id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-350510-o4libq5d	Grinfeld, M.	On Linear Growth in COVID-19 Cases	2020-06-22		.txt	text/plain	2154	121	65	We present an elementary model of COVID-19 propagation that makes explicit the connection between testing strategies and rates of transmission and the linear growth in new cases observed in many parts of the world. MODELS We derive, in its simplest and most illuminating form, a system of two difference equations for the rate of growth of new positive test results and the number of people that have been exposed to the virus; that is, we neglect the asymptomatics. (A5) We assume that the information stream is dominated by the rate of increase of the numbers of new positive tests. It would be interesting to investigate models in which g is a function of more than the last day's data, or of undominated maxima in the number of new cases, but we assume here for simplicity that R(n) is a reasonable proxy for the information stream.	./cache/cord-350510-o4libq5d.txt	./txt/cord-350510-o4libq5d.txt