Epidemiology and Clinical Presentation of Respiratory Syncytial Virus (RSV) in Newborns: Experience of Neonatology Service CHU Mohammed VI OUJDA during Winter 2024

Respiratory syncytial virus is an important pathogen responsible for lower respiratory tract infections in neonates. This study describes the epidemiological and clinical profile of RSV-positive BAV in 7 newborns who tested positive using PCR-triplex at the neonatology and neonatal intensive care department at Mohammed VI University Hospital-OUJDA (MOROCCO) during the winter of 2024. Among the subjects of our study, there was a female predominance. 29% of cases presented with congenital heart disease, 43% presented with urinary co-infection and 14% died. The average duration of hospitalization was 9 days.

Throat Lozenges and Spray Containing Chlorhexidine and Lidocaine Fixed Combination Show Virucidal Activity against Respiratory Syncytial Virus and SARS-CoV-2

The limitations of existing treatments for both Respiratory Syncytial Virus (RSV) and Severe Acute Respiratory Syndrome-related Coronavirus 2 (SARS-CoV-2) lie in their inability to provide universally accessible, easy-to-use, and effective solutions. A commercially available fixed combination of chlorhexidine and lidocaine in both, lozenge and spray form, were assessed for their antiviral efficacy against RSV and SARS-CoV-2 in a suspension test, the viral titres were measured by standard TCID50. Both formulations were able to reduce the RSV titre to undetectable levels (99.9% virus inactivation, 3 log10 reduction) in less than 1 minute. The lozenge formulation inactivated the viral activity of SARS-CoV-2 in 5 minutes (99% virus inactivation, 2 log10 reduction), while the spray formulation led to a reduction of SARS-CoV-2 titre to undetectable levels in less than 1 minute (99.9%, 3 log10 reduction). In conclusion, our results show that preparations combining chlorhexidine and lidocaine significantly reduce certain respiratory viruses in vitro. In this regard, physiological effects of these preparations become more obvious potentially affecting viral transmission to other individuals and spreading to the lower respiratory tract—thereby shortening the duration and severity of symptoms.

Antiviral Effect of Emodin from Rheum palmatum against Coxsakievirus B_5 and Human Respiratory Syncytial Virus In Vitro

Summary： Viral infections are the major causes of morbidity and mortality in elderly people and young children throughout the world. The most common pathogens include coxsackie virus （CV） and respira- tory syncytial virus （RSV）. However, no antiviral agents with low toxicity and drug resistance are cur- rently available in clinic therapy. The present study aimed to examine the antiviral activities of emodin （an ingredient of Rheum palmatum） against CVB5 and RSV infections, in an attempt to discover new antiviral agents for virus infection. The monomer emodin was extracted and isolated from Rheum pal- matum. The antiviral activities of emodin on HEp-2 cells were evaluated, including virus replication in- hibition, virucidal and anti-absorption effects, by 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyl-2H-tet- razolium bromide （MTT） assay and plaque reduction assay （PRA）. The kinetics of virus inhibition by emodin in a period of 14 h was further determined by plaque assay and quantitative real time PCR （qPCR）. Cytokine （IFN-γ, TNF-α） mRNA expressions after emodin treatment （7.5, 15, 30 μmol/L） were also assessed by qPCR post-infection. The results showed that emodin had potent inhibitory activities against CVB5 and RSV, with the 50% effective concentration （EC50） ranging from 13.06 to 14.27 μmol/L and selectivity index （SI） being 5.38-6.41 μmol/L. However, emodin couldn＇t directly inacti- vate the viruses or block their absorption to cells. It acted as a biological synthesis inhibitor against CVB4 and RSV in a concentration- and time-dependent manner, especially during the first 0-4 h post-infection. Moreover, emodin could decrease the mRNA expression of IFN-α but enhance TNF-γ expression significantly compared to the viral controls in vitro. Our results provide a molecular basis for development of emodin as a novel and safe antiviral agent for human enterovirus and respiratory virus infection in the clinical therapy.

