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  1. Article ; Online: Comparison of Captia

    Wong, Ann H / Ho, Yolanda I I / Tang, Kevin P S / Lai, Raymond W M

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

    2020  Volume 127, Page(s) 104342

    Abstract: Background: Correlation of the assay cut-off values for Captia: Objective: The aim of this study was to compare the relative performance of the Captia: Study design: Correlation of the cut-off value of both assays with the immunoprotective level ... ...

    Abstract Background: Correlation of the assay cut-off values for Captia
    Objective: The aim of this study was to compare the relative performance of the Captia
    Study design: Correlation of the cut-off value of both assays with the immunoprotective level was determined with the 3rd WHO Measles IgG International Standard. One hundred clinical samples including frozen and fresh were tested with both assays. The positive percentage agreement (PPA) based on the manufacturers' interpretation and the WHO recommended immunoprotective level was compared.
    Results: Samples tested positive by the Captia
    Conclusions: Captia
    MeSH term(s) Antibodies, Viral/blood ; Humans ; Immunoassay/methods ; Immunoglobulin G/blood ; Measles/diagnosis ; Measles/immunology ; Measles virus/immunology ; Reagent Kits, Diagnostic ; Sensitivity and Specificity ; World Health Organization
    Chemical Substances Antibodies, Viral ; Immunoglobulin G ; Reagent Kits, Diagnostic
    Language English
    Publishing date 2020-04-06
    Publishing country Netherlands
    Document type Comparative Study ; Journal Article
    ZDB-ID 1446080-4
    ISSN 1873-5967 ; 1386-6532
    ISSN (online) 1873-5967
    ISSN 1386-6532
    DOI 10.1016/j.jcv.2020.104342
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Comparison of the Cepheid Xpert Xpress Flu/RSV Assay to in-house Flu/RSV triplex real-time RT-PCR for rapid molecular detection of Influenza A, Influenza B and Respiratory Syncytial Virus in respiratory specimens.

    Ho, Yolanda I I / Wong, Ann H / Lai, Raymond W M

    Journal of medical microbiology

    2018  Volume 67, Issue 11, Page(s) 1576–1580

    Abstract: This study compared the performance of the commercially available Xpert Xpress Flu/RSV assay to an in-house FluAB/RSV triplex real-time RT-PCR assay for the detection of influenza A/B viruses and respiratory syncitial virus (RSV) from both nasopharyngeal ...

    Abstract This study compared the performance of the commercially available Xpert Xpress Flu/RSV assay to an in-house FluAB/RSV triplex real-time RT-PCR assay for the detection of influenza A/B viruses and respiratory syncitial virus (RSV) from both nasopharyngeal aspirate (NPA) and nasopharyngeal flocked swab (NPS). A total of 20 external quality assurance (EQA) samples and 172 clinical respiratory samples were tested prospectively using both the Xpert Xpress Flu/RSV assay and the in-house FluAB/RSV triplex assay. For the EQA samples, concordance rate was 100 % when tested with both assays. For clinical samples, there was 100 % agreement between the two assays for detection of influenza A and influenza B, 96.7 % agreement for detection of RSV and 99.7 % agreement for negative results. With a shortened turnaround time and good diagnostic performance, application of the Xpert Xpress Flu/RSV assay can facilitate patient triage for prompt implementation of infection control measures and management of high-risk patients during influenza epidemics.
    MeSH term(s) Biological Assay ; DNA Primers/genetics ; Humans ; Influenza A virus/genetics ; Influenza A virus/isolation & purification ; Influenza B virus/genetics ; Influenza B virus/isolation & purification ; Influenza, Human/diagnosis ; Influenza, Human/virology ; Molecular Diagnostic Techniques/instrumentation ; Molecular Diagnostic Techniques/methods ; Multiplex Polymerase Chain Reaction/methods ; Nasopharynx/virology ; Real-Time Polymerase Chain Reaction/instrumentation ; Real-Time Polymerase Chain Reaction/methods ; Respiratory Syncytial Virus Infections/diagnosis ; Respiratory Syncytial Virus Infections/virology ; Respiratory Syncytial Viruses/genetics ; Respiratory Syncytial Viruses/isolation & purification ; Sensitivity and Specificity
    Chemical Substances DNA Primers
    Language English
    Publishing date 2018-09-12
    Publishing country England
    Document type Comparative Study ; Journal Article
    ZDB-ID 218356-0
    ISSN 1473-5644 ; 0022-2615
    ISSN (online) 1473-5644
    ISSN 0022-2615
    DOI 10.1099/jmm.0.000841
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Performance evaluation of the re-standardized Abbott Architect anti-HBs assay.

