Publications by authors named "Chim Chan"

Malaria rapid diagnostic tests (RDTs) targeting the Plasmodium falciparum histidine-rich protein 2 (PfHRP2) are widely used to diagnose P. falciparum infection. However, reports of P.

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  • This study investigates mixed-species malaria infections in children in the Lake Victoria region of Kenya over multiple years, revealing a high prevalence of both single and co-infections.
  • Results show that while Plasmodium falciparum (Pf) was the dominant species, significant rates of co-infections with P. malariae (Pm) and P. ovale (Po) were found, affecting clinical outcomes.
  • The findings suggest that mixed infections may alter the manifestation of malaria, leading to decreased fever but increased risks of splenomegaly and anemia, highlighting the need for better diagnostic approaches.
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  • The CYP3A4 enzyme is crucial for metabolizing about 30% of drugs, including key antimalarials, and variations in this enzyme can lead to differences in drug metabolism among individuals.
  • Researchers studied CYP3A4 polymorphisms in populations from malaria-affected regions in Lake Victoria, Kenya, and Vanuatu, analyzing archived blood samples to find genetic variations.
  • They identified multiple single nucleotide polymorphisms (SNPs) in both regions, with a higher level of genetic variance in Vanuatu, contributing to better understanding and potential improvements in personalized medicine for antimalarial treatments.
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Background: Five years after successful malaria elimination, Aneityum Island in Vanuatu experienced an outbreak of Plasmodium vivax of unknown origin in 2002. Epidemiological investigations revealed several potential sources of P. vivax.

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Malaria control initiatives require rapid and reliable methods for the detection and monitoring of molecular markers associated with antimalarial drug resistance in Plasmodium falciparum parasites. Ngodhe island, Kenya, presents a unique malaria profile, with lower P. falciparum incidence rates than the surrounding region, and a high proportion of sub-microscopic and low-density infections.

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  • Malaria remains a significant health threat in the Lake Victoria Basin of western Kenya, where traditional prevention methods like insecticide-treated nets (LLINs) are less effective due to insecticide resistance.
  • New approaches, such as ceiling nets made with PBO-LLIN, show promise in enhancing malaria control by addressing behavioral and resistance issues.
  • A study is being conducted to evaluate the effectiveness of Olyset®Plus ceiling nets in reducing malaria prevalence in children on Mfangano Island, potentially influencing broader malaria elimination strategies in Kenya.
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Rapid research is essential to assess impacts in communities affected by disasters, particularly those communities made "hard-to-reach" due to their active marginalization across history and in contemporary practices. In this article, we describe two rapid research projects developed to assess needs for and experiences of communities hard-hit by disasters. The first is a project on the COVID-19 pandemic in southern New Mexico (USA) that was developed to provide information to local agencies that are deploying programs to rebuild and revitalize marginalized communities.

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Background: Displacement due to natural disaster exposure is a major source of distress, and disproportionately affects people in low- and middle-income countries (LMICs). Public mental health resources following natural disasters and displacement are often limited in LMICs. In 2017, the population of one island in Vanuatu, a lower-middle income country, was displaced due to volcanic activity.

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Background: Simple and accurate diagnosis is a key component of malaria control programmes. Microscopy is the current gold standard, however it requires extensive training and the results largely rely on the skill of the microscopists. Malaria rapid diagnostic tests (RDT) can be performed with minimal training and offer timely diagnosis, but results are not quantitative.

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Hair follicles undergo cycles of regeneration fueled by hair follicle stem cells (HFSCs). While β-catenin-dependent canonical Wnt signaling has been extensively studied and implicated in HFSC activation and fate determination, very little is known about the function of β-catenin-independent Wnt signaling in HFSCs. In this study, we investigate the functional role of ROR2, a Wnt receptor, in HFSCs.

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Characterising the genomic variation and population dynamics of Plasmodium falciparum parasites in high transmission regions of Sub-Saharan Africa is crucial to the long-term efficacy of regional malaria elimination campaigns and eradication. Whole-genome sequencing (WGS) technologies can contribute towards understanding the epidemiology and structural variation landscape of P. falciparum populations, including those within the Lake Victoria basin, a region of intense transmission.

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Unlabelled: Poor maternal mental health during pregnancy is associated with adverse birth outcomes, including lower birthweight and gestational age. However, few studies assess both mental health and diet, which might have interactive effects. Furthermore, most studies are in high-income countries, though patterns might differ in low- and middle-income countries (LMICs).

