id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-187462-fxuzd9qf	Palladino, Andrea	Modelling the spread of Covid19 in Italy using a revised version of the SIR model	2020-05-18		.txt	text/plain	3209	180	64	We started from a simple Susceptible, Infected, Recovered (SIR) model and we added the condition that, after a certain time, the basic reproduction number $R_0$ exponentially decays in time, as empirically suggested by world data. Hence, at a given time t from the beginning of the spreading of the epidemic, I(t) and S(t) are the number of infected people present in the population and the number of vulnerable people that have not contracted the virus yet, respectively, while R(t) is the sum of the ones that have developed immunity (recovered) or deceased and are therefore removed from the susceptible count. Although a simulation with the standard SIR appears to be adequate to describe an epidemic spreading in a sample where all the initial conditions remain constant throughout the period of time, it is not sufficient when it comes to a more complex and realistic situation such as the population of a given country, where the parameters of the model are influenced by other external factors.	./cache/cord-187462-fxuzd9qf.txt	./txt/cord-187462-fxuzd9qf.txt