id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-346853-0c1qdjb5	Holmes, E. C.	The Evolutionary Genetics of Viral Emergence	2007		.txt	text/plain	6123	261	45	Despite the wealth of data describing the ecological factors that underpin viral emergence, little is known about the evolutionary processes that allow viruses to jump species barriers and establish productive infections in new hosts. We also emphasize the current lack of convincing data as to whether viral emergence requires adaptation to the new host species during the early stages of infection, or whether it is largely a chance process involving the transmission of a viral strain with the necessary genetic characteristics. For example, one model of viral emergence posits that adaptation to a new host species during the early period of an epidemic is of fundamental importance, because this raises the basic reproductive rate of the virus, R 0 , to greater than 1, so that sustained transmission networks can be established (Anita et al.	./cache/cord-346853-0c1qdjb5.txt	./txt/cord-346853-0c1qdjb5.txt