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  1. Article ; Online: Epidemiologic, clinical, and genetic characteristics of influenza C virus infections among outpatients and inpatients in Sendai, Japan from 2006 to 2020.

    Matsuzaki, Yoko / Ohmiya, Suguru / Ota, Reiko / Kitai, Yuki / Watanabe, Oshi / Kitaoka, Setsuko / Kumaki, Satoru / Onuma, Ryoichi / Watanabe, Yohei / Nagai, Yukio / Kadowaki, Yoko / Shimotai, Yoshitaka / Nishimura, Hidekazu

    Journal of clinical virology : the official publication of the Pan American Society for Clinical Virology

    2023  Volume 162, Page(s) 105429

    Abstract: Background: Influenza C virus is a pathogen that causes acute respiratory illness in children ... to influenza A or B viruses.: Methods: A total of 60 influenza C viruses were isolated by clinical tests ... The clinical information about this virus is limited because of the small number of isolated viruses compared ...

    Abstract Background: Influenza C virus is a pathogen that causes acute respiratory illness in children. The clinical information about this virus is limited because of the small number of isolated viruses compared to influenza A or B viruses.
    Methods: A total of 60 influenza C viruses were isolated by clinical tests using cell culture methods conducted in one hospital and one clinic during the 15 years from 2006 to 2020. These 60 cases were retrospectively analyzed by comparing outpatients and inpatients. Moreover, isolated viruses were analyzed for genomic changes during the study period.
    Results: All were younger than 7 years, and 73% of inpatients (19 out of 26) were under 2 years of age. A significant difference was found in the frequency of pneumonia, accounting for 45% and 4% of inpatients and outpatients, respectively. Most of the viruses isolated from 2006 to 2012 belonged to the S/A sublineage of the C/Sao Paulo lineage, but three sublineage viruses, including the S/A sublineage with K190N mutation, S/V sublineage, and C/Kanagawa lineage, have cocirculated since 2014. Moreover, S/A sublineage viruses were undergoing reassortment since 2014, suggesting significant changes in the virus, both antigenically and genetically. Of the 10 strains from patients with pneumonia, 7 were in the S/A sublineage, which had circulated from 2006 to 2012.
    Conclusion: Infants under 2 years of age were more likely to be hospitalized with pneumonia. The genomic changes that occurred in 2014 were suggested to affect the ability of the virus to spread.
    MeSH term(s) Infant ; Child ; Humans ; Gammainfluenzavirus/genetics ; Outpatients ; Inpatients ; Japan/epidemiology ; Retrospective Studies ; Brazil ; Influenza, Human/epidemiology
    Language English
    Publishing date 2023-04-04
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1446080-4
    ISSN 1873-5967 ; 1386-6532
    ISSN (online) 1873-5967
    ISSN 1386-6532
    DOI 10.1016/j.jcv.2023.105429
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Epidemiology and Clinical Characteristics of Influenza C Virus.

    Sederdahl, Bethany K / Williams, John V

    Viruses

    2020  Volume 12, Issue 1

    Abstract: Influenza C virus (ICV) is a common yet under-recognized cause of acute respiratory illness. ICV ... clinical characteristics of ICV. ...

    Abstract Influenza C virus (ICV) is a common yet under-recognized cause of acute respiratory illness. ICV seropositivity has been found to be as high as 90% by 7-10 years of age, suggesting that most people are exposed to ICV at least once during childhood. Due to difficulty detecting ICV by cell culture, epidemiologic studies of ICV likely have underestimated the burden of ICV infection and disease. Recent development of highly sensitive RT-PCR has facilitated epidemiologic studies that provide further insights into the prevalence, seasonality, and course of ICV infection. In this review, we summarize the epidemiology and clinical characteristics of ICV.
    MeSH term(s) Child ; Humans ; Influenza, Human/epidemiology ; Influenza, Human/virology ; Gammainfluenzavirus/genetics ; Gammainfluenzavirus/pathogenicity ; Respiratory System/virology ; Seroepidemiologic Studies
    Keywords covid19
    Language English
    Publishing date 2020-01-13
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, P.H.S. ; Review
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v12010089
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: [Molecular-related epidemic characteristics of influenza A (H3N2) viruses in Guangzhou, 2019].

    Cao, L / Wu, D / Chen, Y Y / Zeng, Q / Xia, D / Liu, Y H / Lu, J Y / Li, K B / Di, B / Zhang, Z B

    Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi

    2021  Volume 42, Issue 5, Page(s) 891–897

    Abstract: Objective: ...

