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1.
Cell ; 176(6): 1420-1431.e17, 2019 03 07.
Artigo em Inglês | MEDLINE | ID: mdl-30849373

RESUMO

Respiratory syncytial virus (RSV) is a worldwide public health concern for which no vaccine is available. Elucidation of the prefusion structure of the RSV F glycoprotein and its identification as the main target of neutralizing antibodies have provided new opportunities for development of an effective vaccine. Here, we describe the structure-based design of a self-assembling protein nanoparticle presenting a prefusion-stabilized variant of the F glycoprotein trimer (DS-Cav1) in a repetitive array on the nanoparticle exterior. The two-component nature of the nanoparticle scaffold enabled the production of highly ordered, monodisperse immunogens that display DS-Cav1 at controllable density. In mice and nonhuman primates, the full-valency nanoparticle immunogen displaying 20 DS-Cav1 trimers induced neutralizing antibody responses ∼10-fold higher than trimeric DS-Cav1. These results motivate continued development of this promising nanoparticle RSV vaccine candidate and establish computationally designed two-component nanoparticles as a robust and customizable platform for structure-based vaccine design.


Assuntos
Anticorpos Neutralizantes/imunologia , Vírus Sinciciais Respiratórios/imunologia , Vacinação/métodos , Animais , Anticorpos Neutralizantes/metabolismo , Anticorpos Antivirais/imunologia , Caveolina 1 , Linhagem Celular , Células HEK293 , Humanos , Camundongos , Camundongos Endogâmicos BALB C , Nanopartículas/uso terapêutico , Cultura Primária de Células , Vírus Sinciciais Respiratórios/patogenicidade , Vacinas/imunologia , Proteínas Virais de Fusão/imunologia , Proteínas Virais de Fusão/metabolismo , Proteínas Virais de Fusão/fisiologia
2.
Immunity ; 54(4): 769-780.e6, 2021 04 13.
Artigo em Inglês | MEDLINE | ID: mdl-33823129

RESUMO

An effective vaccine for respiratory syncytial virus (RSV) is an unrealized public health goal. A single dose of the prefusion-stabilized fusion (F) glycoprotein subunit vaccine (DS-Cav1) substantially increases serum-neutralizing activity in healthy adults. We sought to determine whether DS-Cav1 vaccination induces a repertoire mirroring the pre-existing diversity from natural infection or whether antibody lineages targeting specific epitopes predominate. We evaluated RSV F-specific B cell responses before and after vaccination in six participants using complementary B cell sequencing methodologies and identified 555 clonal lineages. DS-Cav1-induced lineages recognized the prefusion conformation of F (pre-F) and were genetically diverse. Expressed antibodies recognized all six antigenic sites on the pre-F trimer. We identified 34 public clonotypes, and structural analysis of two antibodies from a predominant clonotype revealed a common mode of recognition. Thus, vaccination with DS-Cav1 generates a diverse polyclonal response targeting the antigenic sites on pre-F, supporting the development and advanced testing of pre-F-based vaccines against RSV.


Assuntos
Anticorpos Antivirais/imunologia , Formação de Anticorpos/imunologia , Infecções por Vírus Respiratório Sincicial/imunologia , Vacinas contra Vírus Sincicial Respiratório/imunologia , Vírus Sincicial Respiratório Humano/imunologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Anticorpos Neutralizantes/imunologia , Linhagem Celular , Linhagem Celular Tumoral , Criança , Pré-Escolar , Estudos de Coortes , Epitopos/imunologia , Feminino , Células HEK293 , Humanos , Lactente , Recém-Nascido , Masculino , Pessoa de Meia-Idade , Vacinação/métodos , Proteínas Virais de Fusão/imunologia , Adulto Jovem
3.
Physiol Rev ; 100(4): 1527-1594, 2020 10 01.
Artigo em Inglês | MEDLINE | ID: mdl-32216549

RESUMO

Respiratory syncytial virus (RSV) is one of the leading causes of viral respiratory tract infection in infants, the elderly, and the immunocompromised worldwide, causing more deaths each year than influenza. Years of research into RSV since its discovery over 60 yr ago have elucidated detailed mechanisms of the host-pathogen interface. RSV infection elicits widespread transcriptomic and proteomic changes, which both mediate the host innate and adaptive immune responses to infection, and reflect RSV's ability to circumvent the host stress responses, including stress granule formation, endoplasmic reticulum stress, oxidative stress, and programmed cell death. The combination of these events can severely impact on human lungs, resulting in airway remodeling and pathophysiology. The RSV membrane envelope glycoproteins (fusion F and attachment G), matrix (M) and nonstructural (NS) 1 and 2 proteins play key roles in modulating host cell functions to promote the infectious cycle. This review presents a comprehensive overview of how RSV impacts the host response to infection and how detailed knowledge of the mechanisms thereof can inform the development of new approaches to develop RSV vaccines and therapeutics.


