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Microplastic pollution in freshwater systems in Southeast Asia: contamination levels, sources, and ecological impacts

Chen HL, Selvam SB, Ting KN, Gibbins CN

Environ Sci Pollut Res Int, 2021 Oct;28(39):54222-54237.
PMID: 34386926 DOI: 10.1007/s11356-021-15826-x

Plastics are synthetic polymers known for their outstanding durability and versatility, and have replaced traditional materials in many applications. Unfortunately, their unique traits ensure that they pose a major threat to the environment. While literature on freshwater microplastic contamination has grown over the recent years, research undertaken in rapidly developing countries, where plastic production and use are increasing dramatically, has lagged behind that in other parts of the world. In the South East Asia (SEA) region, basic information on levels of contamination is very limited and, as a consequence, the risk to human and ecological health remains hard to assess. This review synthesises what is currently known about microplastic contamination of freshwater ecosystems in SEA, with a particular focus on Malaysia. The review 1) summarises published studies that have assessed levels of contamination in freshwater systems in SEA, 2) discusses key sources and transport pathways of microplastic in freshwaters, 3) outlines what is known of the impacts of microplastic on freshwater organisms, and 4) identifies key knowledge gaps related to our understanding of the transport, fate and effects of microplastic.
Spatio-temporal variation of microplastic along a rural to urban transition in a tropical river

Chen HL, Gibbins CN, Selvam SB, Ting KN

Environ Pollut, 2021 Nov 15;289:117895.
PMID: 34364115 DOI: 10.1016/j.envpol.2021.117895

Microplastic pollution is widely recognised as a global issue, posing risks to natural ecosystems and human health. The combination of rapid industrial and urban development and relatively limited environmental regulation in many tropical countries may increase the amount of microplastic entering rivers, but basic data on contamination levels are lacking. This is especially the case in tropical South East Asian countries. In this paper, the abundance, composition and spatio-temporal variation of microplastic in the Langat River, Malaysia, were assessed, and the relationship between microplastic concentration and river discharge was investigated. Water samples were collected over a 12-month period from 8 sampling sites on the Langat, extending from forested to heavily urbanised and industrial areas. All 508 water samples collected over this period contained microplastic; mean concentration across all sites and times was 4.39 particles/L but extended up to 90.00 particles/L in some urban tributaries. Most microplastics were secondary in origin, and dominated by fibres. Microplastic counts correlated directly with river discharge, and counts increased and decreased in response to changes in flow. A time-integrated assessment of the microplastic load conveyed by the Langat suggested that the river is typically (50 % of the time) delivering around 5 billion particles per day to the ocean. The positive correlation between the concentration of microplastics and suspended sediments in the Langat suggested that continuously logging turbidity sensors could be used to provide better estimates of microplastic loads and improve assessment of human and ecological health risks.
Fulltext Prevalence, risk factors and treatment outcomes of syphilis among people living with human immunodeficiency virus at primary care clinics in Malaysia: A retrospective study

Gani AH, Saleh NA, Selvam SB, Azwa I

Malays Fam Physician, 2024;19:13.
PMID: 38496768 DOI: 10.51866/oa.471

INTRODUCTION: Syphilis and human immunodeficiency virus (HIV) coinfection is a common clinical problem with a significant rising trend worldwide. In Malaysia, the burden of care is shared between hospitals and primary care clinics. This study aimed to determine the prevalence of syphilis among people living with HIV (PLHIV) at primary care clinics in Malaysia and assess its association with sociodemographic characteristics, risk factors and treatment outcomes.
METHODS: This retrospective study included 750 PLHIV aged ≥18 years who attended primary care clinics in three different locations in Malaysia from 1 January 2017 to 31 December 2019. Data were obtained from the patients' clinical notes using a structured questionnaire evaluating the sociodemographic characteristics, history of sexual and lifestyle behaviours, diagnosis and management.
RESULTS: The patients' age ranged from 18 to 78 years (mean=34.7, standard deviation=10.2). The prevalence of syphilis among the PLHIV at the three primary care clinics was 33.8% (n=254). Syphilis was significantly associated with gender (P=0.038) as well as sexual activity (P<0.001), substance use (P=0.038), history of chemsex (P=0.001) and history of sexually transmitted infections (STIs) (P<0.001) within the past 12 months. The majority of the PLHIV with syphilis received treatment at the primary care clinics (n=248, 97.3%), and up to 96.1% (n=245) had completed such treatment.
CONCLUSION: Syphilis is prevalent among PLHIV at primary care clinics, and most patients receive standard treatment. Therefore, primary care doctors must enhance their knowledge to effectively manage STIs, especially syphilis.
Microplastic concentrations in river water and bed sediments in a tropical river: implications for water quality monitoring