Qingfei oral liquid downregulates TRPV1 expression to reduce airway inflammation and mucus hypersecretion injury caused by respiratory syncytial virus infection and asthma in mice

Objective:Qingfei oral liquid(QF),an experimental Chinese medicine prescription developed from the ancient priscription of traditional Chinese medicines Ma Xin Shi Gan decoction and Tingli Dazao Xie Fei decoction,has been effectively used since decades to treat patients with viral pneumonia and asthma.In our previous study,we had demonstrated that QF can significantly reduce airway hyperresponsiveness,hyperemia,lung tissue edema,inflammatory lung tissue infiltration in mice,airway mucus secretion,and peripheral airway collagen hyperplasia;however,its mechanism of action is unknown.Methods:Fifty 6–8-week-old male BALB/c mice were equally and randomly divided into five groups:the control,ovalbumin(OVA),OVA+respiratory syncytial virus(RSV),QF,and dexamethasone(Dxms)groups.The QF group was administered QF at 1.17 g·kg−1·d−1,the Dxms group received dexamethasone injections at 0.2 mg·kg−1·d−1,and the remaining groups were administered PBS.Inflammation in the lung tissue was assessed by hematoxylin and eosin(HE),periodic acid–Schiff(PAS),and Van Gieson staining.ELISA was used to evaluate the IL-13,IL-25,and IL-33 in the mice.Western blotting was used to examine changes in the proteins levels of transient receptor potential vanilloid-1(TRPV1)and mucin 5AC(MUC5AC)in the lung tissues of mice.Results:Histopathological evaluation revealed that the OVA and OVA+RSV groups exhibited lung tissue edema and inflammatory lung tissue infiltration in the HE staining and airway secretions in the PAS staining;collagen hyperplasia around the airway was increased in these two groups compared with the control group.The QF group exhibited significantly reduced lung tissue edema,inflammatory lung tissue infiltration,airway secretions,and collagen hyperplasia around the airway compared with the OVA+RSV group.We analyzed the serum levels of IL-13,IL-25,and IL-33 in the mice and found that these levels were higher in the OVA and OVA+RSV groups than in the control group(P<0.05 in the OVA group,P<0.01 in the OVA+RSV group).The QF group exhibited significantly decreased serum levels of IL-13,IL-25,and IL-33 compared with the OVA+RSV group(all P<0.05).The Dxms group also exhibited significant decreases in the serum levels of IL-13 and IL-33(all P<0.05)but no significant decrease in the serum levels of IL-25 compared with the RSV+OVA group.Finally,we examined the protein levels of TRPV1 and MUC5AC in the lung tissues of mice using Western blotting.After identifying RSV infection in the mice with asthma,the protein levels of TRPV1 and MUC5AC in the lung tissues of mice were significantly higher than those in the control group(P<0.05,P<0.01).We found that compared with RSV+OVA,QF can significantly downregulate the protein level of TRPV1;further,the protein level of MUC5AC was also significantly reduced(all P<0.001).Conclusion:QF can inhibit RSV replication and reduce airway inflammation and mucus hypersecretion injury caused by RSV infection and asthma,and its mechanism of action may be associated with the downregulation of TRPV1 expression and a decrease in airway mucus hypersecretion injury.

The Association of Respiratory Syncytial Virus Infection and Childhood Asthma: A Meta-Analysis

Objective: To explore the close relationship between respiratory syncytial virus (RSV) infection and acute attack of childhood asthma. Methods: A computer-based search of database from Pumbed, CNKI, Wanfang, Baidu Scholar, Chongqing VIP, GeenMedica was performed to screen the articles about respiratory syncytial virus infection and childhood asthma. Then the literatures were screened out by the selection criteria. The RevMan5.3 software was used to test the heterogeneity and effect values of each study, analyze the sensitivity and publication bias of the literature, and draw on Meta forest plot and Funnel plot. Results: 5 articles conformed to the selection criteria. There were totally 881 cases in the case group, 826 cases in the control group. The results of heterogeneity test showed no heterogeneity between each study (P > 0.05). The fixed-effects model showed the 6.68 (5.06 - 8.82), (Z = 13.38, P < 0.00001). Conclusion: The infection rate of respiratory syncytial virus in children with acute asthma attack is higher than that in remission period. Respiratory syncytial virus infection rate can be used as an indicator of the severity of asthma in children.

