated from a combination of the estimated air traffic activity at cruise altitude and the probable frequency of when atmospheric conditions were favorable for contrail formation. This simulation confirms that most of the decrease in contrails and their radiative effects during the COVID‐related slowdown period were due to the reduction in air traffic, and to a lesser extent to changes in temperature and humidity at cruise altitude during April and May 2020.

9.
Multiple sclerosis and related disorders ; 71:104282-104282, 2023.
Article in English | EuropePMC | ID: covidwho-2255526

ABSTRACT

Introduction B-cell-depleting therapies may affect the development of a protective immune response following vaccination against SARS-CoV-2. It is important to have a different strategy for creating immunity. Evusheld (tixagevimab co-packaged with cilgavimab) is currently approved by the FDA under an emergency use authorization (EUA) for use in patients who are not able to mount an immune response to the COVID-19 vaccines. No study has been undertaken to evaluate its efficacy in people with MS. The objective of this study was to evaluate whether Evusheld (tixagevimab co-packaged with cilgavimab) affects the antibody response to SARS-CoV-2 following an existing attenuated response to the vaccines against SARS-CoV-2. Material(s) and Method(s) This was a single-center cohort study performed at Methodist Hospitals in Merrillville, IN, USA. It included patients with multiple sclerosis treated with ocrelizumab and ofatumumab. Patients had already received the mRNA vaccinations against SARS-CoV-2 and had demonstrated an attenuated response on antibody testing. All participants received 150mg of Evusheld (tixagevimab co-packaged with cilgavimab). Antibody levels were measured at least two weeks following Evusheld injections. Result(s) All patients (100%) developed the highest level of antibodies possible at least two weeks following Evusheld injections. Conclusion(s) In this study, patients with MS who had an attenuated antibody response to the COVID-19 vaccines due to exposure to b-cell depleters now had the highest antibody response possible after receiving Evusheld. This is important as it provides a different strategy for protection against COVID-19.

10.
Dissertation Abstracts International Section A: Humanities and Social Sciences ; 84(4-A):No Pagination Specified, 2023.
Article in English | APA PsycInfo | ID: covidwho-2255326

ABSTRACT

When schools across the United States suspended in-person instruction in an attempt to mitigate the spread of what would become the Covid-19 pandemic, many school districts implemented continuity of education plans that relied on the use of technology. This sudden shift in the method of delivering education has the potential to have lasting impacts on how technology is used in schools. As the primary instructional leader and technology leader, the school principal is responsible for guiding their school through the change process. With the ISTE Standards for Education Leaders as a conceptual framework, this mixed methods study utilized an explanatory sequential approach to investigate the current levels of high school principal technology leadership in Southeast Pennsylvania and explore how the Covid-19 pandemic has impacted principal technology leadership. The quantitative data was collected by administering the Education Leaders Technology Survey instrument to 35 participants, and the qualitative data was collected through semi-structured interviews with 10 participants. Results indicated that there is a positive correlation among each of the technology leadership behaviors and activities outlined in the ISTE Standards, with the highest levels in the areas of empowering leader and visionary planner. There was not a significant difference in principals' technology leadership based on demographics except for school location. Principals in urban schools reported significantly higher levels of visionary planner than those in suburban and rural schools. Principals in urban schools also reported significantly higher levels of connected learner and systems designer than those in suburban locations. The qualitative data analysis indicated that schools increased their focus in the area of empowering leader and visionary planner since the pandemic and that principals' technology leadership significantly shifted toward empowering leader with increases also evident in the areas of visionary planner, systems designer, and connected learner. Further implications of this study include the need to increase professional growth in the area of connected learner and to emphasize the principal's role as a systems designer and an empowering leader who promotes teacher leadership and agency. (PsycInfo Database Record (c) 2023 APA, all rights reserved)

11.
Development and Learning in Organizations ; 37(2):14-17, 2023.
Article in English | ProQuest Central | ID: covidwho-2282566

