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1.
J Med Virol ; 94(1): 186-196, 2022 01.
Artigo em Inglês | MEDLINE | ID: mdl-34427932

RESUMO

In classical viral infections, the avidity of immunoglobulin G (IgG) is low during acute infection and high a few months later. As recently reported, SARS-CoV-2 infections are not following this scheme, but they are rather characterized by incomplete avidity maturation. This study was performed to clarify whether infection with seasonal coronaviruses also leads to incomplete avidity maturation. The avidity of IgG toward the nucleoprotein (NP) of the seasonal coronaviruses 229E, NL63, OC43, HKU1 and of SARS-CoV-2 was determined in the sera from 88 healthy, SARS-CoV-2-negative subjects and in the sera from 70 COVID-19 outpatients, using the recomLine SARS-CoV-2 assay with recombinant antigens. In the sera from SARS-CoV-2-negative subjects, incomplete avidity maturation (persistent low and intermediate avidity indices) was the lowest for infections with the alpha-coronaviruses 229E (33.3%) and NL63 (61.3%), and the highest for the beta-coronaviruses OC43 (77.5%) and HKU1 (71.4%). In the sera from COVID-19 patients, the degree of incomplete avidity maturation of IgG toward NP of 223E, OC43, and HKU1 was not significantly different from that found in SARS-CoV-2-negative subjects, but a significant increase in avidity was observed for IgG toward NP of NL63. Though there was no cross-reaction between SARS-CoV-2 and seasonal coronaviruses, higher concentrations of IgG directed toward seasonal coronaviruses seemed to indirectly increase avidity maturation of IgG directed toward SARS-CoV-2. Our data show that incomplete IgG avidity maturation represents a characteristic consequence of coronavirus infections. This raises problems for the serological differentiation between acute and past infections and may be important for the biology of coronaviruses.


Assuntos
Alphacoronavirus/imunologia , Afinidade de Anticorpos , Betacoronavirus/imunologia , COVID-19/imunologia , Infecções por Coronavirus/imunologia , Imunoglobulina G/imunologia , SARS-CoV-2/imunologia , Adolescente , Adulto , Idoso , Anticorpos Antivirais/sangue , Anticorpos Antivirais/imunologia , Coronavirus Humano NL63/imunologia , Proteínas do Nucleocapsídeo de Coronavírus/imunologia , Coronavirus Humano OC43/imunologia , Reações Cruzadas , Feminino , Humanos , Imunoglobulina G/sangue , Masculino , Pessoa de Meia-Idade , Fosfoproteínas/imunologia , Estações do Ano , Adulto Jovem
2.
Sci Rep ; 11(1): 24145, 2021 12 17.
Artigo em Inglês | MEDLINE | ID: mdl-34921180

RESUMO

Recent studies suggest that coronaviruses circulate widely in Southeast Asian bat species and that the progenitors of the SARS-Cov-2 virus could have originated in rhinolophid bats in the region. Our objective was to assess the diversity and circulation patterns of coronavirus in several bat species in Southeast Asia. We undertook monthly live-capture sessions and sampling in Cambodia over 17 months to cover all phases of the annual reproduction cycle of bats and test specifically the association between their age and CoV infection status. We additionally examined current information on the reproductive phenology of Rhinolophus and other bat species presently known to occur in mainland southeast China, Vietnam, Laos and Cambodia. Results from our longitudinal monitoring (573 bats belonging to 8 species) showed an overall proportion of positive PCR tests for CoV of 4.2% (24/573) in cave-dwelling bats from Kampot and 4.75% (22/463) in flying-foxes from Kandal. Phylogenetic analysis showed that the PCR amplicon sequences of CoVs (n = 46) obtained clustered in Alphacoronavirus and Betacoronavirus. Interestingly, Hipposideros larvatus sensu lato harbored viruses from both genera. Our results suggest an association between positive detections of coronaviruses and juvenile and immature bats in Cambodia (OR = 3.24 [1.46-7.76], p = 0.005). Since the limited data presently available from literature review indicates that reproduction is largely synchronized among rhinolophid and hipposiderid bats in our study region, particularly in its more seasonal portions (above 16° N), this may lead to seasonal patterns in CoV circulation. Overall, our study suggests that surveillance of CoV in insectivorous bat species in Southeast Asia, including SARS-CoV-related coronaviruses in rhinolophid bats, could be targeted from June to October for species exhibiting high proportions of juveniles and immatures during these months. It also highlights the need to develop long-term longitudinal surveys of bats and improve our understanding of their ecology in the region, for both biodiversity conservation and public health reasons.


