Covid-19 Sentry

Contents

• From Preprints
• From Clinical Trials
• From PubMed
• From Patent Search

From Preprints

• Awareness of the COVID-19 cases in personal network and students’ motivation to engage in protective behaviour -
  In the beginning of COVID-19 pandemic young people were believed to be less vulnerable to the disease. The study aimed to explore what motivated youth to comply with recommended preventive behaviour while being in a relatively safe position. Utilising self-reported data from 1,265 students in the beginning of the pandemic we applied structural equation modelling to explore the role of different motivation types (self-interested, prosocial and controlled) in predicting the adherence to a wide range of protective behaviours. We have also explored how the awareness of COVID cases in personal network was associated with perceived risks, motivation and behavioural response to pandemic. Overall among all types of motivation the prosocial one (to protect significant others or to stop spreading disease) better explains all types of protective behaviours. In line with this finding perceived personal risks were less associated with the protective behaviour than motivation variables. Controlled motivation (to comply with external requirements) for the young group was the least significant in predicting behaviour. The independent factor which affects both perceived risks, motivation to comply and preventive behaviour is the presence of the known COVID-19 cases in people’s social network. However, while awareness about severe outcomes positively affects those outcomes, awareness about the mild cases in contrast could decrease the perceived threat of disease and motivation. Our findings highlight that prosocial motivation might be a promising way to engage young people in preventive behaviour as well as the importance for cautiously presenting narrative information about disease outcomes for this audience.
  🖺 Full Text HTML: Awareness of the COVID-19 cases in personal network and students’ motivation to engage in protective behaviour
• The Equilibrium and Pandemic Waves of COVID-19 in the US -

  Importance: Removing the epidemic waves and reducing the instability level of an endemic critical point of COVID-19 dynamics are fundamental to the control of COVID-19 in the US. Objective: To develop new mathematic models and investigate when and how will the COVID-19 in the US be evolved to endemic. Design, Setting, and Participants: To solve the problem of whether mass vaccination against SARS-CoV-2 will ultimately end the COVID-19 pandemic, we defined a set of nonlinear ordinary differential equations as a mathematical model of transmission dynamics of COVID-19 with vaccination. Multi-stability analysis was conducted on the data for the daily reported new cases of infection from January 12, 2021 to December 12, 2022 across 50 states in the US using the developed dynamic model of COVID-19 and limit cycle theory. Main Outcomes and Measures: Eigenvalues and the reproduction number under the disease-free equilibrium point and endemic equilibrium point were used to assess the stability of the disease-free equilibrium point and endemic equilibrium point. Both analytic analysis and numerical methods were used to determine the instability level of new cases of COVID-19 in the US under the different types of equilibrium points and to investigate how the system moves back and forth between stable and unstable states of the system and how the pandemic COVD-19 will evolve to endemic in the US. Results: Multi-stability analysis identified two types of critical equilibrium points, disease-free endemic equilibrium points in the COVID-19 transmission dynamic system. The transmissional, recovery, vaccination rates and vaccination effectiveness during the major transmission waves of COVID-19 across 50 states in the US were estimated. These parameters in the model varied over time and across the 50 states. The eigenvalues and the reproduction numbers R₀ and R₀^end in the disease-free equilibrium point and endemic equilibrium point were estimated to assess stability and classify equilibrium points. They also varied from state to state. The impacts of the transmission and vaccination parameters on the stability of COVID-19 were simulated, and stability attractor regions of these parameters were found and ranked for all 50 states in the US. The US experienced five major epidemic waves, endemic equilibrium points of which across 50 states were all in unstable states. However, the combination of re-infection and vaccination (hybrid immunity) may provide strong protection against COVID-19 infection, and stability analysis showed that these unstable equilibrium points were toward stable points. Theoretical analysis and real data analysis showed that additional epidemic waves may be possible in the future, but COVID-19 across all 50 sates in the US is rapidly moving toward stable endemicity. Conclusions and Relevance: Both stability analysis and observed epidemic waves in the US indicated that the pandemic might not end with the disappearance of the virus. However, after enough people gained immune protection from vaccination and from natural infection, COVID-19 would become an endemic disease, as the stability analysis showed. Educating the population about multiple epidemic waves of the transmission dynamics of COVID-19 and designing optimal vaccine rollout are crucial for controlling the pandemic of COVID-19 and its evolving to endemic.