Chen HL, Selvam SB, Ting KN, Gibbins CN

Environ Monit Assess, 2023 Jan 18;195(2):307.
PMID: 36652034 DOI: 10.1007/s10661-022-10856-5

Recent increase in awareness of the extent of microplastic contamination in marine and freshwater systems has heightened concerns over the ecological and human health risks of this ubiquitous material. Assessing risks posed by microplastic in freshwater systems requires sampling to establish contamination levels, but standard sampling protocols have yet to be established. An important question is whether sampling and assessment should focus on microplastic concentrations in the water or the amount deposited on the bed. On three dates, five replicated water and bed sediment samples were collected from each of the eight sites along the upper reach of the Semenyih River, Malaysia. Microplastics were found in all 160 samples, with mean concentrations of 3.12 ± 2.49 particles/L in river water and 6027.39 ± 16,585.87 particles/m2 deposited on the surface of riverbed sediments. Fibres were the dominant type of microplastic in all samples, but fragments made up a greater proportion of the material on the bed than in the water. Within-site variability in microplastic abundance was high for both water and bed sediments, and very often greater than between-site variability. Patterns suggest that microplastic accumulation on the bed is spatially variable, and single samples are therefore inadequate for assessing bed contamination levels at a site. Sites with the highest mean concentrations in samples of water were not those with the highest concentrations on the bed, indicating that monitoring based only on water samples may not provide a good picture of either relative or absolute bed contamination levels, nor the risks posed to benthic organisms.
Development of a Sexually Transmitted Disease Client-friendly Unit at a Primary Care Clinic in Malaysia: Lessons Learnt

Pannir Selvam SB, Khoo EM, Chow SY, Wong PF, Mohsin SS, Abdullah A, et al.

Sex Transm Dis, 2019 02;46(2):143-145.
PMID: 30278029 DOI: 10.1097/OLQ.0000000000000918

Management of sexually transmitted diseases and human immunodeficiency virus is challenging due to the social stigma attached. We describe the development of a client-friendly sexually transmitted disease service in a primary care clinic in Malaysia with a special focus on key populations. Challenges and key lessons learnt from its development and implementation are discussed.
Fulltext Mobility and fear of falls measuring tools to predict falls risk among malaysian community dwelling older adults. [Abstract]

Ajit Singh DK, Ng ES, Ng CP, Ab Rahman NNA, Pannir Selvam SB

Jurnal Sains Kesihatan Malaysia, 2018;16(101):225-226.
MyJurnal DOI: 10.17576/JSKM-2018-35

Falls is a global health issue among older adults. Identifying measuring tools that can predict falls risk among older adults can assist in early falls risk detection and prevention. Best measuring tools that can predict falls risk among Malaysian community dwelling older adults is not known. The objective of our study was to determine if Timed Up and Go (TUG) test and Activities-Specific Balance Confidence (ABC) scale could be used as a falls risk predictor tools among Malaysian community dwelling older adults. Hundred and six (n = 106) community dwelling older adults who were attending Klinik Kesihatan Cheras participated in this cross sectional study. Falls incidence in the past one year was obtained from the participants. TUG test was performed and ABC scale was administered. Data was analysed using binomial logistic regression and receiver operating curves (ROC). The cut off values identified for TUG test and ABC scale were 9.02 seconds (area under the curve, AUC was 0.711; 95% CI 0.577-0.844) and 82.81% (area under the curve, AUC was 0.682; 95% CI 0.562-0.802) respectively. Hence, older adults with a score of above 9.02 seconds for TUG test and a score of below 82.81% for ABC scale were noted to have a higher risk of falls. Results of this study demonstrated that both TUG test (p < 0.001) and ABC scale (p < 0.01) were significant predictors of falls risk. Our study results indicated that both mobility (TUG test) and fear of falls (ABC scale) measuring tools, with the present cut off values can be used to identify community dwelling older adults who are at a higher risk of falls. Identifying older adults with higher risk of falls can assist the health professionals to optimise falls prevention and management approaches.