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Qousain Naqvi ST, Muhammad SA, Guo J, Zafar S, Ali A, Anderson LJ, Rostad CA, Bai B. Experimental trials of predicted CD4 + and CD8 + T-cell epitopes of respiratory syncytial virus. Front Immunol 2024; 15:1349749. [PMID: 38629077 PMCID: PMC11018974 DOI: 10.3389/fimmu.2024.1349749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 03/11/2024] [Indexed: 04/19/2024] Open
Abstract
Background Respiratory syncytial virus (RSV) is the most common cause of viral lower respiratory tract infections (LRTIs) in young children around the world and an important cause of LRTI in the elderly. The available treatments and FDA-approved vaccines for RSV only lessen the severity of the infection and are recommended for infants and elderly people. Methods We focused on developing a broad-spectrum vaccine that activates the immune system to directly combat RSV. The objective of this study is to identify CD4+ and CD8+ T-cell epitopes using an immunoinformatics approach to develop RSV vaccines. The efficacy of these peptides was validated through in-vitro and in-vivo studies involving healthy and diseased animal models. Results For each major histocompatibility complex (MHC) class-I and II, we found three epitopes of RSV proteins including F, G, and SH with an antigenic score of >0.5 and a projected SVM score of <5. Experimental validation of these peptides on female BALB/c mice was conducted before and after infection with the RSV A2 line 19f. We found that the 3RVMHCI (CD8+) epitope of the F protein showed significant results of white blood cells (19.72 × 103 cells/μl), neutrophils (6.01 × 103 cells/μl), lymphocytes (12.98 × 103 cells/μl), IgG antibodies (36.9 µg/ml), IFN-γ (86.96 ng/L), and granzyme B (691.35 pg/ml) compared to control at the second booster dose of 10 µg. Similarly, 4RVMHCII (CD4+) of the F protein substantially induced white blood cells (27.08 × 103 cells/μl), neutrophils (6.58 × 103 cells/μl), lymphocytes (16.64 × 103 cells/μl), IgG antibodies (46.13 µg/ml), IFN-γ (96.45 ng/L), and granzyme B (675.09 pg/ml). In-vitro studies showed that 4RVMHCII produced a significant level of antibodies in sera on day 45 comparable to mice infected with the virus. 4RVMHCII also induced high IFN-γ and IL-2 secretions on the fourth day of the challenge compared to the preinfectional stage. Conclusion In conclusion, epitopes of the F protein showed considerable immune response and are suitable for further validation.
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Affiliation(s)
| | - Syed Aun Muhammad
- Institute of Molecular Biology and Biotechnology, Bahauddin Zakariya University, Multan, Pakistan
| | - Jinlei Guo
- School of Intelligent Medical Engineering, Sanquan College of Xinxiang Medical University, Xinxiang, Henan, China
| | - Sidra Zafar
- Institute of Molecular Biology and Biotechnology, Bahauddin Zakariya University, Multan, Pakistan
| | - Amjad Ali
- Atta-ur-Rehman School of Applied Biosciences (ASAB), National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Larry J. Anderson
- Department of Pediatrics and Children’s Healthcare of Atlanta, Emory University, Atlanta, GA, United States
| | - Christina A. Rostad
- Department of Pediatrics and Children’s Healthcare of Atlanta, Emory University, Atlanta, GA, United States
| | - Baogang Bai
- School of Information and Technology, Wenzhou Business College, Wenzhou, Zhejiang, China
- Engineering Research Center of Intelligent Medicine, Wenzhou, Zhejiang Province, China
- The First School of Medical, School of Information and Engineering, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
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2
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Ogunbayo AE, Mogotsi MT, Sondlane H, Sabiu S, Nyaga MM. Metagenomics characterization of respiratory viral RNA pathogens in children under five years with severe acute respiratory infection in the Free State, South Africa. J Med Virol 2023; 95:e28753. [PMID: 37212321 PMCID: PMC10952945 DOI: 10.1002/jmv.28753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 03/14/2023] [Accepted: 04/03/2023] [Indexed: 05/23/2023]
Abstract
Prompt detection of viral respiratory pathogens is crucial in managing respiratory infection including severe acute respiratory infection (SARI). Metagenomics next-generation sequencing (mNGS) and bioinformatics analyses remain reliable strategies for diagnostic and surveillance purposes. This study evaluated the diagnostic utility of mNGS using multiple analysis tools compared with multiplex real-time PCR for the detection of viral respiratory pathogens in children under 5 years with SARI. Nasopharyngeal swabs collected in viral transport media from 84 children admitted with SARI as per the World Health Organization definition between December 2020 and August 2021 in the Free State Province, South Africa, were used in this study. The obtained specimens were subjected to mNGS using the Illumina MiSeq system, and bioinformatics analysis was performed using three web-based analysis tools; Genome Detective, One Codex and Twist Respiratory Viral Research Panel. With average reads of 211323, mNGS detected viral pathogens in 82 (97.6%) of the 84 patients. Viral aetiologies were established in nine previously undetected/missed cases with an additional bacterial aetiology (Neisseria meningitidis) detected in one patient. Furthermore, mNGS enabled the much needed viral genotypic and subtype differentiation and provided significant information on bacterial co-infection despite enrichment for RNA viruses. Sequences of nonhuman viruses, bacteriophages, and endogenous retrovirus K113 (constituting the respiratory virome) were also uncovered. Notably, mNGS had lower detectability rate for severe acute respiratory syndrome coronavirus 2 (missing 18/32 cases). This study suggests that mNGS, combined with multiple/improved bioinformatics tools, is practically feasible for increased viral and bacterial pathogen detection in SARI, especially in cases where no aetiological agent could be identified by available traditional methods.
