1.Time-series decomposition and modeling of dengue cases in Malaysia, 2022–2024: a nationwide observational study
Mohamad Afiq Amsyar HAMEDIN ; Kamarul Imran MUSA ; Mohd Rahim SULONG
Osong Public Health and Research Perspectives 2026;17(1):50-60
Objectives:
This study aimed to examine the temporal dynamics of dengue cases in Malaysia from 2022 to 2024 using seasonal-trend decomposition and time-series modeling.
Methods:
Weekly dengue case counts from the national registry were analyzed across all states using seasonal-trend decomposition using LOESS (STL) to separate trend, seasonal, and irregular components. Autoregressive integrated moving average (ARIMA) and seasonal ARIMA(SARIMA) models were fitted to validate temporal structures, with model selection based onthe Akaike information criterion (AIC), corrected AIC, and Bayesian information criterion.Diagnostic checks, including residual analysis and Ljung-Box testing, were performed to ensure model adequacy.
Results:
Dengue incidence showed marked heterogeneity across states. STL decompositionindicated that long-term trends contributed more strongly to case dynamics than seasonality in most states, although seasonal influences were significant in the states of Kedah and Kelantan. Seasonal peak timing varied between states, highlighting differences in epidemic cycles. ARIMA and SARIMA modeling confirmed that no single temporal structure could adequately represent all states; while some series were well fitted by simple ARIMA models,others required seasonal adjustments. Residual diagnostics demonstrated that the selected models were statistically adequate.
Conclusion
Dengue dynamics in Malaysia are shaped by both trend and seasonal components, with considerable variation across states. Combining STL decomposition with ARIMA/SARIMA modeling strengthens the evidence base for state-specific forecasting and proactive vectorcontrol. Tailoring surveillance systems and interventions to local temporal patterns may improve early warning capacity and optimize resource allocation for dengue prevention.
2.A Study of Indoor Environmental Factors in University Offices on Malaysia's East Coast to Enhance Well-Being
Darliana Mohamad ; Ahmad Farhan Shauki Sulong ; Nurdini Mohammad Shukri ; Siti Sarah Abdul Basir ; Norhidayu Noruddin ; Mohd Khalid Ab Kadir@Musa
International Journal of Public Health Research 2025;15(1):2137-2145
This study investigates indoor environmental factors in several offices from one of the university at Malaysia's East Coast, focusing on enhancing occupational health and well-being among university staff by examining lighting quality and thermal comfort. Monitoring sampling were done based on hazard reports logged and data from three main offices or location were collected in this study. Utilizing Extech HD450 Heavy Duty Data Logging Light Meter to measure illuminance, the study found that most sampled points fell below the Occupational Safety and Health Guidelines' recommended range of 300-500 lux, indicating insufficient lighting that can cause visual discomfort and reduce productivity. Thermal comfort assessments, conducted with EVM-7 Indoor Air Quality 3M QUEST and AirPro Solution Models AP500, revealed acceptable temperature and humidity levels but often inadequate air velocity, particularly in the Science Officer's Office, leading to poor air circulation and potential health issues. The study highlights the necessity of improving lighting solutions by installing additional fixtures or upgrading existing ones for sufficient and evenly distributed illumination and enhancing ventilation systems to ensure adequate air movement. Addressing these deficiencies is crucial for creating a conducive working environment, promoting employee satisfaction and productivity. This research focuses solely on monitoring and analyzing the collected data. No qualitative evaluation has been conducted as part of this study. This research advocates for a holistic approach to Indoor Environmental Quality (IEQ), involving regular assessment and targeted interventions to enhance the overall quality of university office environments, ultimately fostering a healthier and more productive workplace.