Assuntos
Antivirais/farmacologia , Infecções por Vírus Respiratório Sincicial/prevenção & controle , Infecções por Vírus Respiratório Sincicial/virologia , Vírus Sincicial Respiratório Humano , Vacinas Virais/imunologia , Humanos , Infecções por Vírus Respiratório Sincicial/tratamento farmacológico , Infecções por Vírus Respiratório Sincicial/imunologia
4.
Immunity ; 46(2): 301-314, 2017 02 21.
Artigo em Inglês | MEDLINE | ID: mdl-28228284

RESUMO

Respiratory syncytial virus (RSV) is the major cause of lower respiratory tract infections in infants and is characterized by pulmonary infiltration of B cells in fatal cases. We analyzed the B cell compartment in human newborns and identified a population of neonatal regulatory B lymphocytes (nBreg cells) that produced interleukin 10 (IL-10) in response to RSV infection. The polyreactive B cell receptor of nBreg cells interacted with RSV protein F and induced upregulation of chemokine receptor CX3CR1. CX3CR1 interacted with RSV glycoprotein G, leading to nBreg cell infection and IL-10 production that dampened T helper 1 (Th1) cytokine production. In the respiratory tract of neonates with severe RSV-induced acute bronchiolitis, RSV-infected nBreg cell frequencies correlated with increased viral load and decreased blood memory Th1 cell frequencies. Thus, the frequency of nBreg cells is predictive of the severity of acute bronchiolitis disease and nBreg cell activity may constitute an early-life host response that favors microbial pathogenesis.


Assuntos
Linfócitos B Reguladores/imunologia , Bronquiolite Viral/imunologia , Receptores de Quimiocinas/imunologia , Infecções por Vírus Respiratório Sincicial/imunologia , Linfócitos B Reguladores/virologia , Bronquiolite Viral/patologia , Linfócitos T CD4-Positivos/imunologia , Receptor 1 de Quimiocina CX3C , Ensaio de Imunoadsorção Enzimática , ELISPOT , Perfilação da Expressão Gênica , Humanos , Recém-Nascido , Ativação Linfocitária/imunologia , Análise de Sequência com Séries de Oligonucleotídeos , Infecções por Vírus Respiratório Sincicial/patologia , Vírus Sinciciais Respiratórios , Transcriptoma
5.
J Biol Chem ; : 107514, 2024 Jun 28.
Artigo em Inglês | MEDLINE | ID: mdl-38945449

RESUMO

The development of safe and effective broad-spectrum antivirals that target the replication machinery of respiratory viruses is of high priority in pandemic preparedness programs. Here, we studied the mechanism of action of a newly discovered nucleotide analog against diverse RNA-dependent RNA polymerases (RdRp) of prototypic respiratory viruses. GS-646939 is the active 5'-triphosphate (TP) metabolite of a 4'-cyano modified C-adenosine analog phosphoramidate prodrug GS-7682. Enzyme kinetics show that the RdRps of human rhinovirus type 16 (HRV-16) and enterovirus 71 (EV-71) incorporate GS-646939 with unprecedented selectivity; GS-646939 is incorporated 20-50-fold more efficiently than its natural ATP counterpart. The RdRp complex of respiratory syncytial virus (RSV) and human metapneumovirus (HMPV) incorporate GS-646939 and ATP with similar efficiency. In contrast, influenza B RdRp shows a clear preference for ATP and human mitochondrial RNA polymerase (h-mtRNAP) does not show significant incorporation of GS-646939. Once incorporated into the nascent RNA strand, GS-646939 acts as a chain-terminator although higher NTP concentrations can partially overcome inhibition for some polymerases. Modeling and biochemical data suggest that the 4'-modification inhibits RdRp translocation. Comparative studies with GS-443902, the active triphosphate form of the 1'-cyano modified prodrugs remdesivir and obeldesivir, reveal not only different mechanisms of inhibition, but also differences in the spectrum of inhibition of viral polymerases. In conclusion, 1'-cyano and 4'-cyano modifications of nucleotide analogs provide complementary strategies to target the polymerase of several families of respiratory RNA viruses.