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Affiliation(s)
- Ayodeji E. Ogunbayo
- Next Generation Sequencing Unit and Division of VirologyFaculty of Health Sciences, University of the Free StateBloemfonteinSouth Africa
| | - Milton T. Mogotsi
- Next Generation Sequencing Unit and Division of VirologyFaculty of Health Sciences, University of the Free StateBloemfonteinSouth Africa
| | - Hlengiwe Sondlane
- Next Generation Sequencing Unit and Division of VirologyFaculty of Health Sciences, University of the Free StateBloemfonteinSouth Africa
| | - Saheed Sabiu
- Department of Biotechnology and Food ScienceDurban University of TechnologyDurbanSouth Africa
| | - Martin M. Nyaga
- Next Generation Sequencing Unit and Division of VirologyFaculty of Health Sciences, University of the Free StateBloemfonteinSouth Africa
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Amarin JZ, Potter M, Thota J, Rankin DA, Probst V, Haddadin Z, Stewart LS, Yanis A, Talj R, Rahman H, Markus TM, Chappell J, Lindegren ML, Schaffner W, Spieker AJ, Halasa NB. Clinical characteristics and outcomes of children with single or co-detected rhinovirus-associated acute respiratory infection in Middle Tennessee. BMC Infect Dis 2023; 23:136. [PMID: 36882755 PMCID: PMC9990557 DOI: 10.1186/s12879-023-08084-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 02/15/2023] [Indexed: 03/09/2023] Open
Abstract
BACKGROUND Rhinovirus (RV) is one of the most common etiologic agents of acute respiratory infection (ARI), which is a leading cause of morbidity and mortality in young children. The clinical significance of RV co-detection with other respiratory viruses, including respiratory syncytial virus (RSV), remains unclear. We aimed to compare the clinical characteristics and outcomes of children with ARI-associated RV-only detection and those with RV co-detection-with an emphasis on RV/RSV co-detection. METHODS We conducted a prospective viral surveillance study (11/2015-7/2016) in Nashville, Tennessee. Children < 18 years old who presented to the emergency department (ED) or were hospitalized with fever and/or respiratory symptoms of < 14 days duration were eligible if they resided in one of nine counties in Middle Tennessee. Demographics and clinical characteristics were collected by parental interviews and medical chart abstractions. Nasal and/or throat specimens were collected and tested for RV, RSV, metapneumovirus, adenovirus, parainfluenza 1-4, and influenza A-C using reverse transcription quantitative polymerase chain reaction assays. We compared the clinical characteristics and outcomes of children with RV-only detection and those with RV co-detection using Pearson's χ2 test for categorical variables and the two-sample t-test with unequal variances for continuous variables. RESULTS Of 1250 children, 904 (72.3%) were virus-positive. RV was the most common virus (n = 406; 44.9%), followed by RSV (n = 207; 19.3%). Of 406 children with RV, 289 (71.2%) had RV-only detection, and 117 (28.8%) had RV co-detection. The most common virus co-detected with RV was RSV (n = 43; 36.8%). Children with RV co-detection were less likely than those with RV-only detection to be diagnosed with asthma or reactive airway disease both in the ED and in-hospital. We did not identify differences in hospitalization, intensive care unit admission, supplemental oxygen use, or length of stay between children with RV-only detection and those with RV co-detection. CONCLUSION We found no evidence that RV co-detection was associated with poorer outcomes. However, the clinical significance of RV co-detection is heterogeneous and varies by virus pair and age group. Future studies of RV co-detection should incorporate analyses of RV/non-RV pairs and include age as a key covariate of RV contribution to clinical manifestations and infection outcomes.
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Affiliation(s)
- Justin Z Amarin
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA.
| | - Molly Potter
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Jyotsna Thota
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Danielle A Rankin
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA.,Vanderbilt Epidemiology PhD Program, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Varvara Probst
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Zaid Haddadin
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Laura S Stewart
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Ahmad Yanis
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Rana Talj
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Herdi Rahman
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Tiffanie M Markus
- Department of Health Policy, Vanderbilt University Medical Center, Nashville, TN, USA
| | - James Chappell
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
| | - Mary Lou Lindegren
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA.,Department of Health Policy, Vanderbilt University Medical Center, Nashville, TN, USA
| | - William Schaffner
- Department of Health Policy, Vanderbilt University Medical Center, Nashville, TN, USA.,Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Andrew J Spieker
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Natasha B Halasa
- Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North D7235, Nashville, TN, 37232, USA
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Influence of Sex on Respiratory Syncytial Virus Genotype Infection Frequency and Nasopharyngeal Microbiome. J Virol 2023; 97:e0147222. [PMID: 36815771 PMCID: PMC10062153 DOI: 10.1128/jvi.01472-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
Respiratory syncytial virus (RSV) has a significant health burden in children, older adults, and the immunocompromised. However, limited effort has been made to identify emergence of new RSV genotypes' frequency of infection and how the combination of nasopharyngeal microbiome and viral genotypes impact RSV disease outcomes. In an observational cohort designed to capture the first infant RSV infection, we employed multi-omics approaches to sequence 349 RSV complete genomes and matched nasopharyngeal microbiomes, during which the 2012/2013 season was dominated by RSV-A, whereas 2013 and 2014 was dominated by RSV-B. We found non-G-72nt-duplicated RSV-A strains were more frequent in male infants (P = 0.02), whereas G-72nt-duplicated genotypes (which is ON1 lineage) were seen equally in both males and females. DESeq2 testing of the nasal microbiome showed Haemophilus was significantly more abundant in infants with RSV-A infection compared to infants with RSV-B infection (adjusted P = 0.002). In addition, the broad microbial clustering of the abundant genera was significantly associated with infant sex (P = 0.03). Overall, we show sex differences in infection by RSV genotype and host nasopharyngeal microbiome, suggesting an interaction between host genetics, virus genotype, and associated nasopharyngeal microbiome. IMPORTANCE Respiratory syncytial virus (RSV) is one of the leading causes of lower respiratory tract infections in young children and is responsible for high hospitalization rates and morbidity in infants and the elderly. To understand how the emergence of RSV viral genotypes and viral-respiratory microbiome interactions contribute to infection frequency and severity, we utilized an observational cohort designed to capture the first infant RSV infection we employed multi-omics approaches to sequence 349 RSV complete genomes and matched nasopharyngeal microbiomes. We found non-G-72nt-duplicated RSV-A genotypes were more frequent in male infants, whereas G-72nt-duplicated RSV-A strains (ON1 lineage) were seen equally in both males and females. Microbiome analysis show Haemophilus was significantly more abundant in infants with RSV-A compared to infants with RSV-B infection and the microbial clustering of the abundant genera was associated with infant sex. Overall, we show sex differences in RSV genotype-nasopharyngeal microbiome, suggesting an interaction host genetics-virus-microbiome interaction.
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5
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Zhou X, Jiang M, Wang F, Qian Y, Song Q, Sun Y, Zhu R, Wang F, Qu D, Cao L, Ma L, Xu Y, De R, Zhao L. Immune escaping of the novel genotypes of human respiratory syncytial virus based on gene sequence variation. Front Immunol 2023; 13:1084139. [PMID: 36703972 PMCID: PMC9871593 DOI: 10.3389/fimmu.2022.1084139] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 12/19/2022] [Indexed: 01/11/2023] Open
Abstract
Purpose Immune escaping from host herd immunity has been related to changes in viral genomic sequences. The study aimed to understand the diverse immune responses to different subtypes or genotypes of human respiratory syncytial virus (RSV) in pediatric patients. Methods The genomic sequences of different subtypes or RSV genotypes, isolated from Beijing patients, were sequenced and systematically analyzed. Specifically, the antiviral effects of Palivizumab and the cross-reactivity of human sera from RSV-positive patients to different subtypes or genotypes of RSV were determined. Then, the level of 38 cytokines and chemokines in respiratory and serum samples from RSV-positive patients was evaluated. Results The highest nucleotide and amino acid variations and the secondary and tertiary structure diversities among different subtypes or genotypes of RSV were found in G, especially for genotype ON1 with a 72bp-insertion compared to NA1 in subtype A, while more mutations of F protein were found in the NH-2 terminal, including the antigenic site II, the target of Palivizumab, containing one change N276S. Palivizumab inhibited subtype A with higher efficiency than subtype B and had stronger inhibitory effects on the reference strains than on isolated strains. However, RSV-positive sera had stronger inhibitory effects on the strains in the same subtypes or genotypes of RSV. The level of IFN-α2, IL-1α, and IL-1β in respiratory specimens from patients with NA1 was lower than those with ON1, while there were higher TNFα, IFNγ, IL-1α, and IL-1β in the first serum samples from patients with ON1 compared to those with BA9 of subtype B. Conclusions Diverse host immune responses were correlated with differential subtypes and genotypes of RSV in pediatric patients, demonstrating the impact of viral genetics on host immunity.
