Publications by authors named "Marc Ka-Chun Chong"

Article Synopsis
  • The influenza virus constantly evolves to avoid human immunity, requiring annual updates of vaccine strains for effectiveness against seasonal epidemics.* -
  • A new computational method called beth-1 has been developed to forecast virus evolution and select optimal vaccine strains by analyzing mutation fitness and immune response data.* -
  • In tests, beth-1 outperformed existing methods in predicting viral changes and showed better or comparable results in neutralization experiments in mice, making it a valuable tool for selecting influenza vaccine strains.*
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Background: The number of empty nest elderly in China has gradually increased in recent years. There is growing concern about the physical and mental health of this population as empty nest elderly are commonly at the risk of compromising health, home safety and quality of life. This study reported the health and well-being of empty nest elderly with regards to their health status, depression and satisfaction, lifestyle as compared to non-empty nest elderly in China.

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Article Synopsis
  • Multi-population cohorts present a unique chance to study disease risk across diverse samples, but variations in risk factors complicate accurate predictions for complex traits.
  • The proposed Prism Vote (PV) Bayesian framework enables risk predictions by considering genetic data from different subpopulations and allows for personalized risk assessments based on individual ancestry.
  • Simulations and real-world data show that the PV framework significantly boosts prediction accuracy, especially in genetically diverse samples, enhancing the analysis of disease risk and complex traits.
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Endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) is the preferred treatment for patients with acute calculous cholecystitis who are unfit for surgery. The aim of this study was to perform a cost-effective analysis (CEA) comparing EUS-GBD with percutaneous gallbladder drainage (PT-GBD). CEA was performed on patients recruited for our prior randomized controlled trial.

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Article Synopsis
  • Timely evaluation of COVID-19 vaccines is crucial for effective pandemic response, as it helps assess their effectiveness against emerging variants of concern.
  • Analysis of 78 studies found that the genetic distance of circulating SARS-CoV-2 variants from the original vaccine strain significantly predicts vaccine effectiveness (VE), explaining over 86% of the changes in VE.
  • The VE-GD framework allows for real-time predictions of vaccine protection against new variants, helping to inform public health strategies and vaccine distribution.
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Given the heterogeneity in individual transmissibility, we estimated the superspreading potential of SARS-CoV-2 Delta variants. Using case series of Delta variants in Guangdong, China, we found 15% (95%CrI: 12, 19) of cases seeded 80% of offspring cases.

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Background: Severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS), and coronavirus disease 2019 (COVID-19) have caused substantial public health burdens and global health threats. Understanding the superspreading potentials of these viruses are important for characterizing transmission patterns and informing strategic decision-making in disease control. This systematic review aimed to summarize the existing evidence on superspreading features and to compare the heterogeneity in transmission within and among various epidemics of SARS, MERS and COVID-19.

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The effectiveness of seasonal influenza vaccines varies with the matching of vaccine strains to circulating strains. Based on the genetic distance of hemagglutinin and neuraminidase gene of the influenza viruses to vaccine strains, we statistically quantified the relationship between the genetic mismatch and vaccine effectiveness (VE) for influenza A/H1N1pdm09, A/H3N2 and B. We also proposed a systematic approach to integrate multiple genes and influenza types for overall VE estimation.

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Background: Myasthenia gravis (MG), a chronic neuromuscular disorder, can adversely affect patients' health-related quality of life (HRQoL), especially in women. The study aimed to evaluate the difference in HRQoL of women and men MG patients and explore the factors that mediate the relationship between gender and HRQoL.

Methods: A cross-sectional study was conducted among 1815 patients with MG in China.

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Background: Human Enterovirus A71 (EV-A71) is one of the severest enteroviruses that causes hand, foot, and mouth disease (HFMD) among children. This study identified the mutations of EV-A71 VP1 amino acid residues over a number of years and explored the possible association of identified mutations and HFMD epidemic outbreaks in Shenzhen, China.

Methods: A total of 3760 stool specimens were collected from HFMD patients by Shenzhen Centers for Disease Control and Prevention (CDC) between 1998 and 2013.

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Background: Cardiovascular disease (CVD) is a major cause of death in China. Despite government efforts, the majority of hypertensive and diabetic patients in China do not receive proper treatment. Reducing CVD events requires long-term care that is proactive, patient-centred, community-based, and sustainable.

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