this paper is concerned with global analysis of a delay sveir epidemiological model in a population of varying size. by using lyapunov stability method and lasalle’s invariance principle for delay systems, we prove that when there is no endemic equilibrium, the disease free equilibrium is globally asymptotically stable, otherwise the endemic equilibrium is globally stable.

Behçet’s disease is a vasculitis with multi-organ involvement. Our knowledge of the psychological aspects of Behçet’s disease is very limited. 40 women and 24 men who fulfilled the International Study Group (ISG) criteria of Behçet’s disease were selected from Behçet’s Disease Clinic of Nemazee Hospital Shiraz, South of Iran. Controls consisted of 65 healthy volunteers. Both patients and contro...

INTRODUCTION More than 60 years have now passed since epidemiological studies first linked tobacco smoking to lung cancer; the 50-year anniversaries of the 1962 Royal College of Physicians of London and 1964 US Surgeon General’s reports, which indicted smoking as causing lung cancer, are approaching. 2 While millions of people have since died prematurely from smoking, the policy and prevention ...

Political scientists bring important tools to the analysis of the coronavirus disease 2019 (COVID-19) pandemic, particularly a focus on the crucial role of power in global health politics. We delineate different kinds of power at play during the COVID-19 crisis, showing how a dearth of compulsory, institutional, and epistemic power undermined global cooperation and fuel...