6.
Hum Genomics ; 18(1): 48, 2024 May 20.
Artigo em Inglês | MEDLINE | ID: mdl-38769549

RESUMO

BACKGROUND: After the occurrence of the COVID-19 pandemic, detection of other disseminated respiratory viruses using highly sensitive molecular methods was declared essential for monitoring the spread of health-threatening viruses in communities. The development of multiplex molecular assays are essential for the simultaneous detection of such viruses even at low concentrations. In the present study, a highly sensitive and specific multiplex one-step droplet digital PCR (RT-ddPCR) assay was developed for the simultaneous detection and absolute quantification of influenza A (IAV), influenza B (IBV), respiratory syncytial virus (RSV), and beta-2-microglobulin transcript as an endogenous internal control (IC B2M). RESULTS: The assay was first evaluated for analytical sensitivity and specificity, linearity, reproducibility, and recovery rates with excellent performance characteristics and then applied to 37 wastewater samples previously evaluated with commercially available and in-house quantitative real-time reverse transcription PCR (RT-qPCR) assays. IAV was detected in 16/37 (43%), IBV in 19/37 (51%), and RSV in 10/37 (27%) of the wastewater samples. Direct comparison of the developed assay with real-time RT-qPCR assays showed statistically significant high agreement in the detection of IAV (kappa Cohen's correlation coefficient: 0.834, p = 0.001) and RSV (kappa: 0.773, p = 0.001) viruses between the two assays, while the results for the detection of IBV (kappa: 0.355, p = 0.27) showed good agreement without statistical significance. CONCLUSIONS: Overall, the developed one-step multiplex ddPCR assay is cost-effective, highly sensitive and specific, and can simultaneously detect three common respiratory viruses in the complex matrix of wastewater samples even at low concentrations. Due to its high sensitivity and resistance to PCR inhibitors, the developed assay could be further used as an early warning system for wastewater monitoring.


Assuntos
Vírus da Influenza A , Vírus da Influenza B , Reação em Cadeia da Polimerase Multiplex , Águas Residuárias , Águas Residuárias/virologia , Vírus da Influenza A/genética , Vírus da Influenza A/isolamento & purificação , Humanos , Vírus da Influenza B/genética , Vírus da Influenza B/isolamento & purificação , Reação em Cadeia da Polimerase Multiplex/métodos , Sensibilidade e Especificidade , Vírus Sinciciais Respiratórios/genética , Vírus Sinciciais Respiratórios/isolamento & purificação , Reprodutibilidade dos Testes , Influenza Humana/diagnóstico , Influenza Humana/virologia , Influenza Humana/genética , Vírus Sincicial Respiratório Humano/genética , Vírus Sincicial Respiratório Humano/isolamento & purificação , Reação em Cadeia da Polimerase em Tempo Real/métodos , SARS-CoV-2/genética , SARS-CoV-2/isolamento & purificação
7.
Mol Ther ; 32(4): 1033-1047, 2024 Apr 03.
Artigo em Inglês | MEDLINE | ID: mdl-38341613

RESUMO

As the world continues to confront severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), respiratory syncytial virus (RSV) is also causing severe respiratory illness in millions of infants, elderly individuals, and immunocompromised people globally. Exacerbating the situation is the fact that co-infection with multiple viruses is occurring, something which has greatly increased the clinical severity of the infections. Thus, our team developed a bivalent vaccine that delivered mRNAs encoding SARS-CoV-2 Omicron spike (S) and RSV fusion (F) proteins simultaneously, SF-LNP, which induced S and F protein-specific binding antibodies and cellular immune responses in BALB/c mice. Moreover, SF-LNP immunization effectively protected BALB/c mice from RSV infection and hamsters from SARS-CoV-2 Omicron infection. Notably, our study pointed out the antigenic competition problem of bivalent vaccines and provided a solution. Overall, our results demonstrated the potential of preventing two infectious diseases with a single vaccine and provided a paradigm for the subsequent design of multivalent vaccines.


