Abstract Background: Dengue fever continues to spread worldwide, particularly in tropical regions. Some patients with dengue fever may progress to severe dengue, which is associated with significantly higher morbidity and mortality. Despite this, no definitive treatment has been found to prevent its progression. Montelukast, a leukotriene receptor antagonist, has shown potential in reducing plasma leakage, a key factor in the pathophysiology of severe dengue. Therefore, this study aimed to evaluate the effectiveness of montelukast in reducing the risk of severe dengue. Methods: A systematic literature search was conducted on April 16, 2025, using keywords related to montelukast and dengue across four databases, which included PubMed, Taylor and Francis, Cochrane Library, and ScienceDirect. A critical appraisal was performed using the Oxford Centre for Evidence-Based Medicine framework, evaluating the validity, importance, and applicability of each study. The primary outcomes were the incidence of dengue shock syndrome and dengue with warning signs. The secondary outcomes included mortality rate and hospitalization duration. Results: This study included three studies involving a total of 1057 patients. Montelukast is associated with a reduced incidence of dengue shock syndrome and shorter duration of hospitalization. However, the effect of montelukast on dengue with warning signs and mortality rate was inconclusive. Conclusion: Montelukast shows potential as an adjuvant therapy in preventing the progression of dengue fever to severe dengue. However, further research is required before montelukast can be widely recommended for dengue fever patients in daily clinical practice and possibly integrated into dengue fever clinical guidelines.
evidence-based case report ; severe dengue ; dengue fever ; leukotriene receptor antagonist ; montelukast

Introduction: Severe thyrotoxicosis is an endocrine emergency that may present with multiorgan dysfunction, particularly when precipitated by systemic infection. Management becomes challenging when hepatic injury limits the use of standard antithyroid therapy. We report a case of severe thyrotoxicosis with acute hepatitis in the setting of dengue IgM positivity. Case: A 44-year-old male with chronic alcohol use presented with epistaxis. On examination, he was deeply jaundiced and had tremors on outstretched hands. Initial investigations showed severe hepatitis with AST 2029 U/L, ALT 698 U/L, total bilirubin 236 µmol/L, alkaline phosphatase 138 U/L, and thrombocytopenia (34 ×10⁹/L). Viral hepatitis HBV, HCV, HIV, and autoimmune hepatitis screen were negative. Dengue IgM was positive. Thyroid function tests demonstrated overt thyrotoxicosis with free thyroxine 4 (FT4) 58.6 pmol/L and suppressed thyroid-stimulating hormone. He was managed as severe thyrotoxicosis with impending thyroid crisis in view of systemic illness and multiorgan involvement. Due to significant hepatic dysfunction, he was treated with propranolol, dexamethasone, and lithium carbonate 300 mg BD. Over 5 days, there was marked clinical improvement with resolution of tachycardia and tremors. FT4 decreased to 44.8 pmol/L. Liver function tests improved significantly (AST 157 U/L, ALT 195 U/L, bilirubin 163 µmol/L), and thrombocytopenia resolved (platelets 323 ×10⁹/L). He remained hemodynamically stable with normal Glasgow Coma Scale throughout admission. Conclusion This case highlights severe thyrotoxicosis with acute hepatitis and dengue infection, where management was complicated by contraindication to conventional antithyroid therapy. Lithium and corticosteroids provided effective biochemical and clinical improvement. Early recognition and individualized therapy are crucial in complex multisystem thyrotoxic presentations.
Hepatitis A ; Thyrotoxicosis ; Dengue

Correctional facilities are a major hub of hepatitis C virus (HCV), with rates far higher than those observed in the general population. Once considered an intractable crisis, the current situation offers a unique opportunity. The advent of direct-acting antivirals has changed the HCV treatment landscape, making its elimination possible. This review summarises the scientific evidence and progress towards HCV elimination in correctional health systems. It outlines the evolution of 'test-and-treat' models, assesses micro-elimination success worldwide, especially in Singapore, and highlights collaborative efforts between Changi General Hospital and Singapore Prison Services. Their implementation of HCV treatment guidelines serves as a key case study in this context. This review also analyses the various barriers - structural, financial, clinical and logistical - that hinder progress. It consolidates strong evidence that prison-based HCV treatment is cost-effective, promotes health equity, supports the World Health Organization 2030 goals and reduces the societal burden of HCV.
Humans ; Singapore ; Antiviral Agents/therapeutic use* ; Hepatitis C, Chronic/epidemiology* ; Prisons ; Prisoners ; Disease Eradication ; Cost-Benefit Analysis ; Hepacivirus ; Correctional Facilities

