id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-158545-qp5aemzw	Stier, Andrew J.	COVID-19 attack rate increases with city size	2020-03-23		.txt	text/plain	2529	128	53	Here, we estimate the growth rates and reproductive numbers of COVID-19 in US cities from March 14th through March 19th to reveal a power-law scaling relationship to city population size. This means that COVID-19 is spreading faster on average in larger cities with the additional implication that, in an uncontrolled outbreak, larger fractions of the population are expected to become infected in more populous urban areas. The growth rate of COVID-19 cases is approximately 2.4 times faster in New York-Newark-Jersey compared to Oak Harbour, WA (b) In the absence of effective controls, larger cities are expected to have more extensive epidemics than smaller cities, Eq. Second, the size of an epidemic outbreak, as measured by the percent of the population that becomes infected, is also related to the reproductive number. In order to estimate the reproductive number R we multiplied the growth rate of each city, r, by an average infections period of 1/γ = 4.5 days and adding one (see below).	./cache/cord-158545-qp5aemzw.txt	./txt/cord-158545-qp5aemzw.txt