Assuntos
COVID-19 , Infecções por Vírus Respiratório Sincicial , Vacinas contra Vírus Sincicial Respiratório , Vírus Sincicial Respiratório Humano , Humanos , Camundongos , Lactente , Cricetinae , Animais , Idoso , Vacinas de mRNA , Vacinas Combinadas , Anticorpos Antivirais , Vacinas contra Vírus Sincicial Respiratório/genética , Proteínas Virais de Fusão/genética , COVID-19/prevenção & controle , SARS-CoV-2/genética , Vírus Sincicial Respiratório Humano/genética , Infecções por Vírus Respiratório Sincicial/prevenção & controle , Anticorpos Neutralizantes
8.
Cell Mol Life Sci ; 81(1): 267, 2024 Jun 17.
Artigo em Inglês | MEDLINE | ID: mdl-38884678

RESUMO

Neutralizing antibodies are considered a correlate of protection against severe human respiratory syncytial virus (HRSV) disease. Currently, HRSV neutralization assays are performed on immortalized cell lines like Vero or A549 cells. It is known that assays on these cell lines exclusively detect neutralizing antibodies (nAbs) directed to the fusion (F) protein. For the detection of nAbs directed to the glycoprotein (G), ciliated epithelial cells expressing the cellular receptor CX3CR1 are required, but generation of primary cell cultures is expensive and labor-intensive. Here, we developed a high-throughput neutralization assay based on the interaction between clinically relevant HRSV grown on primary cells with ciliated epithelial cells, and validated this assay using a panel of infant sera. To develop the high-throughput neutralization assay, we established a culture of differentiated apical-out airway organoids (Ap-O AO). CX3CR1 expression was confirmed, and both F- and G-specific monoclonal antibodies neutralized HRSV in the Ap-O AO. In a side-by-side neutralization assay on Vero cells and Ap-O AO, neutralizing antibody levels in sera from 125 infants correlated well, although titers on Ap-O AO were consistently lower. We speculate that these lower titers might be an actual reflection of the neutralizing antibody capacity in vivo. The organoid-based neutralization assay described here holds promise for further characterization of correlates of protection against HRSV disease.


Assuntos
Anticorpos Neutralizantes , Receptor 1 de Quimiocina CX3C , Testes de Neutralização , Organoides , Infecções por Vírus Respiratório Sincicial , Vírus Sincicial Respiratório Humano , Humanos , Vírus Sincicial Respiratório Humano/imunologia , Anticorpos Neutralizantes/imunologia , Organoides/metabolismo , Organoides/imunologia , Organoides/virologia , Organoides/citologia , Animais , Testes de Neutralização/métodos , Chlorocebus aethiops , Células Vero , Infecções por Vírus Respiratório Sincicial/imunologia , Infecções por Vírus Respiratório Sincicial/virologia , Receptor 1 de Quimiocina CX3C/metabolismo , Receptor 1 de Quimiocina CX3C/imunologia , Anticorpos Antivirais/imunologia , Proteínas Virais de Fusão/imunologia , Proteínas Virais de Fusão/metabolismo , Lactente , Células Epiteliais/metabolismo , Células Epiteliais/imunologia , Células Epiteliais/virologia , Anticorpos Monoclonais/imunologia
9.
Cell Mol Life Sci ; 81(1): 94, 2024 Feb 18.
Artigo em Inglês | MEDLINE | ID: mdl-38368584

RESUMO

The complement system, a key component of innate immunity, provides the first line of defense against bacterial infection; however, the COVID-19 pandemic has revealed that it may also engender severe complications in the context of viral respiratory disease. Here, we review the mechanisms of complement activation and regulation and explore their roles in both protecting against infection and exacerbating disease. We discuss emerging evidence related to complement-targeted therapeutics in COVID-19 and compare the role of the complement in other respiratory viral diseases like influenza and respiratory syncytial virus. We review recent mechanistic studies and animal models that can be used for further investigation. Novel knockout studies are proposed to better understand the nuances of the activation of the complement system in respiratory viral diseases.