Cytokine responses in infants infected with respiratory syncytial virus

Introduction: Variability in severity of Respiratory Syncytial Virus (RSV) infection is reportedly due to differences in inflammatory response. Objective: To characterize the cytokine response in RSV+ infants aged 0 - 36 months and to relate their responses to disease severity. Methods: Nasopharyngeal aspirations (NPAs) were analyzed for RSV and IL-1β, IL-2, IL-4, IL-5, IL-6, IL-10, IL-12, IL-1RA, IL-4R, IFN-γ, sTNFR1, sTNFR2, and TNF-α. Clinical data were collected from the medical records. Results: We included 331 infants of whom 214 were RSV+. In comparison to RSV- infants, they had significantly higher levels of TNF-α, IL-6, IL-1β, and IFN-γ (p α, IL-6, and IL-1β. sTNFR1/2 were significantly increased in RSV+ infants. Hospitalized patients had significantly higher levels of TNF-α, sTNFR2, and IL-10 (p < 0.05) than non-hospitalized patients. The cytokine response could not be related to disease severity. We found no evidence of a skewed Th1/Th2 immune profile. Conclusion: In acute RSV disease, infected infants’ NPAs contain a significant amount of pro-inflammatory cytokines. Whether this response is beneficial or deleterious remains unanswered. Interpersonal variations in cytokine responses might be linked to an inherited tendency to variations in disease severity.

Use of flow cytometry to investigate the cytokine response pattern in infants with respiratory syncytial virus infection and bronchiolitis

Objective: To investigate the cytokine response pattern (IL 4/IFN γ ) in infants with RSV infections and bronchiolitis during the acute phase. Methods: Four color flow cytometry was used to measure intracellular IL 4 and IFN γ expressions in peripheral blood CD3+ and CD8+ lymphocytes from RSV infected and bronchiolitis infants. Serum IL 4 and IFN γ levels were also determined. Results: RSV infected and bronchiolitis infants showed no statistical differences from not RSV infected or pneumonia infants and control in the frequency of IL 4 and IFN γ expressions in CD3+CD8 lymphocytes, showed no obvious Th1/Th2 imbalance, while IFN γ was expressed much more frequently in CD3+CD8+ lymphocytes. Systematically, RSV infected and bronchiolitis infants showed much lower levels of serum IL 4 and IL 4/IFN γ ratios and much higher serum IFN γ levels than control. However, there were no statistical differences in the above three indices between RSV infected and not RSV infected infants or between bronchiolitis and pneumonia infants, except that bronchiolitis infants had a higher level of serum IFN γ than pneumonia infants statistically. Conclusions: There is no type 2 cytokine response predominance in the acute phase of RSV infection and bronchiolitis. IL 4 production is suppressed and IFN γ production upregulated, the latter being most prominent in bronchiolitis infants.