ABSTRACT

PurposeThis article presents findings from a recent study that examined award-winning digital principals. Findings are summarized with regard to the preparation and practice of school administrators.Design/methodology/approachThe participants in the research study were 12 U.S. principals recognized for their digital principal leadership. The researchers interviewed the leaders to better understand the challenges and opportunities of being an innovative principal.FindingsDigital principals engage their teachers in professional development in a differentiated manner rather than a ‘one size fits all' approach. They are resourceful advocates for infrastructure upgrades and curriculum change. They are actively involved in professional networks that extend beyond their school walls. These principals empower teachers as leaders within and outside of their school. Finally, they helped tell the story of their school culture in unique ways.Originality/valueWith the onset of the pandemic, principal leadership has changed. Organizations can learn from innovative principals in this work and incorporate it into their preparation, professional development, and evaluation practices. School building leaders must emerge from the pandemic equipped to proactively lead the new normal of technology-savvy leadership opportunities.

12.
Aust N Z J Public Health ; 47(2): 100019, 2023 Apr.
Article in English | MEDLINE | ID: covidwho-2256364

ABSTRACT

OBJECTIVE: To describe changes in palliative care characteristics, utilisation and outcomes in Victoria during a period of enhanced public health management and a prolonged lockdown due to coronavirus disease 2019. METHODS: A national retrospective cohort study with palliative care service setting comparisons in Victoria and other mainland states was conducted. RESULTS: Analysis of 48 non-Victorian services (n=53,428 patients) and 20 Victorian services (n=31,125 patients) showed that for community services, patient volume, average length of stay, functional dependency and the proportion of admissions in a deteriorating phase increased during the lockdown in Victoria, yet little changed in comparator states. Regarding inpatient services, the management of family/carer problems remained constant in comparator states, yet substantial fluctuations in outcomes in Victoria were observed. CONCLUSIONS: As health systems adapt to changing circumstances during the pandemic, the ability to upscale community services is critical. Addressing the implications of shifting inpatient care to the community needs attention. IMPLICATIONS FOR PUBLIC HEALTH: Our study highlights the need to ensure community care providers are adequately considered within public health management responses. 'Joined up' policy and implementation across care settings are essential, especially as major barriers to infection control and increased utilisation may be evident in the community during the coronavirus disease 2019 pandemic.


Subject(s)
COVID-19 , Community Health Services , Palliative Care , Humans , Communicable Disease Control , COVID-19/epidemiology , Public Health , Retrospective Studies , Health Policy , Pandemics
13.
Nanomedicine ; 48: 102654, 2023 02.
Article in English | MEDLINE | ID: covidwho-2181759

ABSTRACT

Solutions containing Ag0 nanoclusters, Ag+1, and higher oxidation state silver, generated from nanocrystalline silver dressings, were anti-inflammatory against porcine skin inflammation. The dressings have clinically-demonstrated broad-spectrum antimicrobial activity, suggesting application of nanosilver solutions in treating pulmonary infection. Nanosilver solutions were tested for antimicrobial efficacy; against HSV-1 and SARS-CoV-2; and nebulized in rats with acute pneumonia. Patients with pneumonia (ventilated), fungal sinusitis, burns plus COVID-19, and two non-hospitalized patients with COVID-19 received nebulized nanosilver solution. Nanosilver solutions demonstrated pH-dependent antimicrobial efficacy; reduced infection and inflammation without evidence of lung toxicity in the rat model; and inactivated HSV-1 and SARS-CoV-2. Pneumonia patients had rapidly reduced pulmonary symptoms, recovering pre-illness respiratory function. Fungal sinusitis-related inflammation decreased immediately with infection clearance within 21 days. Non-hospitalized patients with COVID-19 experienced rapid symptom remission. Nanosilver solutions, due to anti-inflammatory, antiviral, and antimicrobial activity, may be effective for treating respiratory inflammation and infections caused by viruses and/or microbes.