3.Ameliorative effects of sweet potato leaf extract on mammary gland oxidative stress and rumenmicrobiota in dairy goats under high concentrate feeding pattern
Ziqing XIU ; Ling ZHANG ; Junqiu ZHANG ; Yu CHEN ; Mgeni MUSA ; Yongjiang WU ; Juncai CHEN ; Yawang SUN ; You YANG
Chinese Journal of Veterinary Science 2025;45(9):1952-1964
This study aimed to investigate the effects of sweet potato leaf extract on production per-formance,systematic and mammary gland oxidative stress status and rumen microbiota of dairy goats fed high concentrate diets.Twenty Guanzhong dairy goats with same parity,similar lactation period(120±15)d and healthy body condition were selected and randomly divided into four groups:low-concentrate(LC),low-concentrate supplemented with 1%sweet potato leaf extract(LCS),high-concentrate(HC)and high-concentrate supplemented with 1%sweet potato leaf ex-tract(HCS).The experimental period was 35 days.The results showed that in the third week,milk yield in the HCS group was significantly higher than that in the LC and LCS groups(P<0.05).The content of lipopolysaccharide in the rumen fluid of the HC group was significantly higher than that of the other three groups(P<0.05),the content of malondialdehyde in the serum of the HC group was significantly higher than that of the LCS group(P<0.05),the content of reactive oxygen species,protein carbonyl,8-hydroxydeoxyguanosine in the milk of the HC group was sig-nificantly higher than that of the LC and LCS groups(P<0.05),GSH-Px in HCS group was sig-nificantly higher than that in the other three groups(P<0.05).After the addition of sweet potato leaf extract,there was an increasing trend in the content of Anabaena phylum at the phylum level.In the joint analysis of genera,rumen fluid LPS showed highly significant negative correlation with Succiniclasticum(P<0.01)and negative correlation with Prevotella(P<0.05).Valeric acid was negatively correlated with Prevotella(P<0.05).The pH value was negatively correlated with Treponema(P<0.05).Butyric acid was positively correlated with Anaeroplasma(P<0.05).In conclusion,the addition of sweet potato leaf extract to the diet can increase milk production and al-leviate the state of mammary gland oxidative stress,as well as improving rumen microbial diversi-ty of dairy goats.
4.Ameliorative effects of sweet potato leaf extract on mammary gland oxidative stress and rumenmicrobiota in dairy goats under high concentrate feeding pattern
Ziqing XIU ; Ling ZHANG ; Junqiu ZHANG ; Yu CHEN ; Mgeni MUSA ; Yongjiang WU ; Juncai CHEN ; Yawang SUN ; You YANG
Chinese Journal of Veterinary Science 2025;45(9):1952-1964
This study aimed to investigate the effects of sweet potato leaf extract on production per-formance,systematic and mammary gland oxidative stress status and rumen microbiota of dairy goats fed high concentrate diets.Twenty Guanzhong dairy goats with same parity,similar lactation period(120±15)d and healthy body condition were selected and randomly divided into four groups:low-concentrate(LC),low-concentrate supplemented with 1%sweet potato leaf extract(LCS),high-concentrate(HC)and high-concentrate supplemented with 1%sweet potato leaf ex-tract(HCS).The experimental period was 35 days.The results showed that in the third week,milk yield in the HCS group was significantly higher than that in the LC and LCS groups(P<0.05).The content of lipopolysaccharide in the rumen fluid of the HC group was significantly higher than that of the other three groups(P<0.05),the content of malondialdehyde in the serum of the HC group was significantly higher than that of the LCS group(P<0.05),the content of reactive oxygen species,protein carbonyl,8-hydroxydeoxyguanosine in the milk of the HC group was sig-nificantly higher than that of the LC and LCS groups(P<0.05),GSH-Px in HCS group was sig-nificantly higher than that in the other three groups(P<0.05).After the addition of sweet potato leaf extract,there was an increasing trend in the content of Anabaena phylum at the phylum level.In the joint analysis of genera,rumen fluid LPS showed highly significant negative correlation with Succiniclasticum(P<0.01)and negative correlation with Prevotella(P<0.05).Valeric acid was negatively correlated with Prevotella(P<0.05).The pH value was negatively correlated with Treponema(P<0.05).Butyric acid was positively correlated with Anaeroplasma(P<0.05).In conclusion,the addition of sweet potato leaf extract to the diet can increase milk production and al-leviate the state of mammary gland oxidative stress,as well as improving rumen microbial diversi-ty of dairy goats.
5.Application of machine learning models and landsat 8 data for estimating seasonal pm 2.5 concentrations
Bashir Olasunkanmi AYINDE ; Muhammed Rabiu MUSA ; Abdul-Afeez Olakunle AYINDE
Environmental Analysis Health and Toxicology 2024;39(1):e2024011-
Air pollution is a significant global challenge that affects many cities. In Europe, Bosnia and Herzegovina (BiH) are among the most highly polluted and are mainly affected by air pollution. In this study, we integrate open-source landsat 8 remote sensing products, topographical data, and the limited ground truth PM2.5 data to spatially predict the air quality level across different seasons in Tuzla Canton, BiH by adopting three pre-existing machine learning models, namely XGBoost, K-Nearest Neighbour (KNN) and Naive Bayes (NB). These classification models were implemented based on landsat 8 bands, environmental-derived indices, and topographical variables generated for the study area. Based on the predicted results, the XGBoost model exhibited the highest overall accuracy across all seasons. The predicted model results were used to generate spatial air quality maps. Based on the classification maps, the PM2.5 air quality level predicted for Tuzla Canton in the Winter Season is very unhealthy. The findings conclude that the PM2.5 air quality concentration in Tuzla Canton is relatively unsatisfactory and requires urgent intervention by the government to prevent further deterioration of air quality in Tuzla and other affected cantons in BiH.