STUDY OF T－LYMPHOCYTE SUBSETS AND INTERLEUKIN－2 AND INTERLEUKIN－2 RECEPTOR OF RESPIRATORY SYNCYTIAL VIRUS PNEUMONIA

T-Lymphocyte subsets and humoral immune and the activity of IL-2 and IL-2R in respiratory syncytial virus (RSV) pneumonia in 26 cases were tested. The result showed in the patients with RSV pneumonia the averages of T3 and T4 were 37.56±1.46% and 27. 15±8. 02% respectively,They were significantly lower than 53.4 ±9.2% and 35.5±7.7% of averages of T3 and T4 in healthy controlled group (both. P< 0. 001 ), the average of T3 was 22. 73±7.06%, it was lower an 26. 7±6. 3 % of T8 in controlled group (P<0. 02 );the ratio of T4/T8 was 1. 245±0. 399 ,there was no significant difference from 1. 35 ±0. 17 of the ratio in controlled group (P > 0. 1). The mean value of IgG was 1. 177± 0. 3685g/L, it was significantly lower than 1. 427± 0. 498g/L of that in controlled group(P < 0. 005). The mean values of IgA and IgM were 0. 1136±0.0393g/L and 0. 768±0. 353g/L respectively, they were significantly lower than 0. 2706 ±0. 876g/L and 0. 122±0. 061g/L of IgA and IgM in controlled group. The activity of IL-2 and IL-2R were 17. 46 ±5. 79%, and 28. 32 ±5. 924% respectively, they were significantly lower than 30. 22 ±14. 55% and 39. 53±8. 61 % of those in healthy group (both P < 0. 001). The severe the pneuumonia, the greater the lowering of IL-2 and IL-2R. These about results suggested that RSV could greatly suppress the immune function of the patients, inducing secondary immunodeficiency, leading to repeated breather and asthma.

Respiratory syncytial virus infection in immunocompetent and immunocompromised murine

The purpose of this study is to distinguish respiratory syncytial virus （RSV） infection and immunology between immunocompetent and immunocompromised murine and to explore immune mechanism of RSV infection. At various time points after RSV infection of BALB/c mice and nude mice, pulmonary viral titers were assayed, RSV antigen was tested by direct immunofluorescent assay and immunohistochemistry. Pulmonary mRNA expressions of Toll like receptor （TLR）2 and TLR4 were assayed by RT-PCR. CD4^＋ ceils and CD8 ^＋ ceils in peripheral blood were examined by flow cytometry and plasma total IgE was assayed by ELISA. Leukocytes in bronchoalveolar lavage fluid （BALF） and pulmonary histology were identified to reflect airway inflammation. It was found that RSV titers of both mice peaked on the 3rd day post infection with a much higher level of viral titer in nude mice than in BALB/c mice and a longer viral duration in nude mice （over 9 days post infection） than in BALB/c mice （6 days post infection）. RSV infection induced higher viral antigen expression in nude mice （0.267 ±0.045） than in BALB/c mice （0. 168 ±0.031）. RSV infection enhanced pulmonary TLR4 expression of BALB/c mice （51.96% ±11.34%） and nude mice （48.96% ± 12.35%） compared with each control （34.04% ±10.06% and 32.37% ±9.87% respectively）. CD4^＋ peripheral blood ceils increased in RSV infected BALB/c mice （66.51% ±2.09% ） compared with the control BALB/c mice （51.63% ±5.90%）, and CD4^＋ ceils and CD8^＋ ceils were deficient in nude mice. RSV infection increased plasma total IgE in both mice, and BALB/c mice had a larger amount of IgE on the 7th day post infection （9.02 ng/ml ±2.90 ng/ml） and on the 14th day post infection （12.76 ng/ml ±4.15 ng/ml） than corresponding nude mice （3.72 ng/ml ±1.06 ng/ml and 7.62 ng/ml ±3.08 ng/ml respectively on the 7th and 14th day post infection）. RSV infected nude mice had more severe airway inflammation than infected BALB/c mice. It is concluded that BALB/c mice and nude mice presented similar RSV infectious characteristics. However, infection of nude mice showed higher viral titer with longer duration and more severe airway inflammation, lower level of plasm total IgE and CD4^＋ peripheral blood cells, but the similar pulmonary TLR4 expression with BALB/c mice.