    Wong, Ann H / Ho, Yolanda I I / Lai, Raymond W M

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

    2018  Volume 111, Page(s) 1–3

    Abstract: Background: As defined by World Health Organization (WHO), an antibody level of ≥ 10mIU/mL to hepatitis B virus confers protection. With the launching of Abbott anti-HBs assay re-standardized to the 2: Objectives: To evaluate the performance of the ... ...

    Abstract Background: As defined by World Health Organization (WHO), an antibody level of ≥ 10mIU/mL to hepatitis B virus confers protection. With the launching of Abbott anti-HBs assay re-standardized to the 2
    Objectives: To evaluate the performance of the re-standardized Abbott Architect anti-HBs assay and to determine the impact of the upward shift.
    Study design: A total of 52 samples, including 12 external quality assurance programme samples and 40 clinical samples were tested with both the Abbott 1
    Results: Verification of the re-standardized assay with the 2
    Conclusions: Final interpretation of immune status to hepatitis B was not affected by the upward shift following introduction of the new Abbott anti-HBs assay except for previously negative samples with anti-HBs levels between >5.00 to <10.00 mIU/mL.
    MeSH term(s) Hepatitis B/diagnosis ; Hepatitis B Antibodies/blood ; Hepatitis B virus/immunology ; Humans ; Reagent Kits, Diagnostic/standards ; Reference Standards ; Serologic Tests/standards ; World Health Organization
    Chemical Substances Hepatitis B Antibodies ; Reagent Kits, Diagnostic
    Language English
    Publishing date 2018-12-15
    Publishing country Netherlands
    Document type Evaluation Study ; Journal Article
    ZDB-ID 1446080-4
    ISSN 1873-5967 ; 1386-6532
    ISSN (online) 1873-5967
    ISSN 1386-6532
    DOI 10.1016/j.jcv.2018.12.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Comparison of three commercial SARS-CoV-2 assays for pooled testing of deep throat saliva for surveillance of patients attending general outpatient clinics.

    Ho, Yolanda I / Wong, Ann H / Tang, Kevin P S / Wong, River C W / Leung, Eddie C M / Lai, Raymond W M

    Journal of medical virology

    2021  Volume 93, Issue 4, Page(s) 1917–1919

    MeSH term(s) COVID-19/diagnosis ; COVID-19 Nucleic Acid Testing ; Humans ; Nasopharynx/virology ; SARS-CoV-2/isolation & purification ; Saliva/virology ; Specimen Handling
    Language English
    Publishing date 2021-01-11
    Publishing country United States
    Document type Comparative Study ; Letter
    ZDB-ID 752392-0
    ISSN 1096-9071 ; 0146-6615
    ISSN (online) 1096-9071
    ISSN 0146-6615
    DOI 10.1002/jmv.26764
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Rapid adaptation and continuous performance evaluation of SARS-CoV-2 envelope gene (E-gene) real-time RT-PCR assays to support the hospital surge in test demand.