  🖺 Full Text HTML: The Equilibrium and Pandemic Waves of COVID-19 in the US
• Longitudinal dynamics of Streptococcus pneumoniae carriage and SARS-CoV-2 infection in households with children. -

  Background: To characterize interferences between Streptococcus pneumoniae and SARS-CoV-2 we investigated the longitudinal patterns of viral infection and pneumococcal carriage in households infected with SARS-CoV-2. Methods: SARS-CoV-2 and pneumococcus were detected with quantitative molecular methods in saliva from members of eighty participating households. Samples were collected between October 2020 and January 2021 from n=197 adults and n=118 children of which n=176 adults and n=98 children had a complete set of ten samples collected within 42 days since enrolment. Time-dependent Cox models were used to evaluate the associations between SARS-CoV-2 and pneumococcal carriage. Results: In the entire cohort, cumulative pneumococcal carriage and SARS-CoV-2 infection rates were 58% and 65%, respectively. Pneumococcal abundances were associated with an increased risk of SARS-CoV-2 infection (HR 1.14, 95% CI, 1.01-1.29, P=0.04) and delayed clearance of SARS-CoV-2 infection (HR 0.90, 95% CI, 0.82-0.99, P=0.03). Elevated viral loads were observed among pneumococcal carriers and individuals with high overall bacterial 16S abundances, however, there were no longitudinal differences in viral loads in linear mixed-effects models. Individuals with high 16S abundances displayed delayed viral clearance (HR 0.65, 95% CI 0.55-0.78, P<0.0001). Conclusions: Although we found insufficient evidence for a strong impact of SARS-CoV-2 infection on pneumococcal carriage. Results from the current study suggest that pneumococcal carriers may have an increased risk of SARS-CoV-2 infection and high pneumococcal abundances and 16S abundances may be associated with elevated viral loads and delayed clearance of SARS-CoV-2 infection.