    Abstract Objective:
    MeSH term(s) Adolescent ; Child ; China/epidemiology ; Epidemics ; Female ; Hemagglutinin Glycoproteins, Influenza Virus/genetics ; Humans ; Influenza A Virus, H3N2 Subtype/genetics ; Influenza, Human/epidemiology ; Male ; Neuraminidase/genetics ; Phylogeny ; Young Adult
    Chemical Substances Hemagglutinin Glycoproteins, Influenza Virus ; Neuraminidase (EC 3.2.1.18)
    Language Chinese
    Publishing date 2021-11-23
    Publishing country China
    Document type Journal Article
    ZDB-ID 645026-x
    ISSN 0254-6450
    ISSN 0254-6450
    DOI 10.3760/cma.j.cn1112338-20200724-00983
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Epidemiology of influenza virus reinfection in Guangxi, China: a retrospective analysis of a nine-year influenza surveillance data: Characteristics of influenza virus reinfection.

    Wang, Jing / Jiang, Lina / Xu, Yunan / He, Weitao / Zhang, Chao / Bi, Fuyin / Tan, Yi / Ning, Chuanyi

    International journal of infectious diseases : IJID : official publication of the International Society for Infectious Diseases

    2022  Volume 120, Page(s) 135–141

    Abstract: ... not been well described.: Methods: This study included all influenza cases of Guangxi, China ... were independent risk factors associated with influenza reinfection. Among 49 patients experiencing two ... Background: Epidemiological characteristic profile of the reinfection of the influenza virus has ...

    Abstract Background: Epidemiological characteristic profile of the reinfection of the influenza virus has not been well described.
    Methods: This study included all influenza cases of Guangxi, China from January 2011-December 2019 that were recorded in the National Notifiable Infectious Disease Reporting Information System (NIDRIS) within 24 hours after diagnosis.
    Results: A total of 53,605.6 person-months and the median time of 8.7 months were observed for reinfection. The median age at the first influenza virus infection was 4.5 (interquartile range=2.0-7.5) years. The cumulative reinfection incidence was 2% at 6 months, 4% at 12 months, 5% at 24 months, and 7% after 59 months. Living in the rural area (hazard ratio [HR]=1.37 [95% confidence interval (CI), 1.29-1.45]), age ≤6 years (HR=11.43 [95% CI, 9.47-13.80]) were independent risk factors associated with influenza reinfection. Among 49 patients experiencing two laboratory tests, 32 patients (65.3%) were found to be infected with different virus types. The interval between two consecutive laboratory-confirmed episodes of the four groups differed (p=0.148): the maximum was 72.9 months and the minimum was 1.2 months.
    Conclusions: The reinfection of the influenza virus in Guangxi was independently and positively associated with living the rural area and younger age. The unusually high frequency of reinfection points to a need for further prospective longitudinal studies to better investigate the sufficient impact on different subtypes.
    MeSH term(s) Child ; China/epidemiology ; Humans ; Influenza, Human/epidemiology ; Orthomyxoviridae ; Reinfection ; Retrospective Studies
    Language English
    Publishing date 2022-04-25
    Publishing country Canada
    Document type Journal Article
    ZDB-ID 1331197-9
    ISSN 1878-3511 ; 1201-9712
    ISSN (online) 1878-3511
    ISSN 1201-9712
    DOI 10.1016/j.ijid.2022.04.045
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Epidemiology and clinical characteristics of influenza C virus

    Sederdahl, B. K. / Williams, J. V.

    Viruses

    Abstract: Influenza C virus (ICV) is a common yet under-recognized cause of acute respiratory illness ICV ... clinical characteristics of ICV Copyright © 2020 by the authors ...

    Abstract Influenza C virus (ICV) is a common yet under-recognized cause of acute respiratory illness ICV seropositivity has been found to be as high as 90% by 7-10 years of age, suggesting that most people are exposed to ICV at least once during childhood Due to difficulty detecting ICV by cell culture, epidemiologic studies of ICV likely have underestimated the burden of ICV infection and disease Recent development of highly sensitive RT-PCR has facilitated epidemiologic studies that provide further insights into the prevalence, seasonality, and course of ICV infection In this review, we summarize the epidemiology and clinical characteristics of ICV Copyright © 2020 by the authors
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #831190
    Database COVID19

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  6. Article: Epidemiology and Clinical Characteristics of Influenza C Virus

    Sederdahl, Bethany K / Williams, John V

    Viruses. 2020 Jan. 13, v. 12, no. 1

    2020  

    Abstract: Influenza C virus (ICV) is a common yet under-recognized cause of acute respiratory illness. ICV ... clinical characteristics of ICV. ...