6.Biochemical, morphological and molecular assessments of n butanol fraction of Phoenix dactylifera L. following exposure to inorganic mercury on the liver of Wistar rats
Musa Garba ABUBAKAR ; AN AGBON ; SA MUSA ; WO HAMMAN ; SB OLADELE
Laboratory Animal Research 2024;40(2):181-196
Background:
Mercury chloride (HgCl2 ) damages tissues it comes in contact with in sufficient concentration. This study evaluated the protective effects of n-butanol fraction of
7.Tetrapleura tetraptera fruit phenolics fraction protects against the impact of ischemic stroke-induced hippocampal distortions and memory deficits in Wistar rats
Onyinoyi Bethel ONIMISI ; Sunday Abraham MUSA ; Uduak Emmanuel UMANA ; Sonhap James SAMBO ; Wusa MAKENA
Anatomy & Cell Biology 2024;57(4):543-558
Stroke is the most significant cause of disability worldwide. Despite mounting data supporting memory deficit after stroke, dysfunction and treatment effect mechanisms remain unknown. Phenolics can be found in a variety of fruits and vegetables. There is, however, a scarcity of research on the therapeutic potential of the phenolics fraction of Tetrapleura tetraptera (PTT) fruit against ischemic stroke-induced abnormalities in hippocampal tissue. The rats were divided into five groups: Group I, vehicle; group II, ischemia/reperfusion (I/R)+vehicle; group III, I/R+50 mg/kg minocycline (MNC); group IV, I/R+100 mg/kg PTT; and group V, I/R+200 mg/kg PTT. Ischemia was induced via bilateral common carotid artery occlusion for 30 minutes followed by reperfusion. PTT and MNC were intraorally administered daily for 7 days. Neurodegenerative changes, cornu ammonis 1 (CA1) and cornu ammonis 3 (CA3) pyramidal cell count, levels of oxidative stress indicators, and memory functions were assessed. Rats treated with PTT, as well as MNC compared to untreated I/R rats, showed a substantial (P<0.05) rise in catalase, superoxide dismutase, glutathione levels, as well as decreased lipid peroxidation and improved memory. I/R resulted in histoarchitectural distortions, a marked decrease (P<0.05) in the intensity of the Nissl substance, and a striking decrease (P<0.05) in the number of pyramidal cells in the CA1 and CA3. PTT and MNC-treated groups showed significant attenuation in all the above parameters. Taking together, these findings revealed that PTT attenuated oxidative stress, histologic alterations and substantially restored memory impairment in the I/R rat model.
8.Tetrapleura tetraptera fruit phenolics fraction protects against the impact of ischemic stroke-induced hippocampal distortions and memory deficits in Wistar rats
Onyinoyi Bethel ONIMISI ; Sunday Abraham MUSA ; Uduak Emmanuel UMANA ; Sonhap James SAMBO ; Wusa MAKENA
Anatomy & Cell Biology 2024;57(4):543-558
Stroke is the most significant cause of disability worldwide. Despite mounting data supporting memory deficit after stroke, dysfunction and treatment effect mechanisms remain unknown. Phenolics can be found in a variety of fruits and vegetables. There is, however, a scarcity of research on the therapeutic potential of the phenolics fraction of Tetrapleura tetraptera (PTT) fruit against ischemic stroke-induced abnormalities in hippocampal tissue. The rats were divided into five groups: Group I, vehicle; group II, ischemia/reperfusion (I/R)+vehicle; group III, I/R+50 mg/kg minocycline (MNC); group IV, I/R+100 mg/kg PTT; and group V, I/R+200 mg/kg PTT. Ischemia was induced via bilateral common carotid artery occlusion for 30 minutes followed by reperfusion. PTT and MNC were intraorally administered daily for 7 days. Neurodegenerative changes, cornu ammonis 1 (CA1) and cornu ammonis 3 (CA3) pyramidal cell count, levels of oxidative stress indicators, and memory functions were assessed. Rats treated with PTT, as well as MNC compared to untreated I/R rats, showed a substantial (P<0.05) rise in catalase, superoxide dismutase, glutathione levels, as well as decreased lipid peroxidation and improved memory. I/R resulted in histoarchitectural distortions, a marked decrease (P<0.05) in the intensity of the Nissl substance, and a striking decrease (P<0.05) in the number of pyramidal cells in the CA1 and CA3. PTT and MNC-treated groups showed significant attenuation in all the above parameters. Taking together, these findings revealed that PTT attenuated oxidative stress, histologic alterations and substantially restored memory impairment in the I/R rat model.
