id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-214822-pfx1eh5b	Sotolongo-Costa, Oscar	A fractal viewpoint to COVID-19 infection	2020-07-14		.txt	text/plain	2648	167	65	The temporal evolution of contagion over different countries and worldwide brings up a common dynamic characteristic, in particular, its fast rise to reach a maximum followed by a slow decrease (incidentally, very similar to other epidemic processes) suggesting some kind of relaxation process, which we try to deal with, since relaxation is, essentially, a process where the parameters characterizing a system are altered, followed by a tendency to equilibrium values. In this case there is, apart from the change of propagation and development conditions, the possibility for a given country that does not satisfies condition (8), to reach "herd immunity", i.e., when the number of contagions has reached about 60% of population, in which case we may calculate the time to reach such state using (4), assuming t 0 = 0: In Table I we present the relevant fitting parameters, including herd immunity time, T hi and T 1000 , the time to reach a rate of 1000 infections daily.	./cache/cord-214822-pfx1eh5b.txt	./txt/cord-214822-pfx1eh5b.txt