  🖺 Full Text HTML: Longitudinal dynamics of Streptococcus pneumoniae carriage and SARS-CoV-2 infection in households with children.
• Targeting the MR1-MAIT Cell Axis Improves Vaccine Efficacy and Affords Protection against Viral Pathogens -
  Mucosa-associated invariant T (MAIT) cells are MR1-restricted, innate-like T lymphocytes with tremendous antibacterial and immunomodulatory functions. MAIT cells also sense and respond to viral infections in an MR1-independent fashion. However, whether they can be directly targeted in immunization strategies against viral pathogens is unknown. We addressed this question in multiple wild-type and genetically altered but clinically relevant mouse strains using several vaccine platforms against influenza viruses, poxviruses and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). We demonstrate that 5-(2-oxopropylideneamino)-6-D-ribitylaminouracil (5-OP-RU), a riboflavin-based MR1 ligand of bacterial origin, can synergize with viral vaccines to expand MAIT cells in multiple tissues, reprogram them towards a pro-inflammatory MAIT1 phenotype, license them to bolster mainstream virus-specific CD8+ T cell responses, and potentiate heterosubtypic antiviral protection. Repeated 5-OP-RU administration did not render MAIT cells anergic, thus allowing for its inclusion in prime-boost immunization protocols. Mechanistically, tissue MAIT cell accumulation was due to their robust proliferation, as opposed to altered migratory behavior, and required viral vaccine replication competency, Toll-like receptor 3 (TLR3) and cell-autonomous type I interferon receptor signaling. Furthermore, the observed phenomenon was manifest in young and old female and male mice, and could also be recapitulated in a human cell culture system in which peripheral blood mononuclear cells were exposed to replicating virions and 5-OP-RU. In conclusion, although viruses and virus-based vaccines are devoid of the riboflavin biosynthesis machinery that supplies MR1 ligands, targeting MR1 enhances the efficacy of vaccine-elicited antiviral immunity. We propose 5-OP-RU as a non-classic but potent and versatile vaccine adjuvant against respiratory viruses.
  🖺 Full Text HTML: Targeting the MR1-MAIT Cell Axis Improves Vaccine Efficacy and Affords Protection against Viral Pathogens
• Recognition and Cleavage of Human tRNA Methyltransferase TRMT1 by the SARS-CoV-2 Main Protease -
  The SARS-CoV-2 main protease (Mpro) plays a crucial role in the production of functional viral proteins during infection and, like many viral proteases, can also target and cleave host proteins to subvert their cellular functions. Here, we show that the human tRNA methyltransferase TRMT1 can be recognized and cleaved by SARS-CoV-2 Mpro. TRMT1 installs the N2,N2-dimethylguanosine (m2,2G) modification at the G26 position of mammalian tRNA, which promotes global protein synthesis, cellular redox homeostasis, and has links to neurological disability. We find that Mpro can cleave endogenous TRMT1 in human cell lysate, resulting in removal of the TRMT1 zinc finger domain that is required for tRNA modification activity in cells. Evolutionary analysis shows that the TRMT1 cleavage site is highly conserved in mammals, except in Muroidea, where TRMT1 may be resistant to cleavage. In primates, regions outside of the cleavage site with rapid evolution could indicate possible adaptation to ancient viral pathogens. To visualize how Mpro recognizes the TRMT1 cleavage sequence, we determined the structure of a TRMT1 peptide in complex with Mpro, which reveals a substrate binding conformation distinct from the majority of available SARS-CoV-2 Mpro-peptide complexes. Kinetic parameters for peptide cleavage showed that while TRMT1(526-536) is cleaved much slower than the Mpro nsp4/5 autoprocessing sequence, it is proteolyzed with comparable efficiency to the Mpro-targeted nsp8/9 viral cleavage site. Mutagenesis studies and molecular dynamics simulations together indicate that kinetic discrimination occurs during a later step of Mpro-mediated proteolysis that follows substrate binding. Our results provide new information about the structural basis for Mpro substrate recognition and cleavage that could help inform future therapeutic design and raise the possibility that proteolysis of human TRMT1 during SARS-CoV-2 infection may impact protein translation or oxidative stress response and contribute to viral pathogenesis.
  🖺 Full Text HTML: Recognition and Cleavage of Human tRNA Methyltransferase TRMT1 by the SARS-CoV-2 Main Protease
• Efficient Viral Capture and Inactivation from Bioaerosols Using Electrostatic Precipitation. -
  The presence of infectious viral particles in bioaerosols generated during laparoscopic surgery places surgical staff at significant risk of infection and represents a major cause of nosocomial infection. These factors contributed to the postponement and cancellation of countless surgical procedures during the early stages of the ongoing COVID-19 pandemic, causing backlogs, increased waiting times for surgical procedures and excess deaths indirectly related to the pandemic. The development and implementation of devices that effectively inactivate viral particles from bioaerosols would be beneficial in limiting or preventing the spread of infections from such bioaerosols. Here, we sought to evaluate whether electrostatic precipitation (EP) is a viable means to capture and inactivate both non-enveloped (Adenovirus) and enveloped (SARS-CoV-2 Pseudotyped Lentivirus) viral particles present in bioaerosols. We developed a closed-system model to mimic the release of bioaerosols during laparoscopic surgery. Known concentrations of each virus were aerosolised into the model system, exposed to EP using a commercially available system (UltravisionTM, Alesi Surgical Limited, UK) and collected in a BioSampler for analysis. Using qPCR to quantify viral genomes and transduction assays to quantify biological activity, we show that both enveloped and non-enveloped viral particles were efficiently captured and inactivated by EP. Both capture and inactivation could be further enhanced when increasing the voltage to 10kV, or when using two UltravisionTM discharge electrodes together at 8kV. This study highlights EP as an efficient means for capturing and inactivating viral particles present in bioaerosols. The use of EP may limit the spread of diseases, reducing nosocomial infections and potentially enable the continuation of surgical procedures during periods of viral pandemics.
  🖺 Full Text HTML: Efficient Viral Capture and Inactivation from Bioaerosols Using Electrostatic Precipitation.
• Single shot dendritic cell targeting SARS-CoV-2 vaccine candidate induces broad and durable systemic and mucosal immune responses -
  Current COVID-19 vaccines face certain limitations, which include waning immunity, immune escape by SARS-CoV-2 variants, limited CD8+ cellular response, and poor induction of mucosal immunity. Here, we engineered a Clec9A-RBD antibody construct that delivers the Receptor Binding Domain (RBD) from SARS-CoV-2 spike protein to conventional type 1 dendritic cells (cDC1). We showed that single dose immunization with Clec9A-RBD induced high RBD-specific antibody titers with a strong T-helper 1 (TH1) isotype profile and exceptional durability, whereby antibody titers were sustained for at least 21 months post-vaccination. Uniquely, affinity maturation of the antibody response was observed over time, as evidenced by enhanced neutralization potency and breadth across the sarbecovirus family. Consistently and remarkably, RBD-specific T-follicular helper cells and germinal center B cells were still detected at 12 months post-immunization. Increased antibody-dependent cell-mediated cytotoxicity (ADCC) activity of the immune sera was also measured over time with comparable efficacy against ancestral SARS-CoV-2 and variants, including Omicron. Furthermore, Clec9A-RBD immunization induced a durable poly-functional TH1-biased cellular response that was strongly cross-reactive against SARS-CoV-2 variants, including Omicron, and with robust CD8+ T cell signature. Lastly, Clec9A-RBD single dose systemic immunization primed effectively RBD-specific cellular and humoral mucosal immunity in lung. Taken together, Clec9A-RBD immunization has the potential to trigger robust and sustained, systemic and mucosal immune responses against rapidly evolving SARS-CoV2 variants.
  🖺 Full Text HTML: Single shot dendritic cell targeting SARS-CoV-2 vaccine candidate induces broad and durable systemic and mucosal immune responses
• Gambling on Others’ Health: Risky Pro-social Decision-Making in the Era of Covid19 -
  How does cost and uncertainty shape an ordinary person’s action towards a stranger’s wellbeing? During the Covid19 pandemic, individuals were asked to perform costly actions to reduce harm to strangers, even while the general population, including authorities and experts, grappled with the uncertainty surrounding the novel virus. Many researches have examined health decision-making by experts, but the study of lay, non-expert, individuals decision-making on a stranger’s health has been left to the wayside, as ordinary citizens are usually not tasked with such decisions. We sought to capture a snapshot of this specific choice behavior by administering two surveys to the general population in the early days of the Covid-19 pandemic. We presented respondents with hypothetical diseases of variable severity affecting either oneself, a beloved person or a stranger. Participants had to choose between treatments who could either lead to a certain mild improvement (sure option) or cure entirely the effected person at a given probability (risky option). Respondents preferred risky options overall, but their risk-seeking attitude decreased progressively the higher the expected severity of the disease. This pattern was observed regardless of the identity of recipient. Instead, distinctions between targets emerged when decisions were conditioned on treatment cost, with participants preferring cheaper options for strangers. Overall, these findings provide a descriptive model of individual risky decision-making for others; and inform on the limits of what can be asked of an individual in service to a stranger.
  🖺 Full Text HTML: Gambling on Others’ Health: Risky Pro-social Decision-Making in the Era of Covid19
• Corticosteroids are the Best Treatment for COVID-19 -
  ACTH autoantibodies are commonly induced by pathogens. Corticosteroid supplements are an effective and necessary treatment to ameliorate the acute and chronic signs and symptoms caused by these autoantibodies. Properly treating COVID-19 infections with corticosteroids will save lives and reduce suffering.
  🖺 Full Text HTML: Corticosteroids are the Best Treatment for COVID-19
• Intrinsic and effective severity of COVID-19 cases infected with the ancestral strain and Omicron BA.2 variant in Hong Kong -