In vitro study on the antiviral activity of 9 extracts of traditional Chinese herbal medicine against the human respiratory syncytial virus

Objective:To study the in vitro virucidal activity of 9 extracts of traditional Chinese herbal medicine(the water extracts of Evodia lepta,Clausena lansium,Clerodendrum cyrtophyllum,Callicarpa nudiflora,Nauclea officinalis and Elaeagnus gonyanthes,the alcohol extracts of Nauclea officinalis,Elaeagnus gonyanthes and Zanthoxylumarmatum)on human respiratory syncytial virus(HRSV).Methods:The cytotoxic effect of the extracts on cells was evaluated by a cell viability assay using the CCK-8 method,a concentration of the extracts with cell viability greater than 50%was selected for the follow-up anti-HRSV effect assay,the 50%effective concentration(EC50)was assessed by an in vitro cell infection model.Results:The EC50s of the water extract from Clerodendrum cyrtophyllum,Callicarpa nudiflora and Elaeagnus gonyanthes were 0.05 mg/mL,0.03 mg/mL and 0.05 mg/mL,and the therapeutic index(TI)of them were 18.60,21.67 and 56.80 respectively.Conclusion:The water extracts of Clerodendrum cyrtophyllum,Callicarpa nudiflora and Elaeagnus gonyanthes possess the activity of anti-HRSV virus.

Surfactant Protein D for Pathological Evaluation of Infant Acute Respiratory Distress Syndrome Caused by Respiratory Syncytial Virus Infection

Pediatric respiratory syncytial viral infection (RS) usually shows relatively good outcome;however, when it accompanies acute respiratory distress syndrome (ARDS), this becomes fatal. We experienced three pediatric patients with RS + ARDS, with all showing good outcome with steroid pulse therapy. We wish to emphasize;1) steroid pulse therapy may become an option for this condition, and 2) plasma KL-6 and surfactant protein D levels may become a biomarker reflecting the disease progression/condition. Patients were, aged 1 month, 1 year 5 months, and 1 year 11 months. In all three, the respiratory condition deteriorated rapidly, requiring invasive ventilator management. Although the effectiveness of steroid treatment for ARDS is controversial, very severe condition prompted us to employ steroid pulse therapy, after which, oxygenation rapidly improved without adverse events. Plasma KL-6 and surfactant protein D levels were measured during exacerbations of ARDS, steroid pulse therapy, and recovery. Surfactant protein D levels were closely associated with oxygenation, suggesting this substance level might be a biomarker of ARDS caused by the disruption of the alveolar epithelial lining and to understand oxygenation without time lag.

Repurposing Antidiabetic Drugs against Respiratory Syncytial Viral Infection: A Docking Study

Respiratory Syncytial Viral Infection is one of the most common viral infections in the respiratory airways and is more common in infants, younger children and some adults. Although ribavirin has been used in the management of RSV infection, many effective drugs are still under development. Also, structured based drug design using computational tools has shifted the paradigm of drug design and discovery. The fusion core of the Respiratory Syncytial Viral (RSV) structure is crucial for its fusion, entry and replication in the host cell. Herein, we investigated the interruption of the formation and/or the stability of the fusion core. 15 ligands were screened and 4 (Glimepiride, Glipizide, Canagloflozin, Glibenclamide) of them are potential drug candidate for experimental validation, preclinical trials, clinical trials and route of administration optimization. To the best of our knowledge, this is the first time of reporting lead molecules against RSV from oral hypoglycemic agents. It also suggests the ligands for consideration as prophylactics in infants and adults via the inhalation route.