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Affiliation(s)
- Xiaohe Zhou
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China
| | - Mingli Jiang
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China
| | - Fengjie Wang
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China
| | - Yuan Qian
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China
| | - Qinwei Song
- Clinical Laboratory, Affiliated Children’s Hospital, Capital Institute of Pediatrics, Beijing, China
| | - Yu Sun
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China
| | - Runan Zhu
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China
| | - Fang Wang
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China
| | - Dong Qu
- Intensive Care Unit, Affiliated Children’s Hospital, Capital Institute of Pediatrics, Beijing, China
| | - Ling Cao
- Department of Respiratory, Affiliated Children’s Hospital, Capital Institute of Pediatrics, Beijing, China
| | - Lijuan Ma
- Clinical Laboratory, Affiliated Children’s Hospital, Capital Institute of Pediatrics, Beijing, China
| | - Yanpeng Xu
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China
| | - Ri De
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China,*Correspondence: Linqing Zhao, ; Ri De,
| | - Linqing Zhao
- Laboratory of Virology, Capital Institute of Pediatrics, Beijing, China,Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, China,*Correspondence: Linqing Zhao, ; Ri De,
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Perchetti GA, Wilcox N, Chu HY, Katz J, Khatry SK, LeClerq SC, Tielsch JM, Jerome KR, Englund JA, Kuypers J. Human Metapneumovirus Infection and Genotyping of Infants in Rural Nepal. J Pediatric Infect Dis Soc 2021; 10:408-416. [PMID: 33137178 DOI: 10.1093/jpids/piaa118] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 09/22/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND Acute respiratory tract infections are a serious clinical burden in infants; human metapneumovirus (HMPV) is an important etiological agent. We investigated genotypic variation and molecular epidemiological patterns among infants infected with HMPV in Sarlahi, Nepal, to better characterize infection in a rural, low-resource setting. METHODS Between May 2011 and April 2014, mid-nasal swabs were collected from 3528 infants who developed respiratory symptoms during a longitudinal maternal influenza vaccine study. Sequencing glycoprotein genes permitted genotyping and analyses among subtypes. RESULTS HMPV was detected by reverse-transcriptase polymerase chain reaction (RT-PCR) in 187 (5%) infants, with seasonality observed during fall and winter months. Phylogenetic investigation of complete and partial coding sequences for the F and G genes, respectively, revealed that 3 genotypes were circulating: A2, B1, and B2. HMPV-B was most frequently detected with a single type predominating each season. Both HMPV genotypes exhibited comparable median viral loads. Clinically significant differences between genotypes were limited to increased cough duration and general respiratory symptoms for type B. CONCLUSIONS In rural Nepal, multiple HMPV genotypes circulate simultaneously with an alternating predominance of a single genotype and definitive seasonality. No difference in viral load was detected by genotype and symptom severity was not correlated with RT-PCR cycle threshold or genotype.
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Affiliation(s)
- Garrett A Perchetti
- Department of Laboratory Medicine & Pathology, University of Washington, Seattle, Washington, USA
| | - Naomi Wilcox
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Helen Y Chu
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Joanne Katz
- Department of International Health, Johns Hopkins University, Baltimore, Maryland, USA
| | - Subarna K Khatry
- Department of International Health, Johns Hopkins University, Baltimore, Maryland, USA.,Nepal Nutrition Intervention Project Sarlahi, Kathmandu, Nepal
| | - Steven C LeClerq
- Department of International Health, Johns Hopkins University, Baltimore, Maryland, USA.,Nepal Nutrition Intervention Project Sarlahi, Kathmandu, Nepal
| | - James M Tielsch
- Department of Global Health, George Washington University, Washington, DC, USA
| | - Keith R Jerome
- Department of Laboratory Medicine & Pathology, University of Washington, Seattle, Washington, USA.,Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Janet A Englund
- Department of Pediatrics, University of Washington, Seattle Children's Research Institute, Seattle, Washington, USA
| | - Jane Kuypers
- Department of Laboratory Medicine & Pathology, University of Washington, Seattle, Washington, USA
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7
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The specific features of the developing T cell compartment of the neonatal lung are a determinant of respiratory syncytial virus immunopathogenesis. PLoS Pathog 2021; 17:e1009529. [PMID: 33909707 PMCID: PMC8109812 DOI: 10.1371/journal.ppat.1009529] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 05/10/2021] [Accepted: 04/05/2021] [Indexed: 11/19/2022] Open
Abstract
The human respiratory syncytial virus (RSV) is a major cause of severe lower respiratory tract infections in infants, possibly due to the properties of the immature neonatal pulmonary immune system. Using the newborn lamb, a classical model of human lung development and a translational model of RSV infection, we aimed to explore the role of cell-mediated immunity in RSV disease during early life. Remarkably, in healthy conditions, the developing T cell compartment of the neonatal lung showed major differences to that seen in the mature adult lung. The most striking observation being a high baseline frequency of bronchoalveolar IL-4-producing CD4+ and CD8+ T cells, which declined progressively over developmental age. RSV infection exacerbated this pro-type 2 environment in the bronchoalveolar space, rather than inducing a type 2 response per se. Moreover, regulatory T cell suppressive functions occurred very early to dampen this pro-type 2 environment, rather than shutting them down afterwards, while γδ T cells dropped and failed to produce IL-17. Importantly, RSV disease severity was related to the magnitude of those unconventional bronchoalveolar T cell responses. These findings provide novel insights in the mechanisms of RSV immunopathogenesis in early life, and constitute a major step for the understanding of RSV disease severity.
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Narayanan S, Elesela S, Rasky AJ, Morris SH, Kumar S, Lombard D, Lukacs NW. ER stress protein PERK promotes inappropriate innate immune responses and pathogenesis during RSV infection. J Leukoc Biol 2021; 111:379-389. [PMID: 33866604 DOI: 10.1002/jlb.3a0520-322rr] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The activation of dendritic cells (DC) during respiratory viral infections is central to directing the immune response and the pathologic outcome. In these studies, the effect of RSV infection on development of ER stress responses and the impact on innate immunity was examined. The upregulation of ER stress was closely associated with the PERK pathway through the upregulation of CHOP in RSV infected DC. The inhibition of PERK corresponded with decreased EIF2a phosphorylation but had no significant effect on Nrf2 in DC, two primary pathways regulated by PERK. Subsequent studies identified that by blocking PERK activity in infected DC an altered ER stress response and innate cytokine profile was observed with the upregulation of IFNβ and IL-12, coincident to the down regulation of IL-1β. When mitochondria respiration was assessed in PERK deficient DC there were increased dysfunctional mitochondria after RSV infection that resulted in reduced oxygen consumption rates (OCR) and ATP production indicating altered cellular metabolism. Use of a CD11c targeted genetic deleted murine model, RSV infection was characterized by reduced inflammation and diminished mucus staining as well as reduced mucus-associated gene gob5 expression. The assessment of the cytokine responses showed decreased IL-13 and IL-17 along with diminished IL-1β in the lungs of PERK deficient infected mice. When PERK-deficient animals were assessed in parallel for lung leukocyte numbers, animals displayed significantly reduced myeloid and activated CD4 and CD8 T cell numbers. Thus, the PERK activation pathway may provide a rational target for altering the severe outcome of an RSV infection through modifying immune responses.