    Ho, Yolanda I I / Wong, Ann H / Leung, Eddie C M / Wong, River C W / Lai, Raymond W M

    Journal of medical virology

    2020  Volume 93, Issue 3, Page(s) 1824–1827

    Abstract: We describe the timely adaption of both published WHO E-gene protocol and commercially available LightMix Modular E-gene assay to the test platform (ABI 7900 Fast real-time analyzer and TaqMan Fast One-step Virus Master Mix) available in an accredited ... ...

    Abstract We describe the timely adaption of both published WHO E-gene protocol and commercially available LightMix Modular E-gene assay to the test platform (ABI 7900 Fast real-time analyzer and TaqMan Fast One-step Virus Master Mix) available in an accredited tertiary hospital laboratory with an on-going evaluation to ensure the provision of quality service within the time constraint. The LightMix Modular E-gene was slightly more sensitive when compared to the WHO E-gene, both analytically and diagnostically. The assay was recommended for screening of SARS-CoV-2 infection. With the availability of technically competent staff through continuous training, the provision of round-the-clock service is feasible despite the test is of high complexity. The thermal cycling duration of the adapted LightMix E-gene and WHO E-gene is shortened by half and one hour respectively and allows the number of runs to double when 24-h round-the-clock service is provided. An increase in testing capacity could support surges in testing demand, which is essential to control the current SARS-CoV-2 pandemic, to prevent potential overwhelming of the healthcare system, and to optimize utilization of the isolation beds.
    MeSH term(s) COVID-19/diagnosis ; COVID-19/virology ; COVID-19 Testing/methods ; Clinical Laboratory Techniques/methods ; Coronavirus Envelope Proteins/genetics ; Genes, env/genetics ; Hospitals ; Humans ; Pandemics/prevention & control ; RNA, Viral/genetics ; Real-Time Polymerase Chain Reaction/methods ; Reverse Transcriptase Polymerase Chain Reaction/methods ; SARS-CoV-2/genetics ; Sensitivity and Specificity
    Chemical Substances Coronavirus Envelope Proteins ; RNA, Viral ; envelope protein, SARS-CoV-2
    Keywords covid19
    Language English
    Publishing date 2020-11-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 752392-0
    ISSN 1096-9071 ; 0146-6615
    ISSN (online) 1096-9071
    ISSN 0146-6615
    DOI 10.1002/jmv.26660
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Higher Viral Load of Emerging Norovirus GII.P16-GII.2 than Pandemic GII.4 and Epidemic GII.17, Hong Kong, China.

    Cheung, Sarah K C / Kwok, Kirsty / Zhang, Lin-Yao / Mohammad, Kirran N / Lui, Grace C Y / Lee, Nelson / Nelson, E Anthony S / Lai, Raymond W M / Leung, Ting F / Chan, Paul K S / Chan, Martin Chi-Wai

    Emerging infectious diseases

    2019  Volume 25, Issue 1, Page(s) 119–122

    Abstract: We compared viral load of emerging recombinant norovirus GII.P16-GII.2 with those for pandemic GII.Pe-GII.4 and epidemic GII.P17-GII.17 genotypes among inpatients in Hong Kong. Viral load of GII.P16-GII.2 was higher than those for other genotypes in ... ...

    Abstract We compared viral load of emerging recombinant norovirus GII.P16-GII.2 with those for pandemic GII.Pe-GII.4 and epidemic GII.P17-GII.17 genotypes among inpatients in Hong Kong. Viral load of GII.P16-GII.2 was higher than those for other genotypes in different age groups. GII.P16-GII.2 is as replication competent as the pandemic genotype, explaining its high transmissibility and widespread circulation.
    MeSH term(s) Adolescent ; Adult ; Caliciviridae Infections/epidemiology ; Caliciviridae Infections/virology ; Child ; Child, Preschool ; Communicable Diseases, Emerging/epidemiology ; Communicable Diseases, Emerging/virology ; Female ; Gastroenteritis/epidemiology ; Gastroenteritis/virology ; Genotype ; Hong Kong/epidemiology ; Humans ; Infant ; Male ; Middle Aged ; Norovirus/genetics ; Pandemics ; Viral Load ; Young Adult
    Language English
    Publishing date 2019-02-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1380686-5
    ISSN 1080-6059 ; 1080-6040
    ISSN (online) 1080-6059
    ISSN 1080-6040
    DOI 10.3201/eid2501.180395
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Bimodal Seasonality and Alternating Predominance of Norovirus GII.4 and Non-GII.4, Hong Kong, China, 2014-2017