Objective: To investigate the knowledge of hepatitis C prevention and treatment and related factors among two groups of female sex workers (FSW) and men who have sex with men (MSM) in the Xizang Autonomous Region (Xizang) to provide a basis for the subsequent development of Hepatitis C publicity and education strategies. Methods: From August to September 2021, a special survey was conducted among 1 244 FSW and 234 MSM in 5 districts (counties) of 4 regions in Xizang. A one-on-one face-to-face questionnaire survey was adopted, and the χ² test and logistic regression were used to analyze the related factors of awareness of hepatitis C prevention and treatment among FSW and MSM. Results: The awareness rates of hepatitis C prevention and treatment knowledge among FSW and MSM were 35.0% (436/1 244) and 11.1% (26/234), respectively. Multivariate logistic regression analysis revealed that the positive related factors of FSW' awareness of hepatitis C prevention and treatment knowledge among those who had high school or technical secondary school education (aOR=4.72, 95%CI: 3.30-6.74) and college education or above (aOR=2.24, 95%CI: 1.58-3.18), those who experienced self-perceived risk of HCV infection (aOR=1.87, 95%CI: 1.43-2.45), negative related factors included married or cohabiting (aOR=0.58, 95%CI: 0.35-0.95), divorce or windowless (aOR=0.44, 95%CI: 0.27-0.72), no condom was used in the most recent commercial sexual activity (aOR=0.54, 95%CI: 0.43-0.69). The positive related factors of MSM's awareness of hepatitis C prevention and treatment knowledge were over 40 years old (aOR=8.65, 95%CI: 3.19-23.42) and having a self-perceived risk of HCV infection (aOR=6.25, 95%CI: 2.50-15.61). Conclusions: The awareness rate of hepatitis C prevention and treatment among FSW and MSM was relatively low in Xizang in 2021 and urgently needs to be improved. It is necessary to formulate targeted publicity strategies based on the characteristics of these two groups of people, increase publicity efforts, and expand the coverage of knowledge publicity to popularize key points about the clinical manifestations, treatment options, and transmission routes of hepatitis C, and carry out necessary warnings and education.
Humans ; Male ; Hepatitis C/therapy* ; Health Knowledge, Attitudes, Practice ; Surveys and Questionnaires ; Sex Workers/psychology* ; Homosexuality, Male ; Female ; Adult ; China ; Young Adult ; Middle Aged ; Logistic Models

Humans ; Dengue/epidemiology* ; Child ; Dengue Virus/isolation & purification* ; China/epidemiology* ; Consensus

OBJECTIVE: To investigate chronic hepatitis C virus (HCV) infection's effect on gestational liver function, pregnancy and delivery complications, and neonatal development. METHODS: A total of 157 HCV antibody-positive (anti-HCV[+]) and HCV RNA(+) patients (Group C) and 121 anti-HCV(+) and HCV RNA(-) patients (Group B) were included as study participants, while 142 anti-HCV(-) and HCV RNA(-) patients (Group A) were the control group. Data on biochemical indices during pregnancy, pregnancy complications, delivery-related information, and neonatal complications were also collected. RESULTS: Elevated alanine aminotransferase (ALT) rates in Group C during early, middle, and late pregnancy were 59.87%, 43.95%, and 42.04%, respectively-significantly higher than Groups B (26.45%, 15.70%, 10.74%) and A (23.94%, 19.01%, 6.34%) ( P < 0.05). Median ALT levels in Group C were significantly higher than in Groups A and B at all pregnancy stages ( P < 0.05). No significant differences were found in neonatal malformation rates across groups ( P > 0.05). However, neonatal jaundice incidence was significantly greater in Group C (75.16%) compared to Groups A (42.25%) and B (57.02%) ( χ ² = 33.552, P < 0.001). HCV RNA positivity during pregnancy was an independent risk factor for neonatal jaundice ( OR = 2.111, 95% CI 1.242-3.588, P = 0.006). CONCLUSIONS Chronic HCV infection can affect the liver function of pregnant women, but does not increase the pregnancy or delivery complication risks. HCV RNA(+) is an independent risk factor for neonatal jaundice.
Humans ; Female ; Pregnancy ; Adult ; Pregnancy Complications, Infectious/epidemiology* ; Retrospective Studies ; Pregnancy Outcome ; Infant, Newborn ; Viremia/virology* ; Hepatitis C ; Hepacivirus/physiology* ; Hepatitis C, Chronic/virology* ; Young Adult ; Alanine Transaminase/blood*