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Affiliation(s)
- Samanthi Narayanan
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - Srikanth Elesela
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA.,Mary H. Weiser Food Allergy Center, University of Michigan, Ann Arbor, Michigan, USA
| | - Andrew J Rasky
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - Susan H Morris
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - Surinder Kumar
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - David Lombard
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA
| | - Nicholas W Lukacs
- Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA.,Mary H. Weiser Food Allergy Center, University of Michigan, Ann Arbor, Michigan, USA
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Li Y, Chen L, Zhang P, Bhagirath AY, Duan K. ClpV3 of the H3-Type VI Secretion System (H3-T6SS) Affects Multiple Virulence Factors in Pseudomonas aeruginosa. Front Microbiol 2020; 11:1096. [PMID: 32547522 PMCID: PMC7273116 DOI: 10.3389/fmicb.2020.01096] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 05/01/2020] [Indexed: 11/13/2022] Open
Abstract
The type VI secretion system (T6SS) is a toxic effector delivery apparatus widely distributed in Gram-negative bacteria. The opportunistic pathogen Pseudomonas aeruginosa encodes three T6SSs, namely H1-, H2-, and H3-T6SS. Each T6SS possesses its own effectors and their roles are not yet fully understood. Here, we report that an H3-T6SS deletion mutant PAO1(ΔclpV3) significantly affected the virulence-related phenotypes including pyocyanin production, biofilm formation, proteolytic activity, and motilities. Most interestingly, the expression of T3SS genes was markedly affected, indicating a link between H3-T6SS and T3SS. RNA-Sequencing was performed to globally identify the genes differentially expressed when H3-T6SS was inactivated and the results obtained correlated well with the observed phenotypes. Interestingly, the expressions of T2SS, T3SS, H2-T6SS, and H3-T6SS were all significantly decreased, while H1-T6SS was increased in the PAO1(ΔclpV3) strain. We also observed that the intracellular concentration of secondary messenger cAMP was reduced in PAO1(ΔclpV3), and the c-di-GMP level was also decreased as indicated by the decreased cdrA reporter activity. Finally, by using a Galleria mellonella infection model, we show that H3-T6SS plays a key role in the pathogenicity of P. aeruginosa in vivo. Overall, our study highlights the unique connection of H3-T6SS in P. aeruginosa with T3SS, pyocyanin production, biofilm formation and in vivo pathogenicity.
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Affiliation(s)
- Yanqi Li
- Department of Oral Biology, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Lin Chen
- College of Life Sciences, Northwest University, Xi'an, China
| | - Pansong Zhang
- College of Life Sciences, Northwest University, Xi'an, China
| | - Anjali Y Bhagirath
- Department of Oral Biology, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Kangmin Duan
- Department of Oral Biology, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada.,Department of Medical Microbiology & Infectious Diseases, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
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10
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Analysis of influenza data generated by four epidemiological surveillance laboratories in Mexico, 2010-2016. Epidemiol Infect 2020; 147:e183. [PMID: 31063113 PMCID: PMC6518608 DOI: 10.1017/s0950268819000694] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The disease caused by the influenza virus is a global public health problem due to its high rates of morbidity and mortality. Thus, analysis of the information generated by epidemiological surveillance systems has vital importance for health decision making. A retrospective analysis was performed using data generated by the four molecular diagnostic laboratories of the Mexican Social Security Institute between 2010 and 2016. Demographics, influenza positivity, seasonality, treatment choices and vaccination status analyses were performed for the vaccine according to its composition for each season. In all cases, both the different influenza subtypes and different age groups were considered separately. The circulation of A/H1N1pdm09 (48.7%), influenza A/H3N2 (21.1%), influenza B (12.6%), influenza A not subtyped (11%) and influenza A/H1N1 (6.6%) exhibited well-defined annual seasonality between November and March, and there were significant increases in the number of cases every 2 years. An inadequate use of oseltamivir was determined in 38% of cases, and the vaccination status in general varied between 12.1 and 18.5% depending on the season. Our results provide current information about influenza in Mexico and demonstrate the need to update both operational case definitions and medical practice guidelines to reduce the inappropriate use of antibiotics and antivirals.
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11
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A Contemporary View of Respiratory Syncytial Virus (RSV) Biology and Strain-Specific Differences. Pathogens 2019; 8:pathogens8020067. [PMID: 31117229 PMCID: PMC6631838 DOI: 10.3390/pathogens8020067] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 05/01/2019] [Accepted: 05/04/2019] [Indexed: 01/09/2023] Open
Abstract
Respiratory syncytial virus (RSV) is a human respiratory pathogen which remains a leading viral cause of hospitalizations and mortality among infants in their first year of life. Here, we review the biology of RSV, the primary laboratory isolates or strains which have been used to best characterize the virus since its discovery in 1956, and discuss the implications for genetic and functional variations between the established laboratory strains and the recently identified clinical isolates.
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12
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González-Parra G, Dobrovolny HM. The rate of viral transfer between upper and lower respiratory tracts determines RSV illness duration. J Math Biol 2019; 79:467-483. [PMID: 31011792 DOI: 10.1007/s00285-019-01364-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 04/11/2019] [Indexed: 12/26/2022]
Abstract
Respiratory syncytial virus can lead to serious lower respiratory infection (LRI), particularly in children and the elderly. LRI can cause longer infections, lingering respiratory problems, and higher incidence of hospitalization. In this paper, we use a simplified ordinary differential equation model of viral dynamics to study the role of transport mechanisms in the occurrence of LRI. Our model uses two compartments to simulate the upper respiratory tract and the lower respiratory tract (LRT) and assumes two distinct types of viral transfer between the two compartments: diffusion and advection. We find that a range of diffusion and advection values lead to long-lasting infections in the LRT, elucidating a possible mechanism for the severe LRI infections observed in humans.
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13
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Ellwanger JH, Chies JAB. Host immunogenetics in tick-borne encephalitis virus infection-The CCR5 crossroad. Ticks Tick Borne Dis 2019; 10:729-741. [PMID: 30879988 DOI: 10.1016/j.ttbdis.2019.03.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 02/18/2019] [Accepted: 03/10/2019] [Indexed: 12/17/2022]
Abstract
The human Tick-borne encephalitis virus (TBEV) infection is a complex event encompassing factors derived from the virus itself, the vectors, the final host, and the environment as well. Classically, genetic traits stand out among the human factors that modify the susceptibility and progression of infectious diseases. However, and although this is a changing scenario, studies evaluating the genetic factors that affect the susceptibility specifically to TBEV infection and TBEV-related diseases are still scarce. There are already some interesting pieces of evidence showing that some genes and polymorphisms have a real impact on TBEV infection. Also, the inflammatory processes involving tick-human interactions began to be understood in greater detail. This review focuses on the immunogenetic and inflammatory aspects concerning tick-host interactions, TBEV infections, and tick-borne encephalitis. Of note, it has been described that polymorphisms in CD209, GSTM1, IL-10, IL-28B, MMP9, OAS2, OAS3, and TLR3 have a statistically significant impact on TBEV infection. Besides, CCR5, its ligands, and the CCR5Δ32 genetic variant seem to have a very important influence on the infection and its immune responses. Taking this information into consideration, a special discussion regarding the effects of CCR5 on TBEV infection and tick-borne encephalitis will be presented. Emerging topics (such as exosomes, evasins, and CCR5 blockers) involving immunological and inflammatory aspects of TBEV-human interactions will also be addressed. Lastly, the current picture of TBEV infection and the importance to address the TBEV-associated problems through the One Health perspective will be discussed.
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Affiliation(s)
- Joel Henrique Ellwanger
- Laboratory of Immunobiology and Immunogenetics, Department of Genetics, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, Brazil
| | - José Artur Bogo Chies
- Laboratory of Immunobiology and Immunogenetics, Department of Genetics, Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, Brazil.