  Background: Understanding severity of infections with SARS-CoV-2 and its variants is crucial to inform public health measures. Here we used COVID-19 patient data from Hong Kong to characterise the severity profile of COVID-19 and to examine factors associated with fatality of infection. Methods: Time-varying and age-specific effective severity measured by case-hospitalization risk and hospitalization risk was estimated with all individual COVID-19 case data collected in Hong Kong from 23 January 2020 through to 26 October 2022 over six epidemic waves, in comparison with estimates of influenza A(H1N1)pdm09 during the 2009 pandemic. The intrinsic severity of Omicron BA.2 was compared with the estimate for the ancestral strain with the data from unvaccinated patients without previous infections. Factors potentially associated with the fatality risk of hospitalized Omicron patients were also examined. Results: With 32,222 COVID-19 hospitalizations and 9,669 deaths confirmed over 6 epidemic waves in Hong Kong, the time-varying hospitalization fatality risk dramatically increased from below 10% before the largest fifth wave of Omicron BA.2, to 41% during the peak of the fifth wave when hospital resources were severely constrained. The age-specific fatality risk in unvaccinated hospitalized Omicron cases was comparable to the estimates for unvaccinated cases with the ancestral strain. During epidemics predominated by Omicron BA.2, the highest fatality risk was amongst unvaccinated patients aged ≥80 years and the risk was inversely associated with the number of vaccination doses received. Conclusions: Omicron has comparable intrinsic severity to the ancestral Wuhan strain although the effective severity is substantially lower in Omicron cases due to vaccination. With a moderate-to-high coverage of vaccination, hospitalized COVID-19 patients caused by Omicron subvariants appeared to have similar age-specific risks of fatality to patients hospitalized with influenza A(H1N1)pdm09.