Assuntos
COVID-19 , Influenza Humana , Vírus Sincicial Respiratório Humano , Animais , Humanos , Pandemias , Proteínas do Sistema Complemento
10.
Artigo em Inglês | MEDLINE | ID: mdl-38502541

RESUMO

RATIONALE: Respiratory syncytial virus (RSV) is a common global respiratory virus increasingly recognized as a major pathogen in frail older adults and as a cause of chronic obstructive pulmonary disease (COPD) exacerbations. There is no single test for RSV in adults with acceptable diagnostic accuracy. Trials of RSV vaccines have recently shown excellent safety and efficacy against RSV in older adults; defining the frequency of RSV-related community infections and COPD exacerbations is important for vaccine deployment decisions. OBJECTIVES: This prospective study aimed to establish the frequency of outpatient-managed RSV-related exacerbations of COPD in two well-characterized patient cohorts using a combination of diagnostic methods. METHODS: Participants were recruited at specialist clinics in London, UK and Groningen, NL from 2017 and observed for three consecutive RSV seasons, during exacerbations and at least twice yearly. RSV infections were detected by reverse transcription-polymerase chain reaction (RT-PCR) and serologic testing. MEASUREMENTS AND MAIN RESULTS: 377 patients with COPD attended 1,999 clinic visits and reported 310 exacerbations. There were 27 RSV-related exacerbations (8·7% of total); of these, seven were detected only on PCR, 16 only on serology and 4 by both methods. Increases in RSV specific N-protein antibody were as sensitive as antibody to pre-F or post-F for serodiagnosis of RSV related exacerbations. CONCLUSIONS: RSV is associated with 8.7% of outpatient managed COPD exacerbations in this study. Antibodies to RSV-N protein may have diagnostic value, potentially important in a vaccinated population. The introduction of vaccines that prevent RSV is expected to benefit patients with COPD. This article is open access and distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).

11.
Proc Natl Acad Sci U S A ; 119(12): e2112410119, 2022 03 22.
Artigo em Inglês | MEDLINE | ID: mdl-35286196

RESUMO

SignificanceStrategies to reduce consumption of antimicrobial drugs are needed to contain the growing burden of antimicrobial resistance. Respiratory syncytial virus (RSV) is a prominent cause of upper and lower respiratory tract infections, as a single agent and in conjunction with bacterial pathogens, and may thus contribute to the burden of both inappropriately treated viral infections and appropriately treated polymicrobial infections involving bacteria. In a double-blind, randomized, placebo-controlled trial, administering an RSV vaccine to pregnant mothers reduced antimicrobial prescribing among their infants by 12.9% over the first 3 mo of life. Our findings implicate RSV as an important contributor to antimicrobial exposure among infants and demonstrate that this exposure is preventable by use of effective maternal vaccines against RSV.


Assuntos
Anti-Infecciosos , Infecções por Vírus Respiratório Sincicial , Vacinas contra Vírus Sincicial Respiratório , Vírus Sincicial Respiratório Humano , Antibacterianos , Feminino , Humanos , Lactente , Gravidez , Infecções por Vírus Respiratório Sincicial/tratamento farmacológico , Infecções por Vírus Respiratório Sincicial/prevenção & controle , Vacinas contra Vírus Sincicial Respiratório/uso terapêutico , Vacinação
12.
J Infect Dis ; 229(Supplement_1): S70-S77, 2024 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-37970679

RESUMO

BACKGROUND: Individuals with comorbidities are at increased risk of severe respiratory syncytial virus (RSV) infection. We estimated RSV-associated respiratory hospitalization among adults aged ≥45 years with comorbidities in Denmark and Scotland. METHODS: By analyzing national hospital and virologic data, we estimated annual RSV-associated hospitalizations by 7 selected comorbidities and ages between 2010 and 2018. We estimated rate ratios of RSV-associated hospitalization for adults with comorbidity than the overall population. RESULTS: In Denmark, annual RSV-associated hospitalization rates per 1000 adults ranged from 3.1 for asthma to 19.4 for chronic kidney disease (CKD). In Scotland, rates ranged from 2.4 for chronic liver disease to 9.0 for chronic obstructive pulmonary disease (COPD). In both countries, we found a 2- to 4-fold increased risk of RSV hospitalization for adults with COPD, ischemic heart disease, stroke, and diabetes; a 1.5- to 3-fold increased risk for asthma; and a 3- to 7-fold increased risk for CKD. RSV hospitalization rates among adults aged 45 to 64 years with COPD, asthma, ischemic heart disease, or CKD were higher than the overall population. CONCLUSIONS: This study provides important evidence for identifying risk groups and assisting health authorities in RSV vaccination policy making.