Assuntos
Alphacoronavirus/genética , Betacoronavirus/genética , COVID-19/transmissão , Quirópteros/crescimento & desenvolvimento , SARS-CoV-2/genética , Alphacoronavirus/classificação , Animais , Ásia Sudeste/epidemiologia , Betacoronavirus/classificação , COVID-19/epidemiologia , COVID-19/virologia , Camboja/epidemiologia , Quirópteros/classificação , Quirópteros/virologia , Epidemias/prevenção & controle , Evolução Molecular , Genoma Viral/genética , Geografia , Humanos , Estudos Longitudinais , Masculino , Filogenia , SARS-CoV-2/classificação , SARS-CoV-2/fisiologia , Especificidade da Espécie
3.
Recurso na Internet em Português | LIS - Localizador de Informação em Saúde | ID: lis-48531

RESUMO

Página com as principais dúvidas sobre o coronavírus, tais como: o que é coronavírus?; como o Coronavírus é transmitido?; quais são os sintomas?; como é o tratamento?; quando se deve procurar o serviço de saúde?; quando devo usar a máscara de proteção?.


Assuntos
Infecções por Coronavirus/epidemiologia , Pneumonia Viral/epidemiologia , Brasil/epidemiologia , Betacoronavirus
4.
Recurso na Internet em Português | LIS - Localizador de Informação em Saúde | ID: lis-48529

RESUMO

Boletins Coronavírus de óbitos e casos confirmados no RJ


Assuntos
Infecções por Coronavirus/epidemiologia , Pneumonia Viral/epidemiologia , Brasil/epidemiologia , Betacoronavirus
5.
Recurso na Internet em Inglês, Espanhol, Francês, Português | LIS - Localizador de Informação em Saúde | ID: lis-48473

RESUMO

Embora a cobertura vacinal contra a COVID-19 tenha alcançado 41% na América Latina e no Caribe, a vigilância continuará a ser fundamental para identificar novos riscos e responder aos focos locais da doença, afirmou a diretora da Organização Pan-Americana da Saúde (OPAS), Carissa F. Etienne.


Assuntos
América/epidemiologia , COVID-19 , Vigilância em Saúde Pública , Betacoronavirus
6.
J Nat Prod ; 84(11): 3001-3007, 2021 11 26.
Artigo em Inglês | MEDLINE | ID: mdl-34677966

RESUMO

The pressing need for SARS-CoV-2 controls has led to a reassessment of strategies to identify and develop natural product inhibitors of zoonotic, highly virulent, and rapidly emerging viruses. This review article addresses how contemporary approaches involving computational chemistry, natural product (NP) and protein databases, and mass spectrometry (MS) derived target-ligand interaction analysis can be utilized to expedite the interrogation of NP structures while minimizing the time and expense of extraction, purification, and screening in BioSafety Laboratories (BSL)3 laboratories. The unparalleled structural diversity and complexity of NPs is an extraordinary resource for the discovery and development of broad-spectrum inhibitors of viral genera, including Betacoronavirus, which contains MERS, SARS, SARS-CoV-2, and the common cold. There are two key technological advances that have created unique opportunities for the identification of NP prototypes with greater efficiency: (1) the application of structural databases for NPs and target proteins and (2) the application of modern MS techniques to assess protein-ligand interactions directly from NP extracts. These approaches, developed over years, now allow for the identification and isolation of unique antiviral ligands without the immediate need for BSL3 facilities. Overall, the goal is to improve the success rate of NP-based screening by focusing resources on source materials with a higher likelihood of success, while simultaneously providing opportunities for the discovery of novel ligands to selectively target proteins involved in viral infection.