  🖺 Full Text HTML: Intrinsic and effective severity of COVID-19 cases infected with the ancestral strain and Omicron BA.2 variant in Hong Kong
• Athlete deaths during the COVID-19 vaccination campaign: contextualisation of online information -

  Background and aim: Lay people and medical professionals have suggested a link between (mRNA) COVID-19 vaccination and a purported increase in sudden cardiac arrest (SCA) and death (SCD) among athletes. We aimed to compare the athlete death rate in 2021-2022 with pre-pandemic estimates and investigate the role of vaccination. Methods: A comprehensive, much referenced, publicly available list of health issues, emergencies, and SCA/SCD in athletes from January 2021 to December 2022 was analysed. Demographic data, country, type of sport, vaccination status, and possible association between reported medical events and vaccination were evaluated for the complete set of athletes. The following data were specifically assessed for cases of SCD in young US athletes and compared to matched data from pre-pandemic studies: average annual SCD number, mean age, male/female ratio, sports with highest death toll, cause and scene of death, and relation to exercise. Descriptive statistics were used. Results: The list contained 1653 entries. (Former) athletes, aged 5-86 years, from 99 countries, participated in 61 different sports. In multiple cases, causes of and circumstances surrounding medical events were irretrievable. Many cases involved non-cardiovascular, exercise-unrelated aetiologies. Vaccination details were scarce. In 63 (3.8%) cases, including 9 fatal events, there was a plausible association with COVID-19 vaccination. In US athletes aged 9-40 (mean 22.7) years, 166 SCD cases were identified (average 83/year), mainly in males (83%) and in football (39.8%) and basketball (16.9%). Main causes of death were non-cardiovascular exercise-unrelated (22.9%) or unknown (50.6%). Deaths primarily occurred at rest (32.5%) or under unknown circumstances (38.6%). SCD characteristics were similar to those of two pre-pandemic studies with comparable datasets. Conclusion: SCD rate among young US athletes in 2021-2022 was comparable to pre-pandemic estimates. There is currently no evidence to substantiate a link between (mRNA) COVID-19 vaccination and SCD in (young) athletes.