    Chan, Martin Chi-Wai / Kwok, Kirsty / Zhang, Lin-Yao / Mohammad, Kirran N / Lee, Nelson / Lui, Grace C Y / Nelson, E Anthony S / Lai, Raymond W M / Leung, Ting F / Chan, Paul K S

    Emerging infectious diseases

    2018  Volume 24, Issue 4

    Abstract: We report emerging subtropical bimodal seasonality and alternating predominance of norovirus GII.4 and non-GII.4 genotypes in Hong Kong. GII.4 predominated in summer and autumn months and affected young children, whereas emergent non-GII.4 genotypes ... ...

    Abstract We report emerging subtropical bimodal seasonality and alternating predominance of norovirus GII.4 and non-GII.4 genotypes in Hong Kong. GII.4 predominated in summer and autumn months and affected young children, whereas emergent non-GII.4 genotypes predominated in winter months and affected all age groups. This highly dynamic epidemiology should inform vaccination strategies.
    Language English
    Publishing date 2018-04-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1380686-5
    ISSN 1080-6059 ; 1080-6040
    ISSN (online) 1080-6059
    ISSN 1080-6040
    DOI 10.3201/eid2404.171791
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Surveillance of antibiotic resistance among common Clostridium difficile ribotypes in Hong Kong.

    Chow, Viola C Y / Kwong, Thomas N Y / So, Erica W M / Ho, Yolanda I I / Wong, Sunny H / Lai, Raymond W M / Chan, Raphael C Y

    Scientific reports

    2017  Volume 7, Issue 1, Page(s) 17218

    Abstract: Incidence of Clostridium difficile infection (CDI) is rapidly increasing and it poses a major health burden globally. However, data regarding the epidemiology of CDI in Asia are limited. We aimed to characterize the antimicrobial susceptibility patterns ... ...

    Abstract Incidence of Clostridium difficile infection (CDI) is rapidly increasing and it poses a major health burden globally. However, data regarding the epidemiology of CDI in Asia are limited. We aimed to characterize the antimicrobial susceptibility patterns of common ribotypes of toxigenic C. difficile in Hong Kong. Fifty-three PCR ribotypes were identified among 284 toxigenic C. difficile clinical isolates. The five most prevalent ribotypes were 002 (13%), 017 (12%), 014 (10%), 012 (9.2%), and 020 (9.5%). All tested C. difficile strains remained susceptible to metronidazole, vancomycin, meropenem and piperacillin/tazobactam, but highly resistant to cephalosporins. Of the fluoroquinolones, highest resistance to ciprofloxacin was observed (99%), followed by levofloxacin (43%) and moxifloxacin (23%). The two newly emerged PCR ribotypes, 017 and 002, demonstrated high levels of co-resistance towards clindamycin, tetracycline, erythromycin and moxifloxacin. PCR ribotypes 017 and 002 with multi-drug resistance are rapidly emerging and continuous surveillance is important to monitor the epidemiology of C. difficile to prevent outbreaks of CDI.
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Clostridium difficile/classification ; Clostridium difficile/drug effects ; Clostridium difficile/genetics ; Drug Resistance, Bacterial ; Hong Kong ; Polymerase Chain Reaction ; Ribotyping
    Chemical Substances Anti-Bacterial Agents
    Language English
    Publishing date 2017-12-08
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-017-17523-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Increased Detection of Emergent Recombinant Norovirus GII.P16-GII.2 Strains in Young Adults, Hong Kong, China, 2016-2017.