Assuntos
Antivirais/farmacologia , Betacoronavirus/efeitos dos fármacos , Produtos Biológicos/farmacologia , Descoberta de Drogas , Biologia Computacional , Bases de Dados de Compostos Químicos , Bases de Dados de Proteínas , Ligantes , Espectrometria de Massas , Mapeamento de Interação de Proteínas , SARS-CoV-2/efeitos dos fármacos
7.
Viruses ; 13(10)2021 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-34696405

RESUMO

Coronaviruses (CoVs) are widespread and highly diversified in wildlife and domestic mammals and can emerge as zoonotic or epizootic pathogens and consequently host shift from these reservoirs, highlighting the importance of veterinary surveillance. All genera can be found in mammals, with α and ß showing the highest frequency and diversification. The aims of this study were to review the literature for features of CoV surveillance in animals, to test widely used molecular protocols, and to identify the most effective one in terms of spectrum and sensitivity. We combined a literature review with analyses in silico and in vitro using viral strains and archive field samples. We found that most protocols defined as pan-coronavirus are strongly biased towards α- and ß-CoVs and show medium-low sensitivity. The best results were observed using our new protocol, showing LoD 100 PFU/mL for SARS-CoV-2, 50 TCID50/mL for CaCoV, 0.39 TCID50/mL for BoCoV, and 9 ± 1 log2 ×10-5 HA for IBV. The protocol successfully confirmed the positivity for a broad range of CoVs in 30/30 field samples. Our study points out that pan-CoV surveillance in mammals could be strongly improved in sensitivity and spectrum and propose the application of a new RT-PCR assay, which is able to detect CoVs from all four genera, with an optimal sensitivity for α-, ß-, and γ-.


Assuntos
Alphacoronavirus/genética , Infecções por Coronavirus/veterinária , Deltacoronavirus/genética , Gammacoronavirus/genética , SARS-CoV-2/genética , Animais , Animais Selvagens/virologia , Betacoronavirus/genética , COVID-19/veterinária , Quirópteros/virologia , Genoma Viral/genética , Humanos , Gado/virologia , Roedores/virologia
8.
Viruses ; 13(10)2021 10 06.
Artigo em Inglês | MEDLINE | ID: mdl-34696436

RESUMO

According to various estimates, only a small percentage of existing viruses have been discovered, naturally much less being represented in the genomic databases. High-throughput sequencing technologies develop rapidly, empowering large-scale screening of various biological samples for the presence of pathogen-associated nucleotide sequences, but many organisms are yet to be attributed specific loci for identification. This problem particularly impedes viral screening, due to vast heterogeneity in viral genomes. In this paper, we present a new bioinformatic pipeline, VirIdAl, for detecting and identifying viral pathogens in sequencing data. We also demonstrate the utility of the new software by applying it to viral screening of the feces of bats collected in the Moscow region, which revealed a significant variety of viruses associated with bats, insects, plants, and protozoa. The presence of alpha and beta coronavirus reads, including the MERS-like bat virus, deserves a special mention, as it once again indicates that bats are indeed reservoirs for many viral pathogens. In addition, it was shown that alignment-based methods were unable to identify the taxon for a large proportion of reads, and we additionally applied other approaches, showing that they can further reveal the presence of viral agents in sequencing data. However, the incompleteness of viral databases remains a significant problem in the studies of viral diversity, and therefore necessitates the use of combined approaches, including those based on machine learning methods.


Assuntos
Alphacoronavirus/isolamento & purificação , Betacoronavirus/isolamento & purificação , Quirópteros/virologia , Genoma Viral/genética , Metagenoma/genética , Alphacoronavirus/classificação , Alphacoronavirus/genética , Animais , Betacoronavirus/classificação , Betacoronavirus/genética , Quirópteros/genética , Biologia Computacional/métodos , Fezes/virologia , Sequenciamento de Nucleotídeos em Larga Escala , Metagenômica/métodos , Moscou , Phycodnaviridae/classificação , Phycodnaviridae/genética , Phycodnaviridae/isolamento & purificação , Análise de Sequência de DNA
9.
Immunity ; 54(10): 2385-2398.e10, 2021 10 12.
Artigo em Inglês | MEDLINE | ID: mdl-34508662