  🖺 Full Text HTML: Athlete deaths during the COVID-19 vaccination campaign: contextualisation of online information
• Poor sleep quality, insomnia, and short sleep duration before infection predict long-term symptoms after COVID-19 -

  Study objectives: Millions of COVID-19 survivors experience a wide range of long-term symptoms after acute infection, giving rise to serious public health concerns. To date, few risk factors for post-COVID-19 conditions have been determined. This study evaluated the role of pre-infection sleep quality/duration and insomnia severity in the incidence of long-term symptoms after COVID-19. Methods: This prospective study involved two assessments (April 2020 and 2022). At baseline, sleep quality/duration and insomnia symptoms in participants without current/prior SARS-CoV-2 infection were measured using the Pittsburgh Sleep Quality Index (PSQI) and the Insomnia Severity Index (ISI). At follow-up, we evaluated the presence of twenty-one symptoms (psychiatric, neurological, cognitive, bodily, and respiratory) one month (n=713, infection in April 2020-February 2022) and three months after COVID-19 (n=333, infection in April 2020-December 2021). Zero-inflated negative binomial models were used to estimate the effect of previous sleep on the number of long-term symptoms. Binomial logistic regressions were performed to evaluate the association between sleep outcomes and the incidence of each post-COVID-19 symptom. Results: Analyses highlighted a significant effect of pre-infection sleep on the number of symptoms one/three months after COVID-19. Previous higher PSQI and ISI scores, and shorter sleep duration significantly increased the risk of almost every long-term symptom at one/three months from COVID-19. Conclusion: This study suggested a prospective dose-dependent association between pre-infection sleep quality/quantity and insomnia severity with the manifestation of post-COVID-19 symptoms. Promoting sleep health may represent an effective preventive approach to mitigate the COVID-19 sequelae, with substantial public health and societal implications.

  🖺 Full Text HTML: Poor sleep quality, insomnia, and short sleep duration before infection predict long-term symptoms after COVID-19
• A third vaccine dose equalizes the levels of effectiveness and immunogenicity of heterologous or homologous COVID-19 vaccine regimens -

  Background: To cope with the persistence of the Covid-19 epidemic and the decrease in antibody levels following vaccination, a third dose of vaccine has been recommended in the general population. However, several vaccine regimens had been used initially, and the heterologous ChadOx1-S/BNT162b2 regimen had shown better efficacy and immunogenicity than the homologous BNT162b2/BNT162b2 regimen. Aim : We wanted to determine if this benefit was retained after the third dose. Methods: We combined an observational study of SARS-COV-2 infections among vaccinated healthcare workers at the University-Hospital of Lyon, France, with an analysis of immunological parameters before and after the third mRNA vaccine dose. Results: Following the second vaccine dose, heterologous vaccination regimens were more protective against infection than homologous regimens, but this was no longer the case after the third dose. RBD-specific IgG levels and serum neutralization capacity against different SARS-CoV-2 variants were higher after the third dose than after the second dose in the homologous regimen group, but not in the heterologous group. Conclusion: The advantage conferred by heterologous vaccination is lost after the third dose in terms of both protection and immunogenicity. Immunological measurements one month after vaccination suggest that heterologous vaccination induces maximal immunity after the second dose, whereas the third dose is required to reach the same level in individuals with a homologous regimen.

