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Aug 11, 2026Open Access
Methodology: In this paper, we aim to investigate endemic and epidemic transitions in the SEIQRV model using catastrophe theory. By incorporating nonlinear interactions among susceptible, exposed, infected, quarantined, recovered, and vaccinated populations, the model reveals that disease dynamics may undergo abrupt qualitative changes under small variations in epidemiological or control parameters. Using catastrophe-theoretic analysis, we show that epidemic onset, persistence, and elimin...
Aug 10, 2026Open Access
Methodology: This study formulates a 5 × 5 SEIRV (Susceptible-Exposed-Infected-Recovered-Vaccinated) nonlinear epidemic matrix model to investigate epidemic dynamics through catastrophe theory. The nonlinear system is reduced near equilibrium points, and the infected population dynamics are transformed into a cubic structure equivalent to the cusp catastrophe model. Analytical methods are employed to derive conditions for multiple equilibria, bifurcation, and sudden epidemic transiti...
Jan 16, 2026Open Access
Objective: Rheumatoid arthritis (RA) is a chronic autoimmune inflammatory disease. Data from sub-Saharan Africa, particularly Central Africa, remain scarce and diagnosis is often delayed. This study aimed to describe the epidemiological, clinical, biological, radiological, therapeutic, and functional profile of RA in Chad and to situate these findings within the sub-Saharan and international literature. Methods: We conducted a retrospective descriptive study from January 2018 to December 2024 in...
Dec 16, 2025Open Access
The menopause is one period during which various symptoms will be declared. Some can relate to the oral cavity, they are mainly the symptoms of oral discomfort, the gingivitis and the periodontitis. To study closely the relation between menopause and periodont, we carried out a bidirectional, transversal, analytical and epidemiological survey of nearly 60 menopausal women and 60 witnesses consulting within service of gynecology CHU of Casablanca. The goal of this investigation is to locate the l...
Sep 25, 2025Open Access
Introduction: Horton’s disease, also called giant cell arteritis (GCA), is an inflammatory arteritis affecting large and medium caliber arteries with predilection for the cranial branches of the arteries originating of the aortic arch and in particular the external carotid, as well as for ophthalmic arteries. It was first reported in 1890 by Hutchinson. It generally concerns the elderly with a slight female predominance, its incidence is estimated at 17.8/100,000 and 46/100,000,...
Sep 17, 2025Open Access
Introduction: Multiple sclerosis is characterized by demyelination of the white matter of the central nervous system. Multiple sclerosis (MS) manifests clinically by subacute encephalic and/or medullary pictures. In black Africa; a few cases have been reported in Senegal, Kenya and Ivory Coast. In Chad, no study has been carried out to date on Multiple sclerosis (MS). Observation: Mr. AX, 35 years old, a trader with a history of chronic smoking, was admitted on March 13, 2023, for progressive le...
Jul 24, 2025Open Access
Background: The prevalence of comorbid pain and anxiety in clinical observations is high, and the number of publications on the elderly has increased in recent years. Nevertheless, few studies have evaluated comorbid pain and anxiety in the Democratic Republic of Congo (DRC). The aim of this study was to evaluate pain and anxiety and their behavioural consequences in elderly patients followed at Saint Joseph Hospital (SJH) of Limete. Methods: This is a descripti...
Apr 24, 2025Open Access
Objective: The aim of this study is to investigate the awareness and compliance of healthcare professionals to report notifiable diseases at the University Hospital of Casablanca. Methods: A descriptive cross-sectional study was carried out in the university hospital. A self administered questionnaire was used to collect data. It covers socio-demographic characteristics of participants and their knowledge about notifiable diseases, reporting procedures, and their attitudes towards MDR cases. Res...
Jan 17, 2025Open Access
Background: Hepatitis B viral (HBV) infection is a severe global health problem and the most serious type of viral hepatitis. There are an estimated 2 billion individuals infected worldwide, and more than 240 million suffer from chronic illness. Ghana is one of the West African countries which is hyper-endemic for HBV, with a prevalence estimate of 15% of the adult population. This study aimed to identify and examine the factors influencing the awareness and practices of Hepatit...
Dec 05, 2024Open Access
This study presented and analyzed the fractional order model for co-infection of Streptococcus pneumoniae and COVID-19 by adopting the Atangana-Baleanu derivative in Caputo sense. The solution’s boundedness and non-negativity are derived by applying the Laplace transform of the Atangana-Baleanu derivative in Caputo sense. We established the existence and uniqueness of the solutions of the proposed model using Atangana-Baleanu Caputo Integral, and Banach fixed point theorem. The disease-...
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