    Abstract Influenza C virus (ICV) is a common yet under-recognized cause of acute respiratory illness. ICV seropositivity has been found to be as high as 90% by 7–10 years of age, suggesting that most people are exposed to ICV at least once during childhood. Due to difficulty detecting ICV by cell culture, epidemiologic studies of ICV likely have underestimated the burden of ICV infection and disease. Recent development of highly sensitive RT-PCR has facilitated epidemiologic studies that provide further insights into the prevalence, seasonality, and course of ICV infection. In this review, we summarize the epidemiology and clinical characteristics of ICV.
    Keywords Influenza C virus ; cell culture ; childhood ; epidemiological studies ; people ; respiratory tract diseases ; reverse transcriptase polymerase chain reaction ; seroprevalence
    Language English
    Dates of publication 2020-0113
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2516098-9
    ISSN 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v12010089
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: [GENETIC CHARACTERISTICS OF INFLUENZA A/H3N2 AND B VIRUSES THAT HAD CIRCULATED IN RUSSIA IN 2013 - 2015].

    Yatsyshina, S B / Renteeva, A N / Valdokhina, A V / Elkina, M A / Speranskaya, A S / Pimkina, E V / Mintaev, R R / Markelov, M L / Maleev, V V

    Zhurnal mikrobiologii, epidemiologii i immunobiologii

    2019  , Issue 5, Page(s) 60–72

    Abstract: ... predominated among the studied influenza B viruses, only 1 virus of 2014 - 2015 belonged to Victoria lineage, 1 ... of molecular markers of resistance to etiotropic preparations against influenza A/H3N2 and B viruses that had ... 5. programs.: Results: In 2013 -2014 A/Texas/50/2012-like-clade 3C.3 influenza A/H3N2 viruses ...

    Abstract Aim: Establish genetic characteristics, carry out phylogenetic analysis and determination of molecular markers of resistance to etiotropic preparations against influenza A/H3N2 and B viruses that had circulated in Russia in 2013 - 2015.
    Materials and methods: 80 biological samples containing influenza A/H3N2 virus RNA and 31 samples containing influenza B virus RNA were studied. Sequencing of PCR fragments was carried out inABI-3 100 PRIZMTM GeneticAnalyzer (AppliedBiosystems, USA) and using MiSeq (Illumina, USA). Data treatment and analysis was carried out using CLC v.3.6.5., DNASTAR and BioNumerics v.6.5. programs.
    Results: In 2013 -2014 A/Texas/50/2012-like-clade 3C.3 influenza A/H3N2 viruses dominated, 10% belonged to subclade 3C.2a and 10% - to 3C.3b. Most of the viruses (8 1%) of 2014 - 2015 were of 3C.2a clade, the portion of viruses belonging to 3C.3b and 3C.3a was 9 and 10%. Yamagata-like viruses predominated among the studied influenza B viruses, only 1 virus of 2014 - 2015 belonged to Victoria lineage, 1 reassortant of Yamagata and Victoria lineages was detected. Rimantadine- resistance mutationS3 lN(M2 protein) was detected in all the influenza A/H3N2 viruses. Mutations determining resistance to oseltamivir (NA gene) were not detected in influenza A/H3N2 and B viruses.
    Conclusion: Increase of influenza morbidity in 2014 - 2015 was determined by the emergence of influenza A/H3N2 and B viruses, antigenically distinct from those that had circulated previously and those included into the vaccine, thus resulting in the WHO decision to change A/ H3N2 and B components of the 2015 - 2016 vaccine: Simultaneous circulation of 2 lineages of influenza B virus and emergence of their reassortants gives evidence on the necessity of use of quadrivalent vaccines, containing both lineages.
    MeSH term(s) Humans ; Influenza A Virus, H3N2 Subtype/genetics ; Influenza A Virus, H3N2 Subtype/isolation & purification ; Influenza B virus/genetics ; Influenza B virus/isolation & purification ; Influenza Vaccines/genetics ; Influenza, Human/epidemiology ; Influenza, Human/genetics ; Influenza, Human/prevention & control ; Mutation ; Russia/epidemiology
    Chemical Substances Influenza Vaccines
    Language Russian
    Publishing date 2019-03-10
    Publishing country Russia (Federation)
    Document type Journal Article
    ZDB-ID 218354-7
    ISSN 0372-9311 ; 0049-8726 ; 0372-8714
    ISSN 0372-9311 ; 0049-8726 ; 0372-8714
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Clinical and epidemiological characteristics of influenza virus infection in hospitalized children with acute respiratory infections in Sri Lanka.