Genetic Characterization of Fusion Protein of Human Respiratory Syncytial Virus: Beijing

Objective Fusion protein is a subunit of the human respiratory syncytial virus(HRSV)and a potential vaccine candidate.Thus,a study on the genetic characteristics of F protein was considered important for further investigations in this field.The aim of this study was to determine the prevalence and genetic diversity of the F gene of HRSV infections in hospitalized pediatric patients in Beijing with acute lower respiratory tract infections and to compare the circulating genotypes that are currently found worldwide.Methods HRSV particles were amplified by RT-PCR and the PCR products were purified for sequencing.Further analysis was carried out by Bioedit and MEGA 3.0 biological software programs.Results Seventy-six samples(23.1%)were positive for HRSV.The percentage of cases in patients younger than 1year was 84.21%.Among the six Beijing isolates,four belonged to subgroup A,whose respective F genes shared97.0%-97.4%nucleotide sequence identity and 92.1%-93.0%amino acid sequence identity.The other two isolates belonged to subgroup B.Here,97.3%and 98.2%sequence identity were found at nucleotide and amino acid levels,respectively.Conclusions Phylogenetic analysis of nucleotide sequences revealed that those four isolates within subgroup A were monophyletic and closely related to each other,but those two within subgroup B distributed in two distinct clusters.Subgroup A and B strains co-circulated,indicating that two different transmission chains occurred in Beijing from 2003-2004.

Efficacy and mechanisms of Traditional Chinese Medicine prevention and treatment for respiratory viruses

Respiratory virus infection was the most common viral infection in clinical practice with the greatest impact,including the Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),posing a huge threat to the world's public health and human life safety.Commonly used antiviral drugs have obvious side effects and a narrow scope of application.Respiratory viruses are susceptible to infection,mutation,and prevalence,which also pose challenges to traditional antiviral drugs and vaccine development.Traditional Chinese Medicine(TCM)has a long history of treating infectious diseases,with many herbs and compounds.Its multi-component,multi-target and multi-path characteristics have made it have great advantages and potential in the development of new anti-respiratory virus drugs.This review summarized TCM for the prevention and treatment of common respiratory viruses,and provided new strategies for the research and development of new TCM antiviral drugs and for responding to infectious respiratory virus diseases.

Expert consensus on the diagnosis, treatment, and prevention of respiratory syncytial virus infections in children

Background Respiratory syncytial virus(RSV)is the leading global cause of respiratory infections and is responsible for about 3 million hospitalizations and more than 100,000 deaths annually in children younger than 5 years,representing a major global healthcare burden.There is a great unmet need for new agents and universal strategies to prevent RSV infections in early life.A multidisciplinary consensus development group comprising experts in epidemiology,infectious diseases,respiratory medicine,and methodology aims to develop the current consensus to address clinical issues of RSV infections in children.Data sources The evidence searches and reviews were conducted using electronic databases,including PubMed,Embase,Web of Science,and the Cochrane Library,using variations in terms for"respiratory syncytial virus","RSV","lower respiratory tract infection","bronchiolitis","acute","viral pneumonia","neonatal","infant""children",and"pediatric".Results Evidence-based recommendations regarding diagnosis,treatment,and prevention were proposed with a high degree of consensus.Although supportive care remains the cornerstone for the management of RSV infections,new monoclonal antibodies,vaccines,drug therapies,and viral surveillance techniques are being rolled out.Conclusions This consensus,based on international and national scientific evidence,reinforces the current recommendations and integrates the recent advances for optimal care and prevention of RSV infections.Further improvements in the management of RSV infections will require generating the highest quality of evidence through rigorously designed studies that possess little bias and sufficient capacity to identify clinically meaningful end points.

Circulation patterns and molecular characteristics of respiratory syncytial virus among hospitalized children in Tianjin,China,before and during the COVID-19 pandemic(2017–2022)