Subject(s)
COVID-19 , Pneumonia , Sinusitis , Rats , Animals , Swine , COVID-19/complications , SARS-CoV-2 , Silver/therapeutic use , Inflammation/drug therapy , Pneumonia/drug therapy , Anti-Inflammatory Agents/therapeutic use , Sinusitis/complications , Sinusitis/drug therapy
14.
BMJ Open ; 13(1): e064266, 2023 01 18.
Article in English | MEDLINE | ID: covidwho-2193778

ABSTRACT

OBJECTIVES: The rapid onset and progressive course of the COVID-19 pandemic challenged primary care practices to generate rapid solutions to unique circumstances, creating a natural experiment of effectiveness, resilience, financial stability and governance across primary care models. We aimed to characterise how practices in Melbourne, Australia modified clinical and organisational routines in response to the pandemic in 2020-2021 and identify factors that influenced these changes. DESIGN: Prospective, qualitative, participatory case study design using constant comparative data analysis, conducted between April 2020 and February 2021. Participant general practitioner (GP) investigators were involved in study design, recruitment of other participants, data collection and analysis. Data analysis included investigator diaries, structured practice observation, documents and interviews. SETTING: The cases were six Melbourne practices of varying size and organisational model. PARTICIPANTS: GP investigators approached potential participants. Practice healthcare workers were interviewed by social scientists on three occasions, and provided feedback on presentations of preliminary findings. RESULTS: We conducted 58 interviews with 26 practice healthcare workers including practice owners, practice managers, GPs, receptionists and nurses; and six interviews with GP investigators. Data saturation was achieved within each practice and across the sample. The pandemic generated changes to triage, clinical care, infection control and organisational routines, particularly around telehealth. While collaboration and trust increased within several practices, others fragmented, leaving staff isolated and demoralised. Financial and organisational stability, collaborative problem solving, creative leadership and communication (internally and within the broader healthcare sector) were major influences on practice ability to negotiate the pandemic. CONCLUSIONS: This study demonstrates the complex influences on primary care practices, and reinforces the strengths of clinician participation in research design, conduct and analysis. Two implications are: telehealth, triage and infection management innovations are likely to continue; the existing payment system provides inadequate support to primary care in a global pandemic.


Subject(s)
COVID-19 , General Practice , General Practitioners , Humans , COVID-19/epidemiology , Pandemics , Prospective Studies , Australia
15.
Journal of European Public Policy ; : 1-27, 2023.
Article in English | Taylor & Francis | ID: covidwho-2187359
17.
Subst Use Misuse ; 58(1): 139-145, 2023.
Article in English | MEDLINE | ID: covidwho-2160641

ABSTRACT

Background: The Twelve Steps described by Narcotics Anonymous (NA) and Alcoholics Anonymous denote key aspects of how members can achieve abstinence from alcohol and other drugs. However, there are limited empirical findings on what long-term members rely on to support their ongoing recovery.Method: In order to clarify the members' reliance on those latter resources, we surveyed 2,293 long-term NA members through the internet on items they rely on for their recovery. They scored nine NA-related resources (e.g., their sponsor) and three non-NA institutional ones (e.g., a professional therapist).Results: Three factors accounted for 53.6% of the variance in the respondents' scores of the 12 items. We labeled them, with the percent of variance accorded, as NA-based social (24.9%) support, spiritual (17.8%) support, and outside professional (10.9%) help. While NA-based resources ranked highest, outside resources (a house of worship, a therapist, or medications for psychological distress) were scored by 75.4% of the respondents. Analysis by subgroups of respondents reflected the diversity of resources members draw on. The use of internet-based meetings during the COVID-19 period reflected the resilience of the NA format.Conclusion: Members of Twelve Step programs can be studied to shed light on options that they rely on for support for their ongoing recovery, both within the fellowships and outside them. Long-term members can apparently rely on resources inside the fellowship and simultaneously on professional ones, as well. These findings can be helpful for researchers in considering mechanisms that underlie long-term Twelve Step-related recovery and for clinicians in employing both these fellowships and outside resources as adjuncts to their professional care.