    Rafeek, Rukshan A M / Divarathna, Maduja V M / Morel, Adrian J / Noordeen, Faseeha

    PloS one

    2022  Volume 17, Issue 9, Page(s) e0272415

    Abstract: ... From May 2016 to June 2018, NPAs were tested for influenza A (Inf-A) and B (Inf-B) viruses, human ... Influenza viruses (Inf-V) are an important cause of acute respiratory infection (ARI) in children ... of the circulating virus. ...

    Abstract Influenza viruses (Inf-V) are an important cause of acute respiratory infection (ARI) in children. This study was undertaken to describe the clinical and epidemiological characteristics of Inf-V infections in a sample of hospitalized children with ARI. Nasopharyngeal aspirates (NPA) from 500 children between 1 month to 5 years old with symptoms of ARI were collected at the Teaching Hospital Kegalle Sri Lanka From May 2016 to June 2018, NPAs were tested for influenza A (Inf-A) and B (Inf-B) viruses, human respiratory syncytial virus (hRSV), human parainfluenza virus (hPIV) 1-3 using an immunofluorescence assay. The Inf-V were then subtyped using a multiplex RT-PCR. Inf-V were detected in 10.75% (54/502) of the hospitalized children with ARI and in that 5.57% (28/502) were positive for Inf-A and 5.17% (26/502) were positive for Inf-B. Of the 54 Inf-V positive children, 33 were aged between 6 and 20 months. Of the 28 children infected with Inf-A, 15 had uncharacterized lower respiratory infection, 7 had bronchopneumonia and 6 had bronchiolitis. Of the 26 children infected with Inf-B, 11 had uncharacterized lower respiratory infection, 10 had bronchiolitis, and 4 had bronchopneumonia. Inf-B circulated throughout the year with a few peaks, one in June and then in August followed by November to December in 2016 and one in April 2017 and January 2018. Inf-A circulated throughout the year with a major peak in March to April 2017 and July 2018. ARI was more common in boys compared to girls. Majority of the children infected with Inf-V were diagnosed with uncharacterized lower respiratory infection and mild to moderate bronchiolitis. Inf-V infections were prevalent throughout the year in the study area of Sri Lanka with variations in the type of the circulating virus.
    MeSH term(s) Bronchopneumonia ; Child ; Child, Hospitalized ; Communicable Diseases ; Female ; Humans ; Infant ; Influenza, Human/epidemiology ; Male ; Orthomyxoviridae ; Respiratory Syncytial Virus Infections/epidemiology ; Respiratory Tract Infections/epidemiology ; Sri Lanka/epidemiology ; Viruses
    Language English
    Publishing date 2022-09-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0272415
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Epidemiological and genetic characteristics of influenza virus and the effects of air pollution on laboratory-confirmed influenza cases in Hulunbuir, China, from 2010 to 2019.

    Lu, Bing / Wang, Yingchen / Zhu, Zhansong / Zhang, Zhe / Dong, Tuo / Li, Falong / Gao, Ya / Du, Xiqiao / Qu, Zhangyi

    Epidemiology and infection

    2020  Volume 148, Page(s) e159

    Abstract: Objective: A continuous survey on influenza was conducted in Hulunbuir, China from January 2010 ... influenza cases.: Methods: Influenza-like illness and severe acute respiratory infection subjects were ... investigation. The association between air pollutants and influenza-positivity rate was assessed ...