Assuntos
Asma , Isquemia Miocárdica , Doença Pulmonar Obstrutiva Crônica , Insuficiência Renal Crônica , Infecções por Vírus Respiratório Sincicial , Vírus Sincicial Respiratório Humano , Adulto , Humanos , Comorbidade , Asma/complicações , Asma/epidemiologia , Doença Pulmonar Obstrutiva Crônica/complicações , Doença Pulmonar Obstrutiva Crônica/epidemiologia , Hospitalização , Infecções por Vírus Respiratório Sincicial/epidemiologia , Insuficiência Renal Crônica/epidemiologia
13.
J Infect Dis ; 229(Supplement_1): S51-S60, 2024 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-37824420

RESUMO

BACKGROUND: With the licensure of maternal respiratory syncytial virus (RSV) vaccines in Europe and the United States, data are needed to better characterize the burden of RSV-associated acute respiratory infections (ARI) in pregnancy. The current study aimed to determine among pregnant individuals the proportion of ARI testing positive for RSV and the RSV incidence rate, RSV-associated hospitalizations, deaths, and perinatal outcomes. METHODS: We conducted a systematic review, following PRISMA 2020 guidelines, using 5 databases (Medline, Embase, Global Health, Web of Science, and Global Index Medicus), and including additional unpublished data. Pregnant individuals with ARI who had respiratory samples tested for RSV were included. We used a random-effects meta-analysis to generate overall proportions and rate estimates across studies. RESULTS: Eleven studies with pregnant individuals recruited between 2010 and 2022 were identified, most of which recruited pregnant individuals in community, inpatient and outpatient settings. Among 8126 pregnant individuals, the proportion with ARI that tested positive for RSV ranged from 0.9% to 10.7%, with a meta-estimate of 3.4% (95% confidence interval [CI], 1.9%-54%). The pooled incidence rate of RSV among pregnant individuals was 26.0 (95% CI, 15.8-36.2) per 1000 person-years. RSV hospitalization rates reported in 2 studies were 2.4 and 3.0 per 1000 person-years. In 5 studies that ascertained RSV-associated deaths among 4708 pregnant individuals, no deaths were reported. Three studies comparing RSV-positive and RSV-negative pregnant individuals found no difference in the odds of miscarriage, stillbirth, low birth weight, and small size for gestational age. RSV-positive pregnant individuals had higher odds of preterm delivery (odds ratio, 3.6 [95% CI, 1.3-10.3]). CONCLUSIONS: Data on RSV-associated hospitalization rates are limited, but available estimates are lower than those reported in older adults and young children. As countries debate whether to include RSV vaccines in maternal vaccination programs, which are primarily intended to protect infants, this information could be useful in shaping vaccine policy decisions.


Assuntos
Complicações Infecciosas na Gravidez , Infecções por Vírus Respiratório Sincicial , Infecções Respiratórias , Feminino , Humanos , Gravidez , Bases de Dados Factuais , Europa (Continente) , Vírus Sincicial Respiratório Humano , Infecções Respiratórias/epidemiologia , Infecções Respiratórias/virologia , Infecções por Vírus Respiratório Sincicial/epidemiologia , Complicações Infecciosas na Gravidez/epidemiologia , Complicações Infecciosas na Gravidez/virologia
14.
J Infect Dis ; 229(Supplement_1): S25-S33, 2024 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-37249267

RESUMO

BACKGROUND: Previous studies reported inconsistent findings regarding the association between respiratory syncytial virus (RSV) subgroup distribution and timing of RSV season. We aimed to further understand the association by conducting a global-level systematic analysis. METHODS: We compiled published data on RSV seasonality through a systematic literature review, and unpublished data shared by international collaborators. Using annual cumulative proportion (ACP) of RSV-positive cases, we defined RSV season onset and offset as ACP reaching 10% and 90%, respectively. Linear regression models accounting for meteorological factors were constructed to analyze the association of proportion of RSV-A with the corresponding RSV season onset and offset. RESULTS: We included 36 study sites from 20 countries, providing data for 179 study-years in 1995-2019. Globally, RSV subgroup distribution was not significantly associated with RSV season onset or offset globally, except for RSV season offset in the tropics in 1 model, possibly by chance. Models that included RSV subgroup distribution and meteorological factors explained only 2%-4% of the variations in timing of RSV season. CONCLUSIONS: Year-on-year variations in RSV season onset and offset are not well explained by RSV subgroup distribution or meteorological factors. Factors including population susceptibility, mobility, and viral interference should be examined in future studies.


