Objective To assess whether the basic reproduction number ( R 0 ) of COVID-19 is different across countries and what national-level demographic, social, environmental factors other than interventions characterize initial vulnerability to virus. Methods We fit logistic growth curves reported daily case numbers, up first epidemic peak, for 58 which 16 explanatory covariates are available. This fi...

We study the global stability issue of the reaction-convection-diffusion cholera epidemic PDE model and show that the basic reproduction number serves as a threshold parameter that predicts whether cholera will persist or become globally extinct. Specifically, when the basic reproduction number is beneath one, we show that the disease-free-equilibrium is globally attractive. On the other hand, ...