    Abstract Objective: A continuous survey on influenza was conducted in Hulunbuir, China from January 2010 to May 2019 to reveal epidemiological, microbiological and air pollutants associated with laboratory-confirmed influenza cases.
    Methods: Influenza-like illness and severe acute respiratory infection subjects were enrolled from a sentinel hospital in Hulunbuir during the study period for epidemiological and virological investigation. The association between air pollutants and influenza-positivity rate was assessed by a generalised additive model.
    Results: Of 4667 specimens, 550 (11.8%) were tested positive for influenza. The influenza-positivity was highest in the age groups of 5-14 years, 50-69 years and ⩾70 years. We found that the effect of particulate matter ⩽2.5 μm (PM2.5) concentrations on the influenza-positivity rate was statistically significant, particularly on day lag-4 and lag-5. Genetic characterisations showed that (H1N1) pdm09 strains belonged to subclade 6B.1 and that influenza B isolates belonged to subclade 1A-3Del, with significant substitutions in the haemagglutinin and neuraminidase proteins compared with those in the WHO-recommended vaccine strains.
    Conclusions: Elderly individuals and school-age children were at high risk for influenza infection. PM2.5 concentrations showed significant effects on influenza-positivity rate in Hulunbuir, which could be considered in local influenza prevention strategies.
    MeSH term(s) Adolescent ; Adult ; Aged ; Air Pollution/adverse effects ; Child ; Child, Preschool ; China/epidemiology ; Female ; Humans ; Influenza A Virus, H1N1 Subtype/genetics ; Influenza, Human/epidemiology ; Influenza, Human/virology ; Male ; Middle Aged ; Young Adult
    Language English
    Publishing date 2020-06-29
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 632982-2
    ISSN 1469-4409 ; 0950-2688
    ISSN (online) 1469-4409
    ISSN 0950-2688
    DOI 10.1017/S0950268820001387
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Molecular genetic characteristics of influenza A virus clinically isolated during 2011-2016 influenza seasons in Korea.

    Lee, Han Sol / Noh, Ji Yun / Song, Joon Young / Cheong, Hee Jin / Choi, Won Suk / Jeong, Hye Won / Wie, Seong-Heon / Kim, Woo Joo

    Influenza and other respiratory viruses

    2018  Volume 12, Issue 4, Page(s) 497–507

    Abstract: ... 3696, influenza B; n = 928, co-infection; n = 101). We used 254 viral sequences from the 3696 influenza ... enrolled in the Hospital-based Influenza Morbidity & Mortality surveillance system in Korea during 2011 ... 2016. Among these cases, a total of 4725 were diagnosed with influenza using RT-PCR (influenza A; n ...

    Abstract Background: The influenza virus is reportedly associated with 3-5 million cases of severe illness and 250 000-500 000 deaths annually worldwide.
    Objectives: We investigated the variation of influenza A virus in Korea and examined the association with death.
    Methods: A total of 13 620 cases were enrolled in the Hospital-based Influenza Morbidity & Mortality surveillance system in Korea during 2011-2016. Among these cases, a total of 4725 were diagnosed with influenza using RT-PCR (influenza A; n = 3696, influenza B; n = 928, co-infection; n = 101). We used 254 viral sequences from the 3696 influenza A cases for phylogenetic analysis using the BioEdit and MEGA 6.06 programs.
    Results: We found that the sequences of A/H3N2 in the 2011-2012 season belong to subgroup 3C.1, whereas the sequences in the 2012-2013 season pertain to subgroup 3C.2. The sequences in the 2013-2014 and 2014-2015 seasons involve subgroups 3C.3a and 3C.2a. The A/H1N1pdm09 subtype belongs to subgroup 6 and contains two clusters. In addition, sequence analysis confirmed the several substitutions of internal genes and gene substitutions associated with drug resistance (I222V in NA and S31N in M2) in the fatal cases. While statistical analysis found no significant associations between genetic differences in the viruses and mortality, mortality was associated with certain host factors, such as chronic lung disease.
    Conclusions: In conclusion, influenza A virus clade changes occurred in Korea during the 2011-2016 seasons. These data, along with antigenic analysis, can aid in selecting effective vaccine strains. We confirmed that fatality in influenza A cases was related to underlying patient diseases, such as chronic lung disease, and further studies are needed to confirm associations between mortality and viral genetic substitutions.
    MeSH term(s) Hemagglutination Inhibition Tests ; Humans ; Influenza A Virus, H1N1 Subtype/genetics ; Influenza A Virus, H3N2 Subtype/genetics ; Influenza, Human/epidemiology ; Influenza, Human/virology ; Phylogeny ; RNA, Viral/genetics ; Republic of Korea/epidemiology ; Seasons ; Time Factors
    Chemical Substances RNA, Viral
    Language English
    Publishing date 2018-03-30
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2274538-5
    ISSN 1750-2659 ; 1750-2640
    ISSN (online) 1750-2659
    ISSN 1750-2640
    DOI 10.1111/irv.12549
    Database MEDical Literature Analysis and Retrieval System OnLINE

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