Assuntos
Vírus Sincicial Respiratório Humano , Humanos , Modelos Lineares , Estações do Ano , Interferência Viral
15.
J Infect Dis ; 229(Supplement_1): S84-S91, 2024 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-37930815

RESUMO

Several immunization products are currently being developed against respiratory syncytial virus (RSV) for children, pregnant females, and older adults, and some products have already received authorization. Therefore, studies to monitor the effectiveness of these products are needed in the following years. To assist researchers to conduct postmarketing studies, we developed a generic protocol for register-based cohort studies to evaluate immunization product effectiveness against RSV-specific and nonspecific outcomes. To conduct a study on the basis of this generic protocol, the researchers can use any relevant databases or healthcare registers that are available at the study site.


Assuntos
Vírus Sincicial Respiratório Humano , Vacinas , Criança , Feminino , Gravidez , Humanos , Idoso , Anticorpos Monoclonais/uso terapêutico , Estudos de Coortes , Vacinação , Medicamentos Genéricos
16.
J Infect Dis ; 229(Supplement_1): S61-S69, 2024 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-37797317

RESUMO

BACKGROUND: Socioeconomic deprivation may predispose individuals to respiratory tract infections. We estimated RSV-associated hospitalizations by socioeconomic deprivation in Scotland. METHODS: Using national routine health care records and virological surveillance from 2010 to 2016, we used a time-series linear regression model and a direct measurement based on ICD-10 coded diagnoses to estimate RSV-associated hospitalizations by Scottish Index of Multiple Deprivation (SIMD) quintile and age in comparison to influenza-associated hospitalizations. RESULTS: We estimated an annual average rate per 1000 people of 0.76 (95% CI: 0.43-0.90) in the least deprived group to 1.51 (1.03-1.79) for the most deprived group using model-based approach. The rate ratio (RR) was 1.96 (1.23-3.25), 1.60 (1.0-2.66), 1.35 (0.85-2.25), and 1.12 (0.7-1.85) in the 1st to 4th quintile versus the least deprived group. The pattern of RSV-associated hospitalization rates variation with SIMD was most pronounced in children 0-2y. The ICD-10 approach provided much lower rates than the model-based approach but yielded similar RR estimates between SIMD. Influenza-associated hospitalization rate generally increased with higher deprivation levels among individuals 1y+. CONCLUSIONS: Higher RSV and influenza hospitalization rates are related to higher deprivation levels. Differences between deprivation levels are most pronounced in infants and young children for RSV, and are more apparent among individuals 1y+ for influenza.


Assuntos
Influenza Humana , Vírus Sincicial Respiratório Humano , Adulto , Criança , Lactente , Humanos , Pré-Escolar , Influenza Humana/epidemiologia , Escócia/epidemiologia , Hospitalização , Hospitais
17.
J Infect Dis ; 229(Supplement_1): S34-S39, 2024 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-37578049

RESUMO

Respiratory syncytial virus (RSV) is a common pathogen causing mostly cold-like symptoms, but in very young infants and elderly individuals it can lead to severe disease and even death. There are currently promising developments both in vaccine development and in therapeutics that are expected to be approved soon. To get an impression within European countries of the laboratory diagnostics and surveillance activities, in anticipation of these developments, we queried the members of the European Respiratory Syncytial Virus Laboratory Network (RSV-LabNet, under the umbrella of the PROMISE project) via an online survey. The answers from the consortium members showed scattered monitoring and the application of a broad array of techniques in the laboratories. A majority of the members expressed strong interest in harmonization and collaboration for setting up surveillance programs and the need for sharing laboratory protocols. The additional value of RSV whole-genome sequencing is broadly appreciated, but implementation requires further development and closer collaboration. The RSV-LabNet can have an important responsibility in establishing contacts and exchange of expertise and providing a platform for communication to advance diagnostics, preparedness, and surveillance.