    Kwok, Kirsty / Niendorf, Sandra / Lee, Nelson / Hung, Tin-Nok / Chan, Lok-Yi / Jacobsen, Sonja / Nelson, E Anthony S / Leung, Ting F / Lai, Raymond W M / Chan, Paul K S / Chan, Martin C W

    Emerging infectious diseases

    2017  Volume 23, Issue 11, Page(s) 1852–1855

    Abstract: A new recombinant norovirus GII.P16-GII.2 outnumbered pandemic GII.4 as the predominant GII genotype in the winter of 2016-2017 in Hong Kong, China. Half of hospitalized case-patients were older children and adults, including 13 young adults. This ... ...

    Abstract A new recombinant norovirus GII.P16-GII.2 outnumbered pandemic GII.4 as the predominant GII genotype in the winter of 2016-2017 in Hong Kong, China. Half of hospitalized case-patients were older children and adults, including 13 young adults. This emergent norovirus targets a wider age population compared with circulating pandemic GII.4 strains.
    Language English
    Publishing date 2017
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1380686-5
    ISSN 1080-6059 ; 1080-6040
    ISSN (online) 1080-6059
    ISSN 1080-6040
    DOI 10.3201/eid2311.170561
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Rapid emergence and predominance of a broadly recognizing and fast-evolving norovirus GII.17 variant in late 2014.

    Chan, Martin C W / Lee, Nelson / Hung, Tin-Nok / Kwok, Kirsty / Cheung, Kelton / Tin, Edith K Y / Lai, Raymond W M / Nelson, E Anthony S / Leung, Ting F / Chan, Paul K S

    Nature communications

    2015  Volume 6, Page(s) 10061

    Abstract: Norovirus genogroup II genotype 4 (GII.4) has been the predominant cause of viral gastroenteritis since 1996. Here we show that during the winter of 2014-2015, an emergent variant of a previously rare norovirus GII.17 genotype, Kawasaki 2014, ... ...

    Abstract Norovirus genogroup II genotype 4 (GII.4) has been the predominant cause of viral gastroenteritis since 1996. Here we show that during the winter of 2014-2015, an emergent variant of a previously rare norovirus GII.17 genotype, Kawasaki 2014, predominated in Hong Kong and outcompeted contemporary GII.4 Sydney 2012 in hospitalized cases. GII.17 cases were significantly older than GII.4 cases. Root-to-tip and Bayesian BEAST analyses estimate GII.17 viral protein 1 (VP1) evolves one order of magnitude faster than GII.4 VP1. Residue substitutions and insertion occur in four of five inferred antigenic epitopes, suggesting immune evasion. Sequential GII.4-GII.17 infections are noted, implicating a lack of cross-protection. Virus bound to saliva of secretor histo-blood groups A, B and O, indicating broad susceptibility. This fast-evolving, broadly recognizing and probably immune-escaped emergent GII.17 variant causes severe gastroenteritis and hospitalization across all age groups, including populations who were previously less vulnerable to GII.4 variants; therefore, the global spread of GII.17 Kawasaki 2014 needs to be monitored.
    MeSH term(s) Adolescent ; Adult ; Aged ; Australia/epidemiology ; Caliciviridae Infections/epidemiology ; Caliciviridae Infections/virology ; Child ; Child, Preschool ; Disease Outbreaks ; Evolution, Molecular ; Female ; Gastroenteritis/epidemiology ; Gastroenteritis/virology ; Genotype ; Hong Kong/epidemiology ; Humans ; Male ; Middle Aged ; Molecular Sequence Data ; Norovirus/classification ; Norovirus/genetics ; Norovirus/isolation & purification ; Phylogeny ; Seasons ; Viral Proteins/genetics ; Young Adult
    Chemical Substances Viral Proteins
    Language English
    Publishing date 2015-12-02
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms10061
    Database MEDical Literature Analysis and Retrieval System OnLINE

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