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Coronavir.org

Site de veille et d'information sur le nouveau coronavirus SARS-COV-2 et la maladie associée COVID-19

Actualités et recherches en cours

SARS-CoV-2 transmission occurs even among fully vaccinated individuals; thus, prompt identification of infected patients is central to control viral circulation. Antigen rapid diagnostic tests (Ag-RDT) are highly specific, but sensitivity is variable.Discordant RT-qPCR vs Ag-RDT results are reported, raising the question of whether negative Ag-RDT in positive RT-qPCR samples could imply the absence of infectious viruses. To study the relationshi...

Third doses of mRNA COVID-19 vaccines induced a significant increase in neutralizing potency and breadth in naive individuals comparable with convalescents who restored levels after the first two doses. These results suggest a limit to elicit neutralization in the number of stimuli by infection or vaccination with ancestral SARS-CoV-2 sequences ...

Between February 2019 and March 2021, 388 dried blood spot samples were obtained from 257 children <30 months of age who were part of a longitudinal maternal/infant cohort in Haiti. Among the children followed, 16.7% became seropositive; sampling date was the only covariate associated with the hazard of seroconversion. ...

While the combination of casirivimab-imdevimab (Ronapreve Roche Regeneron) has been shown to confer satisfactory protection against the delta variant kidney transplant recipients (KTRs) with COVID-19, it has limited neutralizing activity against the current variants of concern (Omicron BA.1, BA.1.1 and BA.2). In contrast, cilgavimab-tixagevimab combination (Evusheld, Astra Zeneca) retains a partial neutralizing activity against omicron in vitro....

Point-of-care (POC) nucleic acid detection technologies are poised to aid gold-standard technologies in controlling the COVID-19 pandemic, yet shortcomings in the capability to perform critically needed complex detection--such as multiplexed detection for viral variant surveillance--may limit their widespread adoption. Herein, we developed a robust multiplexed CRISPR-based detection using LwaCas13a and PsmCas13b to simultaneously diagnose SARS-C...

BackgroundReal-time polymerase chain reaction (RT-PCR) testing on a nasopharyngeal swab is the current standard for SARS-CoV-2 virus detection. Since collection of this sample type is experienced uncomfortable by patients, saliva- and oropharyngeal swab collections should be considered as alternative specimens. ObjectivesEvaluation of the relative performance of oropharyngeal swab, nasopharyngeal swab and saliva for the RT-PCR based SARS-CoV-2 ...

It has been suggested that COVID-19 patients have distinct tongue features, which may help to monitor the development of their condition. To determine if there was any specific tongue coating feature in COVID-19, this study investigated the difference in tongue coating between COVID-19 subjects and subjects with other acute inflammatory diseases characterized by fever. Tongue images taken with smartphones from three age-matched groups, namely, C...

Alaska is the largest geographic state in the United States with the lowest population density and a mix of urban centers and isolated rural communities. The differences in population dynamics in Alaska from the contiguous United States may have contributed to a unique pattern of emergence and spread of SARS-CoV-2 variants observed in early 2021. Here we examined 2,323 virus genomes from Alaska and 278,635 virus genomes from the contiguous Unite...

BackgroundAcute COVID-19 clinical symptoms have been clearly documented, but long-term functional and symptomatic recovery from COVID -19 is less well described. MethodsA systematic review and meta-analysis were conducted to describe patient-reported outcome measures (PROMs) in adults at least 8 weeks post hospital discharge for COVID-19. Comprehensive database searches in accordance with the PRISMA statement were carried out up till 31/05/2021...

The recent surge of SARS-CoV-2 Omicron variant (B.1.1.529) coincided with new treatment options for mild-to-moderate Covid-19 in high-risk adolescents and adults. In this report we describe patient characteristics, treatment-related process measures and outcomes associated with early Covid-19 therapy in high-risk pediatric patients. ...

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