id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-021465-2pj26fmv	PERDUE, MICHAEL L.	Impact of Avian Viruses	2007-05-09		.txt	text/plain	14076	696	46	Although there is variation in the economic or ecological impact of various viral groups from year to year and among geographic sites, the "Top Ten" list of virus groups exhibiting routine significant impact on commercial poultry worldwide (not necessarily in order of impact) are paramyxoviruses (Newcastle disease); coronaviruses (infectious bronchitis); herpesviruses (infectious laryngotracheitis; Marek's disease; duck enteritis); reoviruses (viral arthritis); picornaviruses (avian encephalomyelitis); adenoviruses (egg drop syndrome); retroviruses (lymphoid leukosis); orthomyxoviruses (avian influenza); poxviruses (fowlpox); and birnaviruses (infectious bursal disease). With the recent documented transmission of a lethal avian influenza virus from commercial poultry to humans, these ecological relationships take on new significance. Lymphomas caused by MDV and retroviruses are still the most common viral neoplastic diseases of poultry, and a recent increase in mortality and evolution of more virulent MDV strains indicates that the impact of these viruses will continue to be felt (Witter, 1996) .	./cache/cord-021465-2pj26fmv.txt	./txt/cord-021465-2pj26fmv.txt