id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-285168-qkadqohe	Delatorre, Edson	Tracking the onset date of the community spread of SARS-CoV-2 in Western Countries	2020-04-23		.txt	text/plain	2551	149	55	Here, we estimate the probable onset date of the community spread of SARS-CoV-2 from the cumulative number of deaths reported during the early stage of the epidemic in Western Europe and the Americas. Our results support that SARS-CoV-2 probably started to spread locally in all western countries analyzed between the middle of January and early February 2020, thus long before community transmission was officially recognized and control measures were implemented. In some countries (Italy and Netherlands) community transmission was traced long before (2-4 weeks) the first confirmed SARS-CoV-2 infection case; while in others (Spain, France, United Kingdom, Germany, and Belgium) the onset date roughly coincides with the time of detection of the first imported cases (Figure 1 ). That quite long period of cryptic community transmission (> 4 weeks) in all analyzed countries draws attention to the great challenge of tracking the early global spread of SARS-CoV-2 and supports that control measures should be adopted at least as soon as first imported cases are detected in a new geographic region.	./cache/cord-285168-qkadqohe.txt	./txt/cord-285168-qkadqohe.txt