This study aims to establish a high-performance size-exclusion chromatography (HPSEC) method for determining the content of the classical swine fever virus (CSFV) E2 protein and screen the optimal stabilizer to enhance the stability of this protein. The optimal detection conditions were determined by optimizing the composition of the mobile phase, and characteristic chromatographic peaks were identified by SDS-PAGE and Western blotting. The specificity, repeatability, precision, linearity, limit of detection (LOD), and limit of quantitation (LOQ) of the method were assessed. The method established was used to determine the content of CSFV E2 protein antigen and vaccine. Differential scanning fluorimetry (DSF) was employed to screen the buffer system, pH, and salt ion concentrations, and sugar, amino acid, and alcohol stabilizers were further screened. The results showed that using a 200 mmol/L phosphate buffer provided the best column efficiency. An antigen-specific chromatographic peak appeared at the retention time of 18 min, which was identified as the CSFV E2 protein by SDS-PAGE and Western blotting. The method exhibited high specificity for detecting the CSFV E2 protein, with no absorbance peak observed in the blank control. The relative standard deviation (RSD) of the peak area for six repeated injections of the CSFV E2 protein was 0.74%, indicating good repeatability of the method. The RSD for repeated detection of two different concentrations of CSFV E2 protein samples by different operators at different time points was less than 2%, suggesting good intermediate precision of the method. The peak area of the CSFV E2 protein was linearly related to its concentration, with the regression equation showing R² of 1.000. The LOD and LOQ of the method were 14.88 μg/mL and 29.75 μg/mL, respectively. Application of the developed method in the detection of three batches of CSFV E2 protein antigen and three batches of vaccine demonstrated results consistent with those from the bicinchoninic acid (BCA) assay, which meant that the method could accurately determine the content of CSFV E2 protein antigen and vaccine. The DSF method identified 50 mmol/L Tris-HCl at pH 8.0 as the optimal buffer, and the addition of sugar and alcohol stabilizers further improved the stability of the CSFV E2 protein. The HPSEC method established in this study is simple, fast, and exhibits good accuracy and repeatability, enabling precise measurement of the CSFV E2 protein content. It is expected to play a crucial role in the quality control of the CSFV E2 vaccine. Furthermore, the strategy for improving the CSFV E2 protein stability, identified through DSF screening, has significant implications for enhancing the stability of the CSFV E2 vaccine.
Classical Swine Fever Virus/chemistry* ; Chromatography, Gel/methods* ; Animals ; Swine ; Viral Envelope Proteins/immunology*

OBJECTIVE

To describe a case of dengue-associated bilateral neuroretinitis in a young female adult.

This is a case report.

A 25-year-old female was referred for evaluation of bilateral blurring of vision during the convalescent stage of dengue fever. Visual acuity was 20/80 in each eye. Fundoscopy showed mild optic disc swelling, macular thickening, and hard exudates bilaterally. Dengue-associated neuroretinitis was considered. Intravenous methylprednisolone treatment for three days resulted in significant improvements in visual function and resolution of fundus abnormalities.

Dengue is a potential etiology of neuroretinitis in endemic areas, especially in those who develop visual symptoms during the convalescent phase. Prompt recognition and treatment may prevent long-term visual impairment.

OBJECTIVE

Dengue remains a critical public health concern in the Philippines. Late consultation and delayed presentation of dengue patients to hospitals constantly challenge doctors. This study aimed to identify factors contributing to late consultation of dengue patients.

This analytic, cross-sectional study examined patient, parental, socioeconomic, cultural, and health system factors influencing delayed consultation among parents of patients 0 – 18 years at Batangas Medical Center and Lipa Medix Medical Center. A total of 668 parents were enrolled. Descriptive statistics and frequency tables summarized the key characteristics. Test of proportions assessed differences between groups. Univariate logistic regression screened possible predictors, followed by multiple logistic regression to identify significant factors.

Univariate analysis identified significant predictors of late consultation, including older patient age(p=0.002), residence >50 km from the hospital (p 50 km from the hospital were 2.7 times more likely to consult late (p=0.01).

Delayed consultation was influenced by the patient age, hospital type, geographic distance from the hospital, maternal marital status, and cultural beliefs in home remedies and faith healing. Strategies to improve early consultation should consider these factors.

OBJECTIVE

To determine whether neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR) within the first three days of dengue illness are independent predictors of dengue severity among pediatric patients.

A cross-sectional analytical retrospective study was conducted among pediatric dengue patients admitted to The Medical City, Pasig from September 2021 to August 2024. Data collection was done through electronic chart review. Baseline characteristics were analyzed using the Kruskal-Wallis test, Chi-Square test, and Fisher’s exact test. Receiver Operating Characteristic (ROC) and Area Under the Curve (AUC) analyses, along with diagnostic performance metrics, were used to evaluate daily ratio cut-offs differentiating dengue classifications. Multivariable logistic regression was performed to assess NLR and PLR as independent predictors of warning signs or severe dengue development.

Among the 316 subjects included in the analysis, 40.5% had dengue fever without warning signs, 57.3% had dengue fever with warning signs, and 2.2% had severe dengue. Differentiating patients without warning signs from those with warning signs, the NLR cut-offs were 4.73, 2.07, and 2.5 on days 1-3, respectively, whereas from those with severe dengue, the cut-offs were 1.27, 0.68, and 0.47 on the same days. For this pairwise analysis, PLR cut-offs were 170, 233.92, and 208.79 for the first comparison; and 209.24, 244.12, and 187.5 for the second, respectively. Statistical analysis showed poor discrimination and diagnostic performance for all cut-offs. Likewise, multivariable linear regression revealed no significant correlation between either ratio and dengue severity.

NLR and PLR within the first three days of dengue illness revealed poor performance in predicting the development of warning signs or progression to severe dengue among pediatric patients.