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14
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Abstract
Pneumonia is a type of acute lower respiratory infection that is common and severe. The outcome of lower respiratory infection is determined by the degrees to which immunity is protective and inflammation is damaging. Intercellular and interorgan signaling networks coordinate these actions to fight infection and protect the tissue. Cells residing in the lung initiate and steer these responses, with additional immunity effectors recruited from the bloodstream. Responses of extrapulmonary tissues, including the liver, bone marrow, and others, are essential to resistance and resilience. Responses in the lung and extrapulmonary organs can also be counterproductive and drive acute and chronic comorbidities after respiratory infection. This review discusses cell-specific and organ-specific roles in the integrated physiological response to acute lung infection, and the mechanisms by which intercellular and interorgan signaling contribute to host defense and healthy respiratory physiology or to acute lung injury, chronic pulmonary disease, and adverse extrapulmonary sequelae. Pneumonia should no longer be perceived as simply an acute infection of the lung. Pneumonia susceptibility reflects ongoing and poorly understood chronic conditions, and pneumonia results in diverse and often persistent deleterious consequences for multiple physiological systems.
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Affiliation(s)
- Lee J Quinton
- Pulmonary Center, Boston University School of Medicine , Boston, Massachusetts
| | - Allan J Walkey
- Pulmonary Center, Boston University School of Medicine , Boston, Massachusetts
| | - Joseph P Mizgerd
- Pulmonary Center, Boston University School of Medicine , Boston, Massachusetts
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15
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Abstract
Pneumonia is an important cause of morbidity and mortality. However, pneumonia is an unusual outcome of respiratory infection. Most of the time, microbes in the lung can be controlled by a combination of constitutive and recruited defense mechanisms. Inflammation is a key component of recruited defenses. Variations in inflammation that influence pneumonia susceptibility and severity are considered here.
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Affiliation(s)
- Joseph P Mizgerd
- Pulmonary Center, Boston University School of Medicine, 72 East Concord Street, Boston, MA 02115, USA.
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16
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Rahman MZ, Sumiya M, Sahabuddin M, Pell LG, Gubbay JB, Rahman R, Momtaz F, Azmuda N, Shanta SS, Jahan I, Rahman M, Mahmud AA, Roth DE, Morris SK. Genetic characterization of human metapneumovirus identified through community and facility-based surveillance of infants in Dhaka, Bangladesh. J Med Virol 2018; 91:549-554. [PMID: 30372530 DOI: 10.1002/jmv.25351] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Accepted: 10/16/2018] [Indexed: 11/09/2022]
Abstract
BACKGROUND Acute respiratory infection (ARI) is a leading cause of morbidity and mortality in children in low and middle-income countries. Human metapneumovirus (hMPV) is one of the most common viral etiological agents for ARIs in children. OBJECTIVES In this study, we explored the genotypic diversity and the epidemiology of hMPV among infants in Dhaka, Bangladesh. STUDY DESIGN Between December 2014 and August 2016, a total of 3810 mid-turbinate nasal swab samples were collected from infants (0 to 6 months of age) who met clinical ARI criteria, as a part of a prospective ARI cohort study. hMPV was detected using polymerase chain reaction, and genotyped by sequencing and phylogenetic analysis. RESULTS hMPV was identified in 206 (5.4%) nasal swab specimens. One-tenth of the hMPV-positive swabs (n = 19) were also positive for other respiratory viruses. hMPV activity peaked in January and September in 2015; however, no seasonal pattern of hMPV infection was detected. Phylogenetic analyses of the N and F gene-fragments revealed that the hMPV strains circulating in Dhaka, Bangladesh, belonged to three genotypes: A2b, A2c, and B1. Genotype A (57%) was the predominant hMPV genotype circulating in Bangladesh during the study period. CONCLUSION This study describes both the epidemiology of hMPV infection and its genotypic strain diversity in Dhaka, Bangladesh.
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Affiliation(s)
| | - Mariya Sumiya
- Infectious Diseases Division (IDD), icddr,b, Dhaka, Bangladesh
| | | | - Lisa G Pell
- Centre for Global Child Health and Child Health Evaluative Sciences, Sick Kids Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada
| | - Jonathan B Gubbay
- Department of Pediatrics, Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada.,Public Health Ontario, Toronto, Ontario, Canada
| | - Rajibur Rahman
- Infectious Diseases Division (IDD), icddr,b, Dhaka, Bangladesh
| | - Farhana Momtaz
- Infectious Diseases Division (IDD), icddr,b, Dhaka, Bangladesh
| | - Nafisa Azmuda
- Department of Microbiology, Jahangirnagar University, Dhaka, Bangladesh
| | - Shaila S Shanta
- Nutrition and Clinical Services Division (NCSD), icddr,b, Dhaka, Bangladesh
| | - Ishrat Jahan
- Maternal and Child Health Training Institute (MCHTI), Ministry of Health and Family Welfare, Government of Bangladesh, Dhaka, Bangladesh
| | | | - Abdullah A Mahmud
- Nutrition and Clinical Services Division (NCSD), icddr,b, Dhaka, Bangladesh
| | - Daniel E Roth
- Centre for Global Child Health and Child Health Evaluative Sciences, Sick Kids Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Pediatrics, Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada
| | - Shaun K Morris
- Centre for Global Child Health and Child Health Evaluative Sciences, Sick Kids Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Pediatrics, Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada
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17
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Chen D, Song Q, Zhu R, Qian Y, Sun Y, Deng J, Wang F, Ding Y, Tian R, Liu C, Zhu W, Zhao L. Human rhinovirus C infection is associated with asthma in children determined by xTAG respiratory viral panel FAST. Virol Sin 2018; 32:171-174. [PMID: 28389993 PMCID: PMC6598901 DOI: 10.1007/s12250-016-3935-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Dongmei Chen
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Qinwei Song
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Runan Zhu
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Yuan Qian
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Yu Sun
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Jie Deng
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Fang Wang
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Yaxin Ding
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Run Tian
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Chuanhe Liu
- Division of Respiratory Diseases, Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Wenjing Zhu
- Division of Respiratory Diseases, Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing, 100020, China
| | - Linqing Zhao
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing, 100020, China.
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18
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Fernandes-Matano L, Monroy-Muñoz IE, Angeles-Martínez J, Sarquiz-Martinez B, Palomec-Nava ID, Pardavé-Alejandre HD, Santos Coy-Arechavaleta A, Santacruz-Tinoco CE, González-Ibarra J, González-Bonilla CR, Muñoz-Medina JE. Prevalence of non-influenza respiratory viruses in acute respiratory infection cases in Mexico. PLoS One 2017; 12:e0176298. [PMID: 28467515 PMCID: PMC5415110 DOI: 10.1371/journal.pone.0176298] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 04/07/2017] [Indexed: 01/10/2023] Open
Abstract
Background Acute respiratory infections are the leading cause of morbidity and mortality worldwide. Although a viral aetiological agent is estimated to be involved in up to 80% of cases, the majority of these agents have never been specifically identified. Since 2009, diagnostic and surveillance efforts for influenza virus have been applied worldwide. However, insufficient epidemiological information is available for the many other respiratory viruses that can cause Acute respiratory infections. Methods This study evaluated the presence of 14 non-influenza respiratory viruses in 872 pharyngeal exudate samples using RT-qPCR. All samples met the operational definition of a probable case of an influenza-like illness or severe acute respiratory infection and had a previous negative result for influenza by RT-qPCR. Results The presence of at least one non-influenza virus was observed in 312 samples (35.8%). The most frequent viruses were rhinovirus (RV; 33.0%), human respiratory syncytial virus (HRSV; 30.8%) and human metapneumovirus (HMPV; 10.6%). A total of 56 cases of co-infection (17.9%) caused by 2, 3, or 4 viruses were identified. Approximately 62.5% of all positive cases were in children under 9 years of age. Conclusion In this study, we identified 13 non-influenza respiratory viruses that could occur in any season of the year. This study provides evidence for the prevalence and seasonality of a wide range of respiratory viruses that circulate in Mexico and constitute a risk for the population. Additionally, our data suggest that including these tests more widely in the diagnostic algorithm for influenza may reduce the use of unnecessary antibiotics, reduce the hospitalisation time, and enrich national epidemiological data with respect to the infections caused by these viruses.