RESUMO

Potent neutralizing SARS-CoV-2 antibodies often target the spike protein receptor-binding site (RBS), but the variability of RBS epitopes hampers broad neutralization of multiple sarbecoviruses and drifted viruses. Here, using humanized mice, we identified an RBS antibody with a germline VH gene that potently neutralized SARS-related coronaviruses, including SARS-CoV and SARS-CoV-2 variants. X-ray crystallography revealed coordinated recognition by the heavy chain of non-RBS conserved sites and the light chain of RBS with a binding angle mimicking the angiotensin-converting enzyme 2 (ACE2) receptor. The minimum footprints in the hypervariable region of RBS contributed to the breadth of neutralization, which was enhanced by immunoglobulin G3 (IgG3) class switching. The coordinated binding resulted in broad neutralization of SARS-CoV and emerging SARS-CoV-2 variants of concern. Low-dose therapeutic antibody treatment in hamsters reduced the virus titers and morbidity during SARS-CoV-2 challenge. The structural basis for broad neutralizing activity may inform the design of a broad spectrum of therapeutics and vaccines.


Assuntos
Anticorpos Amplamente Neutralizantes/imunologia , Reações Cruzadas/imunologia , SARS-CoV-2/imunologia , Animais , Betacoronavirus/imunologia , Sítios de Ligação de Anticorpos , Anticorpos Amplamente Neutralizantes/química , Anticorpos Amplamente Neutralizantes/uso terapêutico , COVID-19/prevenção & controle , COVID-19/terapia , COVID-19/virologia , Cricetinae , Humanos , Switching de Imunoglobulina , Fragmentos Fab das Imunoglobulinas/química , Fragmentos Fab das Imunoglobulinas/metabolismo , Imunoglobulina G/química , Imunoglobulina G/imunologia , Camundongos , Domínios Proteicos , Glicoproteína da Espícula de Coronavírus/química , Glicoproteína da Espícula de Coronavírus/imunologia , Glicoproteína da Espícula de Coronavírus/metabolismo
11.
mBio ; 12(5): e0237121, 2021 10 26.
Artigo em Inglês | MEDLINE | ID: mdl-34579570

RESUMO

In 2019, a new pandemic virus belonging to the betacoronavirus family emerged, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). This new coronavirus appeared in Wuhan, China, and is responsible for severe respiratory pneumonia in humans, namely, coronavirus disease 2019 (COVID-19). Having infected almost 200 million people worldwide and caused more than 4.1 million deaths as of today, this new disease has raised a significant number of questions about its molecular mechanism of replication and, in particular, how infectious viral particles are produced. Although viral entry is well characterized, the full assembly steps of SARS-CoV-2 have still not been fully described. Coronaviruses, including SARS-CoV-2, have four main structural proteins, namely, the spike glycoprotein (S), the membrane glycoprotein (M), the envelope protein (E), and the nucleocapsid protein (N). All these proteins have key roles in the process of coronavirus assembly and budding. In this review, we gathered the current knowledge about betacoronavirus structural proteins involved in viral particle assembly, membrane curvature and scission, and then egress in order to suggest and question a coherent model for SARS-CoV-2 particle production and release.


Assuntos
Betacoronavirus/metabolismo , SARS-CoV-2/metabolismo , Glicoproteínas de Membrana/metabolismo , Proteínas do Nucleocapsídeo/metabolismo , Glicoproteína da Espícula de Coronavírus/metabolismo , Montagem de Vírus/fisiologia
13.
Sci Rep ; 11(1): 18847, 2021 09 22.
Artigo em Inglês | MEDLINE | ID: mdl-34552110

RESUMO

As the SARS-CoV-2 has spread and the pandemic has dragged on, the virus continued to evolve rapidly resulting in the emergence of new highly transmissible variants that can be of public health concern. The evolutionary mechanisms that drove this rapid diversity are not well understood but neutral evolution should open the first insight. The neutral theory of evolution states that most mutations in the nucleic acid sequences are random and they can be fixed or disappear by purifying selection. Herein, we performed a neutrality test to better understand the selective pressures exerted over SARS-CoV-2 spike protein from homologue proteins of Betacoronavirus, as well as to the spikes from human clinical isolates of the virus. Specifically, Tyr and Asn have higher occurrence rates on the Receptor Binding Domain (RBD) and in the overall sequence of spike proteins of Betacoronavirus, whereas His and Arg have lower occurrence rates. The in vivo evolutionary phenomenon of SARS-CoV-2 shows that Glu, Lys, Phe, and Val have the highest probability of occurrence in the emergent viral particles. Amino acids that have higher occurrence than the expected by the neutral control, are favorable and are fixed in the sequence while the ones that have lower occurrence than expected, influence the stability and/or functionality of the protein. Our results show that most unique mutations either for SARS-CoV-2 or its variants of health concern are under selective pressures, which could be related either to the evasion of the immune system, increasing the virus' fitness or altering protein - protein interactions with host proteins. We explored the consequences of those selected mutations in the structure and protein - protein interaction with the receptor. Altogether all these forces have shaped the spike protein and the continually evolving variants.