Assuntos
Laboratórios , Vírus Sincicial Respiratório Humano , Idoso , Lactente , Humanos , Vírus Sincicial Respiratório Humano/genética , Europa (Continente)/epidemiologia , Sequenciamento Completo do Genoma
18.
J Infect Dis ; 229(Supplement_1): S78-S83, 2024 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-37747825

RESUMO

BACKGROUND: Low awareness and lack of routine testing for respiratory syncytial virus (RSV) infections among adults has led to underreporting in hospital records. This study aimed to assess the underreporting and misclassification of RSV infections among adults hospitalized with an respiratory tract infection (RTI)-coded hospitalization. METHODS: This study is an observational cohort study of RSV-associated hospitalizations among Danish adults (≥18 years old) conducted, between 2015 to 2018. Data were extracted from the Danish National Patient Registry (DNPR) and the Danish Microbiology Database. We identified RSV-positive hospitalizations by linking RTI-coded hospitalizations with a positive RSV test. RESULTS: Using hospital admission registries, we identified 440 RSV-coded hospitalizations, of whom 420 (95%) had a positive RSV test registered. By linking patients with RTI-coded hospital admissions to RSV test result, we found 570 additional episodes of RSV-positive hospitalizations without an RSV-coded diagnosis. CONCLUSIONS: Our study of national register data showed that RSV is underreported among Danish adults. The study showed that the reliability of hospitalization data to estimate the burden of RSV among adults is questionable and are sensitive to changes in practice over time, even with complete nationwide healthcare data. Healthcare data can be useful to observe seasonality but to estimate the disease burden, prospective surveillance is recommended.


Assuntos
Infecções por Vírus Respiratório Sincicial , Vírus Sincicial Respiratório Humano , Infecções Respiratórias , Adulto , Humanos , Adolescente , Estudos Prospectivos , Reprodutibilidade dos Testes , Infecções por Vírus Respiratório Sincicial/diagnóstico , Infecções por Vírus Respiratório Sincicial/epidemiologia , Infecções Respiratórias/epidemiologia , Hospitalização , Dinamarca/epidemiologia
19.
J Infect Dis ; 2024 Apr 12.
Artigo em Inglês | MEDLINE | ID: mdl-38606958

RESUMO

BACKGROUND: Respiratory syncytial virus (RSV) causes substantial respiratory disease. Bivalent RSV prefusion F (RSVpreF) vaccine is licensed in ≥60-year-olds. RSVpreF was well-tolerated and immunogenic in a phase 1/2 study. We evaluated antibody persistence after initial vaccination and safety and immunogenicity after revaccination from this study. METHODS: Healthy adults were randomized to receive both initial vaccination and revaccination 12 months later with either placebo or RSVpreF 240 µg (±Al(OH)3). RSV-A and RSV-B geometric mean neutralizing titers (GMTs) were measured through 12 months after both vaccinations. Tolerability/safety was assessed. RESULTS: There were 263 participants revaccinated (18-49-years-old, n=134; 65-85-years-old, n=129). Among 18-49-year-olds and 65-85-year-olds, respectively, geometric mean fold rises (GMFRs) for both RSV subgroups (RSV-A; RSV-B) 1 month after initial RSVpreF vaccination were 13.3-20.4 and 8.9-15.5 compared with levels before initial vaccination; corresponding GMFRs 12 months after initial vaccination were 4.1-5.0 and 2.6-4.1. GMFRs 1 month after revaccination compared with levels before revaccination were 1.4-2.3 and 1.4-2.2 for 18-49-year-olds and 65-85-year-olds, respectively. Peak GMTs after revaccination were lower than those after initial vaccination. GMTs 12 months after initial vaccination and revaccination were similar, with GMFRs ranging from 0.7-1.6. No safety signals occurred. CONCLUSIONS: RSVpreF revaccination was immunogenic and well-tolerated among adults. NCT03529773.

20.
J Infect Dis ; 2024 Apr 18.
Artigo em Inglês | MEDLINE | ID: mdl-38636496

RESUMO

Respiratory syncytial virus (RSV) causes severe infections in infants, immunocompromised or elderly individuals resulting in annual epidemics of respiratory disease. Currently, limited clinical surveillance and the lack of predictable seasonal dynamics limits the public health response. Wastewater-based epidemiology (WBE) has recently been used globally as a key metric in determining prevalence of SARS-CoV-2 in the community but its application to other respiratory viruses is limited. In this study, we present an integrated genomic WBE approach, applying RT-qPCR and partial G-gene sequencing to track RSV levels and variants in the community. We report increasing detection of RSV in wastewater concomitant with increasing numbers of positive clinical cases. Analysis of wastewater-derived RSV sequences permitted identification of distinct circulating lineages within and between seasons. Altogether, our genomic WBE platform has the potential to complement ongoing global surveillance and aid the management of RSV by informing the timely deployment of pharmaceutical and non-pharmaceutical interventions.

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