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Affiliation(s)
| | - Irma Eloísa Monroy-Muñoz
- Laboratorio de Genómica, Departamento de Genética y Genómica Humana, Instituto Nacional de Perinatología “Isidro Espinosa de los Reyes”. Ciudad de México, México
| | - Javier Angeles-Martínez
- Laboratorio de Genómica, Departamento de Biología Molecular, Instituto Nacional de Cardiología “Ignacio Chávez”. Ciudad de México, México
| | - Brenda Sarquiz-Martinez
- Laboratorio Central de Epidemiología, Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social. Ciudad de México, México
| | - Iliana Donají Palomec-Nava
- Laboratorio Central de Epidemiología, Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social. Ciudad de México, México
| | - Hector Daniel Pardavé-Alejandre
- Laboratorio Central de Epidemiología, Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social. Ciudad de México, México
| | - Andrea Santos Coy-Arechavaleta
- Laboratorio Central de Epidemiología, Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social. Ciudad de México, México
| | - Clara Esperanza Santacruz-Tinoco
- Laboratorio Central de Epidemiología, Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social. Ciudad de México, México
| | - Joaquín González-Ibarra
- División de Laboratorios de Vigilancia e Investigación Epidemiológica, Instituto Mexicano del Seguro Social. Ciudad de México, México
| | - Cesar Raúl González-Bonilla
- División de Laboratorios de Vigilancia e Investigación Epidemiológica, Instituto Mexicano del Seguro Social. Ciudad de México, México
| | - José Esteban Muñoz-Medina
- Laboratorio Central de Epidemiología, Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social. Ciudad de México, México
- * E-mail:
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19
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Zhao M, Zhu WJ, Qian Y, Sun Y, Zhu RN, Deng J, Wang F, Ding YX, Tian R, Liu CH, Meng LH, Zhao LQ. Association of Different Human Rhinovirus Species with Asthma in Children: A Preliminary Study. Chin Med J (Engl) 2017; 129:1513-8. [PMID: 27364785 PMCID: PMC4931255 DOI: 10.4103/0366-6999.184463] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Background: Human rhinoviruses (HRVs) are divided into three genetic species: HRV-A, HRV-B, and HRV-C. The association of different HRV species with asthma in children in China has not yet been evaluated. This preliminary study aimed to assess the associations between different HRV species, particularly HRV-C, and asthma in young children in China. Methods: A total of 702 nasopharyngeal aspirates were obtained from 155 children with asthma (asthma group), 461 children with acute respiratory infection (ARI) without asthma (nonasthma ARI group), and 86 children from the control group. Semi-nested polymerase chain reaction (PCR) was used to detect HRVs, and PCR products were sequenced for species identification. Epidemiological characteristics of HRV-positive cases were analyzed. Results: HRVs were the most common pathogen (15.4%; 108/702) in the patients in this study. The prevalence of HRV was significantly different (F = 20.633, P = 0.000) between the asthma (25.8%) and nonasthma ARI groups (11.1%). Phylogenetic analysis indicated that in the 108 cases positive for HRVs, 41 were identified as HRV-A, 8 as HRV-B, and 56 as HRV-C. Comparing the asthma with the nonasthma ARI group, Spearman's rank correlation analysis revealed an association between HRV-A (P < 0.05) and C (P < 0.01) and asthma, confirmed by regression analysis, with odds ratios of 2.2 (HRV-A) and 4.2 (HRV-C). Conclusions: Our data revealed a high prevalence of HRVs in children in China, regardless of clinical status. HRV-C was the dominant species and may be one of the key factors in the association of HRVs with asthma.
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Affiliation(s)
- Min Zhao
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Wen-Jing Zhu
- Division of Respiratory Diseases, Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - Yuan Qian
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Yu Sun
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Ru-Nan Zhu
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Jie Deng
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Fang Wang
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Ya-Xin Ding
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Run Tian
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
| | - Chuan-He Liu
- Division of Respiratory Diseases, Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China
| | - Ling-Hui Meng
- Statistical Office, Capital Institute of Pediatrics, Beijing 100020, China
| | - Lin-Qing Zhao
- Laboratory of Virology, Beijing Key Laboratory of Etiology of Viral Diseases in Children, Capital Institute of Pediatrics, Beijing 100020, China
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20
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Zhao Y, Jamaluddin M, Zhang Y, Sun H, Ivanciuc T, Garofalo RP, Brasier AR. Systematic Analysis of Cell-Type Differences in the Epithelial Secretome Reveals Insights into the Pathogenesis of Respiratory Syncytial Virus-Induced Lower Respiratory Tract Infections. THE JOURNAL OF IMMUNOLOGY 2017; 198:3345-3364. [PMID: 28258195 DOI: 10.4049/jimmunol.1601291] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 01/23/2017] [Indexed: 11/19/2022]
Abstract
Lower respiratory tract infections from respiratory syncytial virus (RSV) are due, in part, to secreted signals from lower airway cells that modify the immune response and trigger airway remodeling. To understand this process, we applied an unbiased quantitative proteomics analysis of the RSV-induced epithelial secretory response in cells representative of the trachea versus small airway bronchiolar cells. A workflow was established using telomerase-immortalized human epithelial cells that revealed highly reproducible cell type-specific differences in secreted proteins and nanoparticles (exosomes). Approximately one third of secretome proteins are exosomal; the remainder are from lysosomal and vacuolar compartments. We applied this workflow to three independently derived primary human cultures from trachea versus bronchioles. A total of 577 differentially expressed proteins from control supernatants and 966 differentially expressed proteins from RSV-infected cell supernatants were identified at a 1% false discovery rate. Fifteen proteins unique to RSV-infected primary human cultures from trachea were regulated by epithelial-specific ets homologous factor. A total of 106 proteins unique to RSV-infected human small airway epithelial cells was regulated by the transcription factor NF-κB. In this latter group, we validated the differential expression of CCL20/macrophage-inducible protein 3α, thymic stromal lymphopoietin, and CCL3-like 1 because of their roles in Th2 polarization. CCL20/macrophage-inducible protein 3α was the most active mucin-inducing factor in the RSV-infected human small airway epithelial cell secretome and was differentially expressed in smaller airways in a mouse model of RSV infection. These studies provide insights into the complexity of innate responses and regional differences in the epithelial secretome participating in RSV lower respiratory tract infection-induced airway remodeling.