9.Tetrapleura tetraptera fruit phenolics fraction protects against the impact of ischemic stroke-induced hippocampal distortions and memory deficits in Wistar rats
Onyinoyi Bethel ONIMISI ; Sunday Abraham MUSA ; Uduak Emmanuel UMANA ; Sonhap James SAMBO ; Wusa MAKENA
Anatomy & Cell Biology 2024;57(4):543-558
Stroke is the most significant cause of disability worldwide. Despite mounting data supporting memory deficit after stroke, dysfunction and treatment effect mechanisms remain unknown. Phenolics can be found in a variety of fruits and vegetables. There is, however, a scarcity of research on the therapeutic potential of the phenolics fraction of Tetrapleura tetraptera (PTT) fruit against ischemic stroke-induced abnormalities in hippocampal tissue. The rats were divided into five groups: Group I, vehicle; group II, ischemia/reperfusion (I/R)+vehicle; group III, I/R+50 mg/kg minocycline (MNC); group IV, I/R+100 mg/kg PTT; and group V, I/R+200 mg/kg PTT. Ischemia was induced via bilateral common carotid artery occlusion for 30 minutes followed by reperfusion. PTT and MNC were intraorally administered daily for 7 days. Neurodegenerative changes, cornu ammonis 1 (CA1) and cornu ammonis 3 (CA3) pyramidal cell count, levels of oxidative stress indicators, and memory functions were assessed. Rats treated with PTT, as well as MNC compared to untreated I/R rats, showed a substantial (P<0.05) rise in catalase, superoxide dismutase, glutathione levels, as well as decreased lipid peroxidation and improved memory. I/R resulted in histoarchitectural distortions, a marked decrease (P<0.05) in the intensity of the Nissl substance, and a striking decrease (P<0.05) in the number of pyramidal cells in the CA1 and CA3. PTT and MNC-treated groups showed significant attenuation in all the above parameters. Taking together, these findings revealed that PTT attenuated oxidative stress, histologic alterations and substantially restored memory impairment in the I/R rat model.
10.Tetrapleura tetraptera fruit phenolics fraction protects against the impact of ischemic stroke-induced hippocampal distortions and memory deficits in Wistar rats
Onyinoyi Bethel ONIMISI ; Sunday Abraham MUSA ; Uduak Emmanuel UMANA ; Sonhap James SAMBO ; Wusa MAKENA
Anatomy & Cell Biology 2024;57(4):543-558
Stroke is the most significant cause of disability worldwide. Despite mounting data supporting memory deficit after stroke, dysfunction and treatment effect mechanisms remain unknown. Phenolics can be found in a variety of fruits and vegetables. There is, however, a scarcity of research on the therapeutic potential of the phenolics fraction of Tetrapleura tetraptera (PTT) fruit against ischemic stroke-induced abnormalities in hippocampal tissue. The rats were divided into five groups: Group I, vehicle; group II, ischemia/reperfusion (I/R)+vehicle; group III, I/R+50 mg/kg minocycline (MNC); group IV, I/R+100 mg/kg PTT; and group V, I/R+200 mg/kg PTT. Ischemia was induced via bilateral common carotid artery occlusion for 30 minutes followed by reperfusion. PTT and MNC were intraorally administered daily for 7 days. Neurodegenerative changes, cornu ammonis 1 (CA1) and cornu ammonis 3 (CA3) pyramidal cell count, levels of oxidative stress indicators, and memory functions were assessed. Rats treated with PTT, as well as MNC compared to untreated I/R rats, showed a substantial (P<0.05) rise in catalase, superoxide dismutase, glutathione levels, as well as decreased lipid peroxidation and improved memory. I/R resulted in histoarchitectural distortions, a marked decrease (P<0.05) in the intensity of the Nissl substance, and a striking decrease (P<0.05) in the number of pyramidal cells in the CA1 and CA3. PTT and MNC-treated groups showed significant attenuation in all the above parameters. Taking together, these findings revealed that PTT attenuated oxidative stress, histologic alterations and substantially restored memory impairment in the I/R rat model.


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