Assuntos
Enzima de Conversão de Angiotensina 2/metabolismo , SARS-CoV-2/genética , Glicoproteína da Espícula de Coronavírus/genética , Glicoproteína da Espícula de Coronavírus/metabolismo , Aminoácidos/química , Aminoácidos/genética , Enzima de Conversão de Angiotensina 2/química , Betacoronavirus/genética , Evolução Molecular , Deriva Genética , Glicosilação , Humanos , Modelos Teóricos , Mutação , Ligação Proteica/genética , Glicoproteína da Espícula de Coronavírus/química
14.
Int. j. med. surg. sci. (Print) ; 8(3): 1-15, sept. 2021. tab
Artigo em Espanhol | LILACS | ID: biblio-1292440

RESUMO

En la COVID-19 un porcentaje de los enfermos desarrolla cuadros severos, con una elevada mortalidad, siendo necesario el estudio de sus características con el objetivo de frenar la progresión de la enfermedad. Se realizó un estudio retrospectivo en una cohorte de 150 pacientes adultos atendidos en el hospital Manuel Fajardo de Villa Clara, Cuba, en el período de marzo a junio de 2020. Se analizaron variables demográficas, clínicas, de laboratorio, gasométricas y radiológicas medidas al ingreso hospitalario; definiéndose dos grupos de pacientes según la evolución clínica: severos y no severos. Para la comparación de los grupos se realizó un análisis bivariado con el objetivo de determinar aquellas variables con asociación significativa a la severidad. Del total de pacientes, 26 (17,3%) evolucionaron a la severidad y 124 (83.7%), evolucionó satisfactoriamente. Los pacientes severos se caracterizaron por tener edad avanzada (media: 83 años) y presentar comorbilidades; siendo las más significativas: hipertensión arterial, diabetes mellitus, cardiopatía, enfermedad renal crónica y cáncer (p<0.0001). La polipnea y diarrea fueron las manifestaciones clínicas con mayor asociación a la severidad (p<0.0001), seguido por la fiebre (p=0.0157). La escala pronóstica quick SOFA mostró ser un instrumento útil para evaluar a los pacientes al ingreso. Las variables de laboratorio: neutrófilos, linfocitos, índice neutrófilos/linfocitos, hemoglobina. y lactato deshidrogenasa fueron las que mayor asociación tuvieron con la severidad (p<0.0001). Los leucocitos, lactato, dímero D, proteína C reactiva, glicemia y calcio también mostraron resultados significativos (p< 0.05). De las variables gasométricas, la presión y saturación arterial de oxígeno fueron las más significativamente asociadas a la severidad; así como la presencia de infiltrados o consolidación pulmonar en la radiografía de tórax (p <0.0001). El estudio permitió identificar variables al ingreso hospitalario, asociadas a progresión hacia formas severas de la enfermedad


In COVID-19, a percentage of patients develop severe disease, with high mortality, since has been necessary to study its characteristics to stop the progression of the disease. A retrospective study was carried out in a cohort of 150 adult patients attended at Manuel Fajardo Hospital in Villa Clara, Cuba, from March to June 2020. Demographic, clinical, laboratory, gasometric and radiological variables measured at hospital admission were analyzed, defining two groups of patients according to clinical evolution: severe and non-severe. For the comparison of the groups a bivariate analysis was performed, with the objective of determining those variables with a significant association to severity. Of the total number of patients, 26 (17.3%) evolved to severity and 124 (83.7%) evolved satisfactorily. Severe patients were characterized by advanced age (mean: 83 years) and comorbidities; the most significant being hypertension, diabetes mellitus, heart disease, chronic kidney disease and cancer (p< 0.0001). Polypnea and diarrhea were the clinical manifestations with the highest association with severity (p<0.0001), followed by fever (p=0.0157). The quick SOFA prognostic scale proved to be a useful instrument to evaluate patients at admission. Laboratory variables: neutrophils, lymphocytes, neutrophil/lymphocyte ratio, hemoglobin and lactate dehydrogenase were the most associated with severity (p<0.0001). Leukocytes, lactate, D-dimer, C-reactive protein, glycemia and calcium also showed significant results (p<0.05). Of the gasometric variables, arterial oxygen pressure and saturation were the most significantly associated with severity; as well as the presence of pulmonary infiltrates or consolidation in the chest X-ray (p<0.0001). The study allowed us to identify variables at hospital admission associated with progression to severe forms of the disease.


Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Idoso , Idoso de 80 Anos ou mais , Índice de Gravidade de Doença , Infecções por Coronavirus , COVID-19 , Pneumonia Viral , Estudos Retrospectivos , Diabetes Mellitus , Betacoronavirus , Hipertensão
15.
Int. j. med. surg. sci. (Print) ; 8(3): 1-18, sept. 2021. tab, ilus
Artigo em Espanhol | LILACS | ID: biblio-1292534

RESUMO

mundo se encuentra en medio de la pandemia de la enfermedad por coronavirus 2019 (COVID-19). En la mayoría de los países, la tasa de mortalidad, así como, la severidad de la enfermedad es más alta en hombres que en mujeres. Este sesgo sexual sugiere que los hombres son más propensos a desarrollar complicaciones graves o a sucumbir a las mismas, lo que conduce a la muerte. Por lo tanto, es importante comprender los elementos biológicos basados en el sexo que inciden en la respuesta inmunitaria. El objetivo de ésta revisión fue hacer un análisis en relación a la evidencia disponible sobre los diferentes factores que permitirían explicar esta disparidad sexual. Abordamos las diferencias en la respuesta inmunitaria en ambos sexos tomando en cuenta el aspecto genético, hormonal y el papel del sistema renina-angiotensina. Para ello, se realizó una búsqueda minuciosa en diferentes bases de datos utilizando las siguientes palabras clave: (Diferencia de sexo, genética, hormonas sexuales, COVID-19, SARS-CoV-2, respuesta inmunitaria, inflamación, hombres, mujeres). Los resultados de nuestro análisis ofrecen una comprensión más clara sobre la influencia de las diferencias sexuales en la capacidad de respuesta a una infección, con especial énfasis en la infección por SARS-CoV-2. Conocer estos factores no solo ayudará a comprender mejor la patogenia de la COVID-19, sino, además, guiará el diseño de terapias efectivas para la medicina personalizada basada en las diferencias sexuales


The world is during the 2019 coronavirus disease pandemic (COVID-19). In most countries, the mortality rate, as well as, the severity of the disease is higher in men than in women. This sex bias suggests that men are more likely to develop severe complications or succumb to severe complications, leading to death. Therefore, it is important to understand the sex-based biological elements that influence the immune response. The aim of this review was to review the available evidence on the different factors that could explain this sex disparity. We addressed the differences in the immune response in both sexes taking into account genetic, hormonal and the role of the renin-angiotensin system. For this purpose, a thorough search was performed in different databases using the following keywords: (Sex difference, genetics, sex hormones, COVID-19, SARS-CoV-2, immune response, inflammation, men, women). The results of our analysis provide a clearer understanding on the influence of sex differences on the ability to respond to an infection, with special emphasis to SARS-CoV-2 infection. Knowing these factors will not only help to better understand the pathogenesis of COVID-19, but will also guide the design of effective therapies for personalized medicine based on sex differences.