Subject(s)
Alcoholism , COVID-19 , Humans , Fellowships and Scholarships , Alcoholics Anonymous , Surveys and Questionnaires , Alcoholism/psychology
18.
Nature ; 599(7883): 114-119, 2021 11.
Article in English | MEDLINE | ID: covidwho-2114880

ABSTRACT

The B.1.617.2 (Delta) variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first identified in the state of Maharashtra in late 2020 and spread throughout India, outcompeting pre-existing lineages including B.1.617.1 (Kappa) and B.1.1.7 (Alpha)1. In vitro, B.1.617.2 is sixfold less sensitive to serum neutralizing antibodies from recovered individuals, and eightfold less sensitive to vaccine-elicited antibodies, compared with wild-type Wuhan-1 bearing D614G. Serum neutralizing titres against B.1.617.2 were lower in ChAdOx1 vaccinees than in BNT162b2 vaccinees. B.1.617.2 spike pseudotyped viruses exhibited compromised sensitivity to monoclonal antibodies to the receptor-binding domain and the amino-terminal domain. B.1.617.2 demonstrated higher replication efficiency than B.1.1.7 in both airway organoid and human airway epithelial systems, associated with B.1.617.2 spike being in a predominantly cleaved state compared with B.1.1.7 spike. The B.1.617.2 spike protein was able to mediate highly efficient syncytium formation that was less sensitive to inhibition by neutralizing antibody, compared with that of wild-type spike. We also observed that B.1.617.2 had higher replication and spike-mediated entry than B.1.617.1, potentially explaining the B.1.617.2 dominance. In an analysis of more than 130 SARS-CoV-2-infected health care workers across three centres in India during a period of mixed lineage circulation, we observed reduced ChAdOx1 vaccine effectiveness against B.1.617.2 relative to non-B.1.617.2, with the caveat of possible residual confounding. Compromised vaccine efficacy against the highly fit and immune-evasive B.1.617.2 Delta variant warrants continued infection control measures in the post-vaccination era.


Subject(s)
Immune Evasion , SARS-CoV-2/growth & development , SARS-CoV-2/immunology , Virus Replication/immunology , Antibodies, Neutralizing/immunology , COVID-19 Vaccines/immunology , Cell Fusion , Cell Line , Female , Health Personnel , Humans , India , Kinetics , Male , Spike Glycoprotein, Coronavirus/metabolism , Vaccination
19.
iScience ; 25(11): 105316, 2022 Nov 18.
Article in English | MEDLINE | ID: covidwho-2061301

ABSTRACT

The severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) spike glycoprotein (S) binds to angiotensin-converting enzyme 2 (ACE2) to mediate membrane fusion via two distinct pathways: 1) a surface, serine protease-dependent or 2) an endosomal, cysteine protease-dependent pathway. In this study, we found that SARS-CoV-2 S has a wider protease usage and can also be activated by TMPRSS13 and matrix metalloproteinases (MMPs). We found that MMP-2 and MMP-9 played roles in SARS-CoV-2 S cell-cell fusion and TMPRSS2- and cathepsin-independent viral entry in cells expressing high MMP levels. MMP-dependent viral entry required cleavage at the S1/S2 junction in viral producer cells, and differential processing of variants of concern S dictated its usage; the efficiently processed Delta S preferred metalloproteinase-dependent entry when available, and less processed Omicron S was unable to us metalloproteinases for entry. As MMP-2/9 are released during inflammation, they may play roles in S-mediated cytopathic effects, tropism, and disease outcome.

20.
Clin Infect Dis ; 75(Supplement_2): S231-S235, 2022 Oct 03.
Article in English | MEDLINE | ID: covidwho-2051337

ABSTRACT

The highly transmissible severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant led to increased hospitalizations, staffing shortages, and increased school closures. To reduce spread in school-aged children during the Omicron peak, the District of Columbia implemented a test-to-return strategy in public and public charter schools after a 2-week break from in-person learning.


Subject(s)
COVID-19 , Child , District of Columbia , Humans , SARS-CoV-2 , Schools
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