Respiratory syncytial virus(RSV)is the main pathogen that causes hospitalization for acute lower respiratory tract infections(ALRIs)in children.With the reopening of communities and schools,the resurgence of RSV in the COVID-19 post-pandemic era has become a major concern.To understand the circulation patterns and genotype variability of RSV in Tianjin before and during the COVID-19 pandemic,a total of 19,531 nasopharyngeal aspirate samples from hospitalized children in Tianjin from July 2017 to June 2022 were evaluated.Direct immunofluorescence and polymerase chain reaction(PCR)were used for screening RSV-positive samples and subtyping,respectively.Further analysis of mutations in the second hypervariable region(HVR2)of the G gene was performed through Sanger sequencing.Our results showed that 16.46%(3215/19,531)samples were RSV positive and a delayed increase in the RSV infection rates occurred in the winter season from December 2020 to February 2021,with the average RSV-positive rate of 35.77%(519/1451).The ON1,with H258Q and H266L substitutions,and the BA9,with T290I and T312I substitutions,are dominant strains that alternately circulate every 1–2 years in Tianjin,China,from July 2017 to June 2022.In addition,novel substitutions,such as N296Y,K221T,N230K,V251A in the BA9 genotype,and L226I in the ON1 genotype,emerged during the COVID-19 pandemic.Analysis of clinical characteristics indicated no significant differences between RSV-A and RSV-B groups.This study provides a theoretical basis for clinical prevention and treatment.However,further studies are needed to explore the regulatory mechanism of host immune responses to different lineages of ON1 and BA9 in the future.

Network pharmacology, molecular docking, and untargeted metabolomics reveal molecular mechanisms of multi-targets effects of Qingfei Tongluo Plaster improving respiratory syncytial virus pneumonia

Objective: Qingfei Tongluo Plaster(QFP), an improved Chinese medicine hospital preparation, is an attractive treatment option due to its well clinical efficacy, convenience, economy, and patient compliance in the treatment of respiratory syncytial virus(RSV) pneumonia. The aim of this study was to investigate the efficacy mechanism of QFP on RSV rats from the perspective of alleviating lung inflammation and further explore the changes of serum metabolites and metabolic pathways in RSV rats under the influence of QFP.Methods: This study used network pharmacological methods and molecular docking combined with molecular biology and metabolomics from multi-dimensional perspectives to screen and verify the therapeutic targets. Open online databases were used to speculate the gene targets of efficient ingredients and diseases. Then, we used the String database to examine the fundamental interaction of common targets of drugs and diseases. An online enrichment analysis was performed to predict the functional pathways. Molecular docking was applied to discover the binding modes between essential ingredients and crucial gene targets. Finally, we demonstrated the anti-inflammatory ability of QFP in the RSV-evoked pneumonia rat model and explained the mechanism in combination with the metabolomics results.Results: There were 19 critical targets defined as the core targets: tumor necrosis factor(TNF), inducible nitric oxide synthase 2(NOS2), mitogen-activated protein kinase 14(MAPK14), g1/S-specific cyclin-D1(CCND1), signal transducer and activator of transcription 1-alpha/beta(STAT1), proto-oncogene tyrosine-protein kinase Src(SRC), cellular tumor antigen p53(TP53), interleukin-6(IL6), hypoxiainducible factor 1-alpha(HIF1A), RAC-alpha serine/threonine-protein kinase(AKT1), signal transducer and activator of transcription 3(STAT3), heat shock protein HSP 90-alpha(HSP90AA1), tyrosine-protein kinase JAK2(JAK2), cyclin-dependent kinase inhibitor 1(CDKN1A), mitogen-activated protein kinase 3(MAPK3), epidermal growth factor receptor(EGFR), myc proto-oncogene protein(MYC), protein c-Fos(FOS) and transcription factor p65(RELA). QFP treated RSV pneumonia mainly through the phosphatidylinositol 3-kinase(PI3K)/RAC AKT pathway, HIF-1 pathway, IL-17 pathway, TNF pathway, and MAPK pathway. Animal experiments proved that QFP could effectively ameliorate RSV-induced pulmonary inflammation. A total of 28 metabolites underwent significant changes in the QFP treatment, and there are four metabolic pathways consistent with the KEGG pathway analyzed by network pharmacology,suggesting that they may be critical processes related to treatment.Conclusion: These results provide essential perspicacity into the mechanisms of action of QFP as a promising anti-RSV drug.