Assuntos
Humanos , Infecções por Coronavirus , COVID-19/complicações , Pneumonia Viral , Cromossomo X , Índice de Gravidade de Doença , Distribuição por Sexo , Betacoronavirus
16.
Front Immunol ; 12: 696370, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34386006

RESUMO

The COVID-19 pandemic is caused by SARS-CoV-2, a novel zoonotic coronavirus. Emerging evidence indicates that preexisting humoral immunity against other seasonal human coronaviruses (HCoVs) plays a critical role in the specific antibody response to SARS-CoV-2. However, current work to assess the effects of preexisting and cross-reactive anti-HCoVs antibodies has been limited. To address this issue, we have adapted our previously reported multiplex assay to simultaneously and quantitatively measure anti-HCoV antibodies. The full mPlex-CoV panel covers the spike (S) and nucleocapsid (N) proteins of three highly pathogenic HCoVs (SARS-CoV-1, SARS-CoV-2, MERS) and four human seasonal strains (OC43, HKU1, NL63, 229E). Combining this assay with volumetric absorptive microsampling (VAMS), we measured the anti-HCoV IgG, IgA, and IgM antibodies in fingerstick blood samples. The results demonstrate that the mPlex-CoV assay has high specificity and sensitivity. It can detect strain-specific anti-HCoV antibodies down to 0.1 ng/ml with 4 log assay range and with low intra- and inter-assay coefficients of variation (%CV). We also estimate multiple strain HCoVs IgG, IgA and IgM concentration in VAMS samples in three categories of subjects: pre-COVID-19 (n=21), post-COVID-19 convalescents (n=19), and COVID-19 vaccine recipients (n=14). Using metric multidimensional scaling (MDS) analysis, HCoVs IgG concentrations in fingerstick blood samples were well separated between the pre-COVID-19, post-COVID-19 convalescents, and COVID-19 vaccine recipients. In addition, we demonstrate how multi-dimensional scaling analysis can be used to visualize IgG mediated antibody immunity against multiple human coronaviruses. We conclude that the combination of VAMS and the mPlex-Cov assay is well suited to performing remote study sample collection under pandemic conditions to monitor HCoVs antibody responses in population studies.


Assuntos
Anticorpos Antivirais/sangue , Coronavirus/imunologia , Reações Cruzadas/imunologia , Imunoensaio/métodos , Anticorpos Antivirais/imunologia , Betacoronavirus/imunologia , COVID-19/imunologia , Coronavirus Humano 229E/imunologia , Coronavirus Humano NL63/imunologia , Proteínas do Nucleocapsídeo de Coronavírus/imunologia , Coronavirus Humano OC43/imunologia , Humanos , Imunoglobulina A/sangue , Imunoglobulina A/imunologia , Imunoglobulina G/sangue , Imunoglobulina G/imunologia , Imunoglobulina M/sangue , Imunoglobulina M/imunologia , Vírus da SARS/imunologia , SARS-CoV-2/imunologia , Glicoproteína da Espícula de Coronavírus/imunologia
18.
Science ; 373(6559): 1109-1116, 2021 09 03.
Artigo em Inglês | MEDLINE | ID: mdl-34344823
19.
Medicine (Baltimore) ; 100(34): e27026, 2021 Aug 27.
Artigo em Inglês | MEDLINE | ID: mdl-34449478

RESUMO

BACKGROUND: There is no definite conclusion about comparison of better effectiveness between N95 respirators and medical masks in preventing health-care workers (HCWs) from respiratory infectious diseases, so that conflicting results and recommendations regarding the protective effects may cause difficulties for selection and compliance of respiratory personal protective equipment use for HCWs, especially facing with pandemics of corona virus disease 2019. METHODS: We systematically searched MEDLINE, Embase, PubMed, China National Knowledge Infrastructure, Wanfang, medRxiv, and Google Scholar from initiation to November 10, 2020 for randomized controlled trials, case-control studies, cohort studies, and cross-sectional studies that reported protective effects of masks or respirators for HCWs against respiratory infectious diseases. We gathered data and pooled differences in protective effects according to different types of masks, pathogens, occupations, concurrent measures, and clinical settings. The study protocol is registered with PROSPERO (registration number: 42020173279). RESULTS: We identified 4165 articles, reviewed the full text of 66 articles selected by abstracts. Six randomized clinical trials and 26 observational studies were included finally. By 2 separate conventional meta-analyses of randomized clinical trials of common respiratory viruses and observational studies of pandemic H1N1, pooled effects show no significant difference between N95 respirators and medical masks against common respiratory viruses for laboratory-confirmed respiratory virus infection (risk ratio 0.99, 95% confidence interval [CI] 0.86-1.13, I2 = 0.0%), clinical respiratory illness (risk ratio 0.89, 95% CI 0.45-1.09, I2 = 83.7%, P = .002), influenza-like illness (risk ratio 0.75, 95% CI 0.54-1.05, I2 = 0.0%), and pandemic H1N1 for laboratory-confirmed respiratory virus infection (odds ratio 0.92, 95% CI 0.49-1.70, I2 = 0.0%, P = .967). But by network meta-analysis, N95 respirators has a significantly stronger protection for HCWs from betacoronaviruses of severe acute respiratory syndrome, middle east respiratory syndrome, and corona virus disease 2019 (odds ratio 0.43, 95% CI 0.20-0.94). CONCLUSIONS: Our results provide moderate and very-low quality evidence of no significant difference between N95 respirators and medical masks for common respiratory viruses and pandemic H1N1, respectively. And we found low quality evidence that N95 respirators had a stronger protective effectiveness for HCWs against betacoronaviruses causative diseases compared to medical masks. The evidence of comparison between N95 respirators and medical masks for corona virus disease 2019 is open to question and needs further study.