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While CYP2D6 allele and phenotype frequencies have been extensively studied, currently, very little ethnically specific data is available regarding the East African and South Pacific region, including Kenya and Vanuatu. The absence of information regarding gene polymorphisms and their resulting clinical effects in these populations may hinder treatment strategies and patient outcome. Given the scarceness of CYP2D6 related data in these populations, the purpose of this study was to perform a pharmacogenomic analysis of the Kenyan and Ni-Vanuatu population and ultimately characterize the enzymatic properties of eight novel CYP2D6 variant proteins expressed in 293FT cells in vitro using dextromethorphan as a substrate.

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Article Synopsis
  • - WHO recommends mass drug administration (MDA) for malaria elimination, but challenges exist in effectively implementing it, as shown by a study on Ngodhe Island, Kenya, where MDA was conducted with high compliance.
  • - Following MDA treatment, Plasmodium malaria prevalence initially dropped significantly but then rebounded two months later, highlighting issues with local transmission and the impact of human movement on malaria resurgence.
  • - Analysis of individuals arriving on the island revealed that certain age groups and travelers from specific regions had higher infection rates, emphasizing the need for regional collaboration and local vector control measures to maintain malaria elimination efforts.
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The skin functions as a barrier between the organism and the surrounding environment. Direct exposure to external stimuli and the accumulation of genetic mutations may lead to abnormal cell growth, irreversible tissue damage and potentially favor skin malignancy. Skin homeostasis is coordinated by an intricate signaling network, and its dysregulation has been implicated in the development of skin cancers.

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Cancer, a complex yet common disease, is caused by uncontrolled cell division and abnormal cell growth due to a variety of gene mutations. Seeking effective treatments for cancer is a major research focus, as the incidence of cancer is on the rise and drug resistance to existing anti-cancer drugs is major concern. Natural products have the potential to yield unique molecules and combinations of substances that may be effective against cancer with relatively low toxicity/better side effect profile compared to standard anticancer therapy.

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Natural disasters have major consequences for mental health in low- and middle-income countries. Symptoms are often more pronounced among women. We analyzed patterns and predictors of distress among pregnant and non-pregnant women 3-4 and 15-16 months after a cyclone in Vanuatu, a low- to middle-income country.

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Objective: The present study evaluates the use of multiple correspondence analysis (MCA), a type of exploratory factor analysis designed to reduce the dimensionality of large categorical data sets, in identifying behaviours associated with measures of overweight/obesity in Vanuatu, a rapidly modernizing Pacific Island country.

Design: Starting with seventy-three true/false questions regarding a variety of behaviours, MCA identified twelve most significantly associated with modernization status and transformed the aggregate binary responses of participants to these twelve questions into a linear scale. Using this scale, individuals were separated into three modernization groups (tertiles) among which measures of body fat were compared and OR for overweight/obesity were computed.

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Background: Past studies show relationships between disaster-related displacement and adverse psychosocial health outcomes. The development of psychosocial interventions following displacement is thus increasingly prioritized. However, data from low- and middle-income countries (LMICs) are lacking.

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Objectives: To determine whether (1) maximal handgrip strength (HGS) is associated with inter-island level of economic development in Vanuatu, (2) how associations between island of residence and HGS are mediated by age, sex, body size/composition, and individual sociodeomographic variation, and (3) whether HGS is predictive of hypertension.

Material And Methods: HGS was collected from 833 adult (aged 18 and older) men and women on five islands representing a continuum of economic development in Vanuatu. HGS was measured using a handheld dynamometer.

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Ethnopharmacological Importance: Leptospermum flavescens has been used traditionally in Malaysia to treat various ailments such as constipation, hypertension, diabetes and cancer.

Aim Of Study: To investigate the potential protective effects of L. flavescens in pancreatic β cells through inhibition of apoptosis and autophagy cell death mechanisms in in vitro and in vivo models.

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Dioscorea bulbifera, also known as air potato, has been cultivated as food crop mainly in tropical countries in Asia and Australia. The tubers are edible and have often been used in Traditional Chinese Medicine (TCM) and Ayurvedic medicine to treat cancer, diabetes, thyroid disease, and inflammation. This study aimed to investigate the effects of D.

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Mangrove derived microorganisms constitute a rich bioresource for bioprospecting of bioactive natural products. This study explored the antioxidant potentials of bacteria derived from mangrove soil. Based on 16S rRNA phylogenetic analysis, strain MUM292 was identified as the genus .

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Background: Maternal stress during pregnancy is associated with birth outcomes, including birthweight. Exposure to natural disasters during pregnancy provides a model to study these relationships. However, few studies assess both stress and diet, which might have interactive effects.

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