ETIDIOH - NEW

  ABSTRACT The secondary thrombotic/vascular clinical syndrome of COVID-19 suggests that SARS-CoV-2 infects the endothelium ; however, robust in vitro infection of endothelial cells by various strains of SARS-CoV-2 remains to be demonstrated and continues to be debated. Here, we revisit the question of endothelial cell permissiveness to SARS-CoV-2 using isolated endothelial cells ( from the lung, aorta, and endothelial cell progenitors ), and additionally, to overcome limitations associated with cultured cells , using native endothelial cells within living precision cut human lung slices and single-cell RNA sequencing to track viral presence. Cellular infection in endothelial monocultures was determined using fluorescence imaging. Mediator release was measured by ELISA, and gene expression was assessed by RT-qPCR. Infection in lung slices was determined using single-cell RNA sequencing, capturing molecular identifiers that aligned to the SARS-CoV-2 viral genome (for lung slices). E...

  Summary Background Post-acute sequelae of SARS-CoV-2 infection (PASC) remain a major public health challenge . Although previous studies have focused on characterising PASC in children and adolescents after an initial infection , the risks of PASC after reinfection with the omicron variant remain unclear. We aimed to assess the risk of PASC diagnosis (U09.9) and symptoms and conditions potentially related to PASC in children and adolescents after a SARS-CoV-2 reinfection during the omicron period. Methods This retrospective cohort study used data from 40 children's hospitals and health institutions in the USA participating in the Researching COVID to Enhance Recovery (RECOVER) Initiative. We included patients younger than 21 years at the time of cohort entry; with documented SARS-CoV-2 infection after Jan 1, 2022; and who had at least one health-care visit within 24 months to 7 days before the first infection. The second SARS-CoV-2 infection was confirmed by positive PCR, antigen...

  Summary Post-COVID-19 condition (also known as long COVID) affects a substantial proportion of individuals who have been infected with SARS-CoV-2, profoundly affecting their daily lives and work. Diagnosis and prognosis of long COVID are complex and hindered by heterogeneous symptoms and the absence of validated biomarkers . This systematic review synthesises current evidence on the association between autoantibodies and long COVID, with the goal of evaluating their prognostic and diagnostic utility . Studies published in the PubMed and MEDLINE databases between Jan 1, 2020, and June 10, 2025, were considered. Study selection and quality assessment were done independently by two researchers. Of the 1113 publications screened, 44 studies met the inclusion criteria, with a total of 7571 participants, including 3372 individuals with long COVID. 31 ( 71% ) studies reported an association between autoantibodies and long COVID ; however, there was substantial heterogeneity in study des...

ABSTRACT Many difficult-to-understand clinical features characterize COVID-19 and post-acute sequelae of COVID-19 (PASC or long COVID [LC]). These can include blood pressure instability, hyperinflammation, coagulopathies , and neuropsychiatric complaints . The pathogenesis of these features remains unclear. The SARS-CoV-2 Spike protein receptor-binding domain (RBD) binds angiotensin converting enzyme 2 (ACE2) on the surface of host cells to initiate infection. We hypothesized that some people convalescing from COVID-19 may produce anti-RBD antibodies that resemble ACE2 sufficiently to have ACE2-like catalytic activity , that is, they are ACE2-like proteolytic abzymes that may help mediate the pathogenesis of COVID-19 and LC . In previous work, we showed that some people with acute COVID-19 had immunoglobulin-associated ACE2-like proteolytic activity , suggesting that some people with COVID-19 indeed produced ACE2-like abzymes . However, it remained unknown whether ACE2-like abzymes wer...

Abstract We conducted a multicenter, observational, 12-month follow-up study to identify the extended health burden of severe COVID-19 pneumonia by characterizing long-term sequelae of acute infection in participants previously enrolled in clinical trials for severe COVID-19 pneumonia requiring hospitalization. Overall, 134 (77.5%) of 173 participants completed the study. At 12 months, 51 (29.5%) participants reported cough , 60 (34.7%) reported dyspnea , 56 (32.4%) had residual lung texture abnormalities on high-resolution computed tomography scans, 26 (15.0%) had impaired forced vital capacity , 52 (30.1%) had cognitive impairment , and 77 (44.5%) reported fatigue . Disease severity during acute infection and age were associated with persistent lung abnormalities ; history of hypertension was associated with higher prevalence of fatigue and more frequent dyspnea and cough; and age and obesity were associated with long-term cognitive impairment . Our findings underscore the long-term ...

Summary Background The substantial burden of post-COVID-19 condition (also known as long COVID) underscores the need for effective pharmacological interventions. Given that viral persistence has been hypothesised as a potential cause of long COVID, antiviral therapy might offer a promising approach to alleviating long COVID symptoms. We therefore investigated the efficacy, safety, and tolerability of nirmatrelvir–ritonavir for treating long COVID. Methods In this phase 2, decentralised, double-blind, randomised controlled trial , adults (aged ≥18 years) from the 48 states across the contiguous USA, with previous documented SARS-CoV-2 infection and long COVID symptoms starting within 4 weeks of initial infection and persisting for at least 12 weeks, were eligible for inclusion. Key exclusion criteria were use of nirmatrelvir–ritonavir within the previous 2 months, CYP3A4-dependent medications, or strong CYP3A4 inducers; acute medical illness such as SARS-CoV-2 infection within the past ...

Abstract An exhausted antiviral immune response is observed in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and post-SARS-CoV-2 syndrome , also termed long COVID . In this study, potential mechanisms behind this exhaustion were investigated. First, the viral load of Epstein–Barr virus (EBV), human adenovirus (HAdV), human cytomegalovirus (HCMV), human herpesvirus 6 (HHV6), and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was determined in sputum samples (n = 29) derived from ME/CFS patients (n = 13), healthy controls (n = 10), elderly healthy controls (n = 4), and immunosuppressed controls (n = 2). Secondly, autoantibodies (autoAbs) to type I interferon (IFN-I) in sputum were analyzed to possibly explain impaired viral immunity. We found that ME/CFS patients released EBV at a significantly higher level compared to controls (p = 0.0256). HHV6 was present in ~50% of all participants at the same level. HAdV was detected in two cases with immunosuppression an...

Abstract In a patient on immunosuppressant treatment , SARS-CoV-2 RNA was documented in different extra-respiratory samples over several months in the absence of positive determinations in upper respiratory samples . Whole -genome sequencing of these samples showed the acquisition of different single-nucleotide polymorphisms over time, suggesting viral evolution and thus viral viability. Source: Viruses,  https://www.mdpi.com/1999-4915/17/2/147 _____