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Affiliation(s)
- Yingxin Zhao
- Institute for Translational Sciences, University of Texas Medical Branch, Galveston, TX 77555.,Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555.,Sealy Center for Molecular Medicine, University of Texas Medical Branch, Galveston, TX 77555; and
| | - Mohammad Jamaluddin
- Institute for Translational Sciences, University of Texas Medical Branch, Galveston, TX 77555.,Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555
| | - Yueqing Zhang
- Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555
| | - Hong Sun
- Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555
| | - Teodora Ivanciuc
- Department of Pediatrics, University of Texas Medical Branch, Galveston, TX 77555
| | - Roberto P Garofalo
- Institute for Translational Sciences, University of Texas Medical Branch, Galveston, TX 77555.,Sealy Center for Molecular Medicine, University of Texas Medical Branch, Galveston, TX 77555; and.,Department of Pediatrics, University of Texas Medical Branch, Galveston, TX 77555
| | - Allan R Brasier
- Institute for Translational Sciences, University of Texas Medical Branch, Galveston, TX 77555; .,Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555.,Sealy Center for Molecular Medicine, University of Texas Medical Branch, Galveston, TX 77555; and
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21
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Yamamoto K, Yamamoto S, Ogasawara N, Takano K, Shiraishi T, Sato T, Miyata R, Kakuki T, Kamekura R, Kojima T, Tsutsumi H, Himi T, Yokota SI. Clarithromycin prevents human respiratory syncytial virus-induced airway epithelial responses by modulating activation of interferon regulatory factor-3. Pharmacol Res 2016; 111:804-814. [PMID: 27468646 DOI: 10.1016/j.phrs.2016.07.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 07/23/2016] [Accepted: 07/24/2016] [Indexed: 12/31/2022]
Abstract
Macrolide antibiotics exert immunomodulatory activity by reducing pro-inflammatory cytokine production by airway epithelial cells, fibroblasts, vascular endothelial cells, and immune cells. However, the underlying mechanism of action remains unclear. Here, we examined the effect of clarithromycin (CAM) on pro-inflammatory cytokine production, including interferons (IFNs), by primary human nasal epithelial cells and lung epithelial cell lines (A549 and BEAS-2B cells) after stimulation by Toll-like receptor (TLR) and RIG-I-like receptor (RLR) agonists and after infection by human respiratory syncytial virus (RSV). CAM treatment led to a significant reduction in poly I:C- and RSV-mediated IL-8, CCL5, IFN-β and -λ production. Furthermore, IFN-β promoter activity (activated by poly I:C and RSV infection) was significantly reduced after treatment with CAM. CAM also inhibited IRF-3 dimerization and subsequent translocation to the nucleus. We conclude that CAM acts a crucial modulator of the innate immune response, particularly IFN production, by modulating IRF-3 dimerization and subsequent translocation to the nucleus of airway epithelial cells. This newly identified immunomodulatory action of CAM will facilitate the discovery of new macrolides with an anti-inflammatory role.
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Affiliation(s)
- Keisuke Yamamoto
- Department of Otorhinolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Soh Yamamoto
- Department of Microbiology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Noriko Ogasawara
- Department of Otorhinolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan; Department of Microbiology, Sapporo Medical University School of Medicine, Sapporo, Japan.
| | - Kenichi Takano
- Department of Otorhinolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Tsukasa Shiraishi
- Department of Microbiology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Toyotaka Sato
- Department of Microbiology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Ryo Miyata
- Department of Otorhinolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Takuya Kakuki
- Department of Otorhinolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Ryuta Kamekura
- Department of Otorhinolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Takashi Kojima
- Department of Cell Science, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Hiroyuki Tsutsumi
- Department of Pediatrics, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Tetsuo Himi
- Department of Otorhinolaryngology, Sapporo Medical University School of Medicine, Sapporo, Japan
| | - Shin-Ichi Yokota
- Department of Microbiology, Sapporo Medical University School of Medicine, Sapporo, Japan
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22
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Hasegawa K, Dumas O, Hartert TV, Camargo CA. Advancing our understanding of infant bronchiolitis through phenotyping and endotyping: clinical and molecular approaches. Expert Rev Respir Med 2016; 10:891-9. [PMID: 27192374 DOI: 10.1080/17476348.2016.1190647] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
INTRODUCTION Bronchiolitis is a major public health problem worldwide. However, no effective treatment strategies are available, other than supportive care. AREAS COVERED Although bronchiolitis has been considered a single disease diagnosed based on clinical characteristics, emerging evidence supports both clinical and pathobiological heterogeneity. The characterization of this heterogeneity supports the concept that bronchiolitis consists of multiple phenotypes or consistent grouping of characteristics. Expert commentary: Using unbiased statistical approaches, multidimentional clinical characteristics will derive bronchiolitis phenotypes. Furthermore, molecular and systems biology approaches will, by linking pathobiology to phenotype, identify endotypes. Large cohort studies of bronchiolitis with comprehensive clinical characterization and system-wide profiling of the '-omics' data (e.g., host genome, transcriptome, epigenome, viral genome, microbiome, metabolome) should enhance our ability to molecularly understand these phenotypes and lead to more targeted and personalized approaches to bronchiolitis treatment.
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Affiliation(s)
- Kohei Hasegawa
- a Department of Emergency Medicine , Massachusetts General Hospital, Harvard Medical School , Boston , MA , USA
| | - Orianne Dumas
- b INSERM U1168, VIMA: Aging and Chronic Diseases, Epidemiological and Public Health Approaches, Univ. Versailles St-Quentin-en-Yvelines , Villejuif , France
| | - Tina V Hartert
- c Center for Asthma & Environmental Health Sciences Research, Department of Medicine, Division of Allergy, Pulmonary and Critical Care Medicine , Vanderbilt University School of Medicine , Nashville , TN , USA
| | - Carlos A Camargo
- a Department of Emergency Medicine , Massachusetts General Hospital, Harvard Medical School , Boston , MA , USA
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Bakre A, Wu W, Hiscox J, Spann K, Teng MN, Tripp RA. Human respiratory syncytial virus non-structural protein NS1 modifies miR-24 expression via transforming growth factor-β. J Gen Virol 2016; 96:3179-3191. [PMID: 26253191 DOI: 10.1099/jgv.0.000261] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Human respiratory syncytial virus (RSV) is a major health challenge in the young and elderly owing to the lack of a safe and effective vaccine and proven antiviral drugs. Understanding the mechanisms by which viral genes and proteins modulate the host response to infection is critical for identifying novel disease intervention strategies. In this study, the RSV non-structural protein NS1 was shown to suppress miR-24 expression during infection. Lack of NS1 was linked to increased expression of miR-24, whilst NS1 overexpression suppressed miR-24 expression. NS1 was found to induce Kruppel-like factor 6 (KLF6), a transcription factor that positively regulates the transforming growth factor (TGF)-b pathway to induce cell cycle arrest. Silencing of KLF6 led to increased miR-24 expression via downregulation of TGF-β. Treatment with exogenous TGF-β suppressed miR-24 expression and induced KLF6. Confocal microscopy showed co-localization of KLF6 and RSV NS1. These findings indicated that RSV NS1 interacts with KLF6 and modulates miR-24 expression and TGF-β, which facilitates RSV replication.