Integrating immunoinformatics and computational epitope prediction for a vaccine candidate against respiratory syncytial virus

Respiratory syncytial virus(RSV)poses a significant global health threat,especially affecting infants and the elderly.Addressing this,the present study proposes an innovative approach to vaccine design,utilizing immunoinformatics and computational strategies.We analyzed RSV's structural proteins across both subtypes A and B,identifying potential helper T lymphocyte,cytotoxic T lymphocyte,and linear B lymphocyte epitopes.Criteria such as antigenicity,allergenicity,toxicity,and cytokine-inducing potential were rigorously examined.Additionally,we evaluated the conservancy of these epitopes and their population coverage across various RSV strains.The comprehensive analysis identified six major histocompatibility complex class I(MHC-I)binding,five MHC-II binding,and three B-cell epitopes.These were integrated with suitable linkers and adjuvants to form the vaccine.Further,molecular docking and molecular dynamics simulations demonstrated stable interactions between the vaccine candidate and human Toll-like receptors(TLR4 and TLR5),with a notable preference for TLR4.Immune simulation analysis underscored the vaccine's potential to elicit a strong immune response.This study presents a promising RSV vaccine candidate and offers theoretical support,marking a significant advancement in vaccine development efforts.However,the promising in silico findings need to be further validated through additional in vivo studies.

Effects of respiratory syncytial virus infection on the airway neuronal plasticity and its relationship to the bronchial hyperresponsiveness in rats

Despite intense research efforts, the specific pathogenic mechanisms that underlie the link between respiratory syncytial virus （RSV） and childhood asthma remain unclear. Recent researches suggest that changes in the structure and function of the nerves themselves in response to changing conditions, a phenomenon known as neuronal plasticity, may also contribute to the pathophysiology of airway diseases. Therefore.

Molecular epidemiology of respiratory syncytial virus

Objective To determine the epidemiologic pattern of subgroups A and B and genotypes of respiratory syncytial virus (RSV) during two noncontinuous epidemics during 1990-1991 and 1997-1998 in Beijing Methods Nasopharyngeal secretion (NPS) samples of RSV positive or RSV isolates tested by indirect immunofluorescence (IIF) assay were classified into subgroups A and B Isolates of RSV were divided into at least six different lineages, designated NP1 NP6, by restriction mapping of the N gene Np1, 3 and 6 were given by subgroup B isolates, while NP2, 4 and 5 were given by subgroup A isolates Strains of subgroup A were further subdivided into six lineages SHL1 SHL6 on the basis of the SH gene sequence SH lineages were closely related to each other and to NP1 NP6 Strains of SHL1, 3 and 4 were closely related and belonged to NP2, SHL2 and 6 to NP4, and SHL5 to NP5 Results Of 145 RSV NPS samples from the 1997-1998 epidemic, 83 (57 2%) were of subgroup B RSV positive, 62 (42 8%) of subgroup A RSV positive The rate of occurrence of subgroup A to B strains was about 1∶1 3 Two of 10 isolates during the epidemic were subgroup A strains, whereas 8 were subgroup B strains The rate of occurrence of subgroup A to B strains was 1∶4 Eight subgroup A strains of 10 isolates from the 1990-1991 epidemic were dominant; the proportion of subgroup A to B strains was 4∶1 With 10 RSV isolates in 1997-1998, all 2 subgroup A strains gave N gene fragment restriction pattern NP4, and fell into SH lineage SHL2, whereas 8 subgroup B strains all belonged to NP3 All 8 subgroup A isolates from the 1990-1991 epidemic gave pattern NP4, and fell into SHL2, while 2 subgroup B strains all belonged to NP3 The classification of subgroups A and B deduced from NP patterns corresponded to the definition of these subgroups by monoclonal antibodies Conclusions These observations confirm that subgroups A and B or multiple lineages of RSV co circulated in Beijing, but different genome types predominated each year Moreover, very similar viruses were isolated up to more than 5 years ago, indicating that despite apparent diversity of the subgroup A strains, the separate lineages might be relatively stable