Assuntos
Pessoal de Saúde , Máscaras , Respiradores N95 , Infecções Respiratórias/prevenção & controle , Viroses/prevenção & controle , Betacoronavirus , Infecções por Coronavirus/prevenção & controle , Humanos , Controle de Infecções/métodos , Vírus da Influenza A Subtipo H1N1 , Influenza Humana/prevenção & controle , Metanálise em Rede , Infecções Respiratórias/virologia
20.
PLoS One ; 16(8): e0256482, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34449792

RESUMO

BACKGROUND: The effects of pre-existing endemic human coronavirus (HCoV) immunity on SARS-CoV-2 serologic and clinical responses are incompletely understood. OBJECTIVES: We sought to determine the effects of prior exposure to HCoV Betacoronavirus HKU1 spike protein on serologic responses to SARS-CoV-2 spike protein after intramuscular administration in mice. We also sought to understand the baseline seroprevalence of HKU1 spike antibodies in healthy children and to measure their correlation with SARS-CoV-2 binding and neutralizing antibodies in children hospitalized with acute coronavirus disease 2019 (COVID-19) or multisystem inflammatory syndrome (MIS-C). METHODS: Groups of 5 mice were injected intramuscularly with two doses of alum-adjuvanted HKU1 spike followed by SARS-CoV-2 spike; or the reciprocal regimen of SARS-Cov-2 spike followed by HKU1 spike. Sera collected 21 days following each injection was analyzed for IgG antibodies to HKU1 spike, SARS-CoV-2 spike, and SARS-CoV-2 neutralization. Sera from children hospitalized with acute COVID-19, MIS-C or healthy controls (n = 14 per group) were analyzed for these same antibodies. RESULTS: Mice primed with SARS-CoV-2 spike and boosted with HKU1 spike developed high titers of SARS-CoV-2 binding and neutralizing antibodies; however, mice primed with HKU1 spike and boosted with SARS-CoV-2 spike were unable to mount neutralizing antibodies to SARS-CoV-2. HKU1 spike antibodies were detected in all children with acute COVID-19, MIS-C, and healthy controls. Although children with MIS-C had significantly higher HKU1 spike titers than healthy children (GMT 37239 vs. 7551, P = 0.012), these titers correlated positively with both SARS-CoV-2 binding (r = 0.7577, P<0.001) and neutralizing (r = 0.6201, P = 0.001) antibodies. CONCLUSIONS: Prior murine exposure to HKU1 spike protein completely impeded the development of neutralizing antibodies to SARS-CoV-2, consistent with original antigenic sin. In contrast, the presence of HKU1 spike IgG antibodies in children with acute COVID-19 or MIS-C was not associated with diminished neutralizing antibody responses to SARS-CoV-2.


Assuntos
Anticorpos Neutralizantes/imunologia , Betacoronavirus/metabolismo , Glicoproteína da Espícula de Coronavírus/imunologia , Adolescente , Animais , Anticorpos Antivirais/imunologia , Reações Antígeno-Anticorpo , COVID-19/imunologia , COVID-19/patologia , COVID-19/virologia , Criança , Feminino , Humanos , Imunoglobulina G/sangue , Imunoglobulina G/imunologia , Masculino , Camundongos , Camundongos Endogâmicos BALB C , SARS-CoV-2/isolamento & purificação , SARS-CoV-2/metabolismo
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