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Affiliation(s)
- Abhijeet Bakre
- Department of Infectious Diseases, University of Georgia, Athens, GA, USA
| | - Weining Wu
- Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | - Julian Hiscox
- Institute of Infection and Global Health, University of Liverpool, Liverpool, UK
| | - Kirsten Spann
- School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Michael N Teng
- Division of Allergy and Immunology, Department of Internal Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Ralph A Tripp
- Department of Infectious Diseases, University of Georgia, Athens, GA, USA
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24
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Dignan FL, Clark A, Aitken C, Gilleece M, Jayakar V, Krishnamurthy P, Pagliuca A, Potter MN, Shaw B, Skinner R, Turner A, Wynn RF, Coyle P. BCSH/BSBMT/UK clinical virology network guideline: diagnosis and management of common respiratory viral infections in patients undergoing treatment for haematological malignancies or stem cell transplantation. Br J Haematol 2016; 173:380-93. [PMID: 27060988 PMCID: PMC7161808 DOI: 10.1111/bjh.14027] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Revised: 12/30/2015] [Accepted: 01/03/2016] [Indexed: 12/21/2022]
Abstract
A joint working group established by the Haemato-oncology subgroup of the British Committee for Standards in Haematology, the British Society for Bone Marrow Transplantation and the UK Clinical Virology Network has reviewed the available literature and made recommendations for the diagnosis and management of respiratory viral infections in patients with haematological malignancies or those undergoing haematopoietic stem cell transplantation. This guideline includes recommendations for the diagnosis, prevention and treatment of respiratory viral infections in adults and children. The suggestions and recommendations are primarily intended for physicians practising in the United Kingdom.
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Affiliation(s)
- Fiona L Dignan
- Department of Haematology, Central Manchester NHS Foundation Trust, Manchester, UK
| | - Andrew Clark
- Bone Marrow Transplant Unit, Beatson Oncology Centre, Gartnavel Hospital, Glasgow, UK
| | - Celia Aitken
- West of Scotland Specialist Virology Centre, Glasgow Royal Infirmary, Glasgow, UK
| | - Maria Gilleece
- Department of Haematology, Leeds Teaching Hospitals Trust, Leeds, UK
| | - Vishal Jayakar
- Department of Haematology, Kingston Hospital NHS Trust, Kingston upon Thames, London, UK
| | | | - Antonio Pagliuca
- Department of Haematological Medicine, King's College Hospital, London, UK
| | - Michael N Potter
- Section of Haemato-oncology, The Royal Marsden NHS Foundation Trust, London, UK
| | - Bronwen Shaw
- Section of Haemato-oncology, The Royal Marsden NHS Foundation Trust, London, UK
| | - Roderick Skinner
- Department of Paediatric and Adolescent Haematology/Oncology, Great North Children's Hospital, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle, UK
| | - Andrew Turner
- Department of Virology, Central Manchester NHS Foundation Trust, Manchester, UK
| | - Robert F Wynn
- Royal Manchester Children's Hospital, Manchester, UK
| | - Peter Coyle
- Regional Virus Laboratory, Department of Microbiology, Belfast Health and Social Care Trust, Belfast, UK
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Abstract
BACKGROUND Viruses are commonly detected in children with acute respiratory illnesses (ARIs) and in asymptomatic children. Longitudinal studies of viral detections during asymptomatic periods surrounding ARI could facilitate interpretation of viral detections but are currently scant. METHODS We used reverse transcription polymerase chain reaction to analyze respiratory samples from young Andean children for viruses during asymptomatic periods within 8-120 days of index ARI (cough or fever). We compared viral detections over time within children and explored reverse transcription polymerase chain reaction cycle thresholds (CTs) as surrogates for viral loads. RESULTS At least 1 respiratory virus was detected in 367 (43%) of 859 samples collected during asymptomatic periods, with more frequent detections in periods with rhinorrhea (49%) than those without (34%, P < 0.001). Relative to index ARI with human rhinovirus (HRV), adenovirus (AdV), respiratory syncytial virus (RSV) and parainfluenza virus detected, the same viruses were also detected during 32, 22, 10 and 3% of asymptomatic periods, respectively. RSV was only detected 8-30 days after index RSV ARI, whereas HRV and AdV were detected throughout asymptomatic periods. Human metapneumovirus and influenza were rarely detected during asymptomatic periods (<3%). No significant differences were observed in the CT for HRV or AdV during asymptomatic periods relative to ARI. For RSV, CTs were significantly lower during ARI relative to the asymptomatic period (P = 0.03). CONCLUSIONS These findings indicate that influenza, human metapneumovirus, parainfluenza virus and RSV detections in children with an ARI usually indicate a causal relationship. When HRV or AdV is detected during ARI, the causal relationship is less certain.
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27
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Bont L, Baraldi E, Fauroux B, Greenough A, Heikkinen T, Manzoni P, Martinón-Torres F, Nair H, Papadopoulos NG. RSV--still more questions than answers. Pediatr Infect Dis J 2014; 33:1177-9. [PMID: 25162928 DOI: 10.1097/inf.0000000000000535] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Louis Bont
- From the *Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands; †Women's and Children's Health Department, Unit of Respiratory Medicine and Allergy, Padova, Italy; ‡Necker Pediatric University Hospital, Paris Descartes University, Paris, France; §Division of Asthma, Allergy and Lung Biology, King's College, London, United Kingdom; ¶Department of Paediatrics, University of Turku and Turku University Hospital, Turku, Finland; ‖S. Anna Hospital, Neonatal Intensive Care Unit, Torino, Italy; **Hospital Clínico Universitario de Santiago de Compostela, University of Santiago, La Coruña, Spain; ††Center for Population, Health Sciences, The University of Edinburgh, Medical School, Midlothian, United Kingdom; ‡‡Public Health Foundation of India, New Delhi, India; §§Manchester Children's Hospital, Manchester, United Kingdom; and ¶¶Pediatric Clinic, University of Athens, Athens, Greece
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28
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Cai XY, Wang Q, Lin GY, Cai ZW, Lin CX, Chen PZ, Zhou XH, Xie JC, Lu XD. Respiratory virus infections among children in South China. J Med Virol 2014; 86:1249-55. [PMID: 24619492 DOI: 10.1002/jmv.23931] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/21/2014] [Indexed: 02/05/2023]
Abstract
Acute respiratory tract infection is an important cause of morbidity and mortality with a worldwide disease burden. This study aimed to determine the prevalence and clinical characteristics of children with viral-induced acute respiratory tract infection, in Southern China. Nasopharyngeal aspirate samples from 1,980 pediatric patients with suspected acute respiratory tract infection, and 82 samples from healthy subject controls were collected for routine examination at the Second Affiliated Hospital of Shantou University Medical College, from October 2007 to August 2011. Specimens were tested by multiplex polymerase chain reaction (mPCR). At least one or more viruses were detected from 1,087 samples (54.9%). These included laboratory confirmations for 446 respiratory syncytial virus (RSV), 386 influenza virus A (FluA), 315 human rhinovirus (HRV), 135 human bocavirus (HBoV), 119 Parainfluenza virus 3 (PIV3), 82 Parainfluenza virus 1 (PIV1), 66 adenovirus (ADV), 53 WU polyomavirus (WUPyV), 52 human metapneumovirus (hMPV), and 29 influenza virus B (FluB) samples. Samples from healthy subjects were negative for any virus. Of the patients with positive specimens, 107 (9.8%) were admitted to pediatric intensive care unit (PICU). Co-infection with at least two of the viral pathogens under study was observed in 325 of the 1,980 patients (16.4% of the total number of cases). These findings may help in the diagnosis of viral infections of the respiratory tract in children, and help to consider current and potential therapeutic approaches for the treatment of acute respiratory tract infection, and further respiratory complications.
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Affiliation(s)
- Xiao-Ying Cai
- Department of Pediatrics, The Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China
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