  🖺 Full Text HTML: A third vaccine dose equalizes the levels of effectiveness and immunogenicity of heterologous or homologous COVID-19 vaccine regimens
• A Systematic Review on Medical Oxygen Ecosystem: Current State and Recent Advancements -

  Background: Medical oxygen is an essential component of modern healthcare, with a wide variety of applications ranging from supplemental use in surgery and trauma patients to the primary medication in oxygen therapy. This is the most effective treatment for any respiratory illness. Despite the importance of oxygen for public health and its demand as a life-saving drug, research on the subject is limited, with the majority of studies conducted following the outbreak of the COVID-19 pandemic. Due to the lack of empirical studies, we aimed to compile the recent research efforts with the current state of the field through a systematic review. Methods: We have performed a systematic review targeting the medical oxygen ecosystem, following the Preferred Reporting Items for Systematic review and Meta-Analysis Protocols (PRISMA-P). For the study, we have limited our scope to healthcare facilities and domiciliary applications of medical oxygen. We considered the articles published in the last twenty years, starting from the SARS outbreak in November 2002 to 15^th May 2022. Results: Our systematic search resulted in forty-one preliminary articles, with three more articles appended for a complete outlook on the topic. Based on the selected articles, the current state of the topic was presented through detailed discussion and analysis. Conclusion: We have presented an in-depth discussion of the research works found through the systematic search while extrapolating to provide insights on the current subject scenario. We have highlighted the areas with inadequate contemporary studies and presented some research gaps in the field.

  🖺 Full Text HTML: A Systematic Review on Medical Oxygen Ecosystem: Current State and Recent Advancements
• Host and viral determinants of airborne transmission of SARS-CoV-2 in the Syrian hamster -
  It remains poorly understood how SARS-CoV-2 infection influences the physiological host factors important for aerosol transmission. We assessed breathing pattern, exhaled droplets, and infectious virus after infection with Alpha and Delta variants of concern (VOC) in the Syrian hamster. Both VOCs displayed a confined window of detectable airborne virus (24h - 48h), shorter than compared to oropharyngeal swabs. The loss of airborne shedding was linked to airway constriction resulting in a decrease of fine aerosols produced. Male sex was associated with increased viral replication and virus shedding in the air, including a VOC-independent particle-profile shift towards smaller droplets. Transmission efficiency varied among donors, including a superspreading event. Co-infection with VOCs only occurred when both viruses were shed by the same donor during an increased exposure timeframe. This highlights that assessment of host and virus factors resulting in a differential exhaled particle profile is critical for understanding airborne transmission.
  🖺 Full Text HTML: Host and viral determinants of airborne transmission of SARS-CoV-2 in the Syrian hamster

From Clinical Trials

• MG Granules Improve COVID-19 Efficacy and Safety of Convalescent Exercise Tolerance - Condition:   COVID-19
  Intervention:   Drug: Manzi Guben granules
  Sponsors:   Second Affiliated Hospital, School of Medicine, Zhejiang University;   The First Affiliated Hospital of Zhejiang Chinese Medical University;   Hangzhou Hospital of Traditional Chinese Medicine;   Suzhou Hospital of Traditional Chinese Medicine
  Not yet recruiting

• Effects of Pilates in Patients With Post- -COVID-19 Syndrome: Controlled and Randomized Clinical Trial - Condition:   COVID-19
  Intervention:   Procedure: Pilates Exercises
  Sponsor:   Michele de Aguiar Zacaria
  Recruiting

• Heterologous Booster Study of COVID-19 Protein Subunit Recombinant Vaccine in Children 12-17 Years of Age - Condition:   COVID-19
  Intervention:   Biological: SARS-CoV-2 subunit protein recombinant vaccine
  Sponsors:   PT Bio Farma;   Faculty of Medicine Universitas Padjadjaran
  Not yet recruiting

