id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-009589-xfdgk2j6	Spradbrow, P. B.	VIRUS DISEASES OF DOMESTIC ANIMALS	2008-03-10		.txt	text/plain	926	57	53	Viruses multiply solely from their genetic material of DNA or RNA when this is introduced into a susceptible cell and provides a code for the production of new virus genetic material and structural components. Much progress has been made towards the grouping (classifying) of related viruses by a consideration of the nature of their genetic material and of certain stable features of the infectious particle or virion. Surprisingly, many veterinary viruses that produce severe disease in conventional animals cause only mild disease in the germ-free host. In fact, the herpesvirus of feline rhinotracheitis is an unusual virus in producing a disease in germ-free animals comparable in severity with that seen naturally (Hoover et a1 1970) . group of agents, and the relative importance of the various defence mechanisms will probably vary with the nature of the infecting virus and of the host.	./cache/cord-009589-xfdgk2j6.txt	./txt/cord-009589-xfdgk2j6.txt