• ACTIV-6: COVID-19 Study of Repurposed Medications - Arm C (Fluticasone) - Condition:   Covid19
  Interventions:   Drug: Fluticasone;   Other: Placebo
  Sponsors:   Susanna Naggie, MD;   National Center for Advancing Translational Sciences (NCATS);   Vanderbilt University Medical Center
  Completed

• ACTIV-6: COVID-19 Study of Repurposed Medications - Arm A (Ivmermectin 400) - Condition:   Covid19
  Interventions:   Drug: Ivermectin;   Other: Placebo
  Sponsors:   Susanna Naggie, MD;   National Center for Advancing Translational Sciences (NCATS);   Vanderbilt University Medical Center
  Completed

• Improving Adherence to COVID-19 Prevention Behaviours: Test of Persuasive Messages - Condition:   COVID-19
  Intervention:   Behavioral: Persuasive Appeal
  Sponsor:   University of Calgary
  Completed

• Counter-Regulatory Hormonal and Stress Systems in Patients With COVID-19 - Condition:   COVID-19
  Intervention:   Diagnostic Test: Blood sampling
  Sponsor:   Fondazione Policlinico Universitario Agostino Gemelli IRCCS
  Completed

• Exploratory Efficacy of N-Acetylcysteine in Patients With History of COVID-19 - Condition:   COVID-19
  Interventions:   Drug: N-Acetylcysteine;   Drug: Placebo
  Sponsor:   Fondazione Policlinico Universitario Agostino Gemelli IRCCS
  Active, not recruiting

• Incidence of COVID-19 Following Vaccination in Botswana Against SARS CoV 2 - Condition:   COVID-19
  Intervention:   Drug: AZD 1222
  Sponsors:   Botswana Harvard AIDS Institute Partnership;   AstraZeneca;   Botswana Ministry of Health
  Completed

• Study Evaluating GS-5245 in Nonhospitalized Participants With COVID-19 - Condition:   COVID-19
  Interventions:   Drug: GS-5245;   Drug: GS-5245 Placebo
  Sponsor:   Gilead Sciences
  Not yet recruiting

• Study for Efficacy and Safety Assessment of the Drug RADAMIN®VIRO for COVID-19 Postexposure Prophylaxis - Condition:   COVID-19
  Interventions:   Drug: Double-Stranded RNA sodium salt;   Drug: Placebo
  Sponsor:   Promomed, LLC
  Completed

• Study to Access the Efficacy and Safety of STI-1558 in Adult Subjects With Mild or Moderate (COVID-19) - Condition:   COVID-19
  Interventions:   Drug: STI-1558;   Drug: STI-1558 placebo
  Sponsor:   Zhejiang ACEA Pharmaceutical Co. Ltd.
  Not yet recruiting

• Efficacy and Safety of Umbilical Cord Mesenchymal Stem Cells in the Treatment of Long COVID-19 - Condition:   Long COVID-19
  Intervention:   Biological: UC-MSCs
  Sponsor:   Shanghai East Hospital
  Not yet recruiting

• CONFIDENCE: a Multicomponent Clinic-based Intervention to Promote COVID-19 Vaccine Intention and Uptake Among Diverse Youth and Adolescents - Condition:   COVID-19 Vaccination
  Intervention:   Behavioral: CONFIDENCE
  Sponsors:   University of Massachusetts, Worcester;   Merck Sharp & Dohme LLC;   Baystate Health
  Not yet recruiting

• Cognitive Rehabilitation for People With Cognitive Covid19 - Condition:   Long Covid19
  Intervention:   Behavioral: Cognitive rehabilitation
  Sponsors:   University College, London;   Bangor University;   St George’s University Hospitals NHS Foundation Trust;   University of Brighton;   University Hospital Southampton NHS Foundation Trust;   Greater Manchester Mental Health NHS Foundation Trust
  Recruiting

From PubMed

From Patent Search