id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-001401-f29y8vh5	Nelson, Martha I.	Multiyear Persistence of 2 Pandemic A/H1N1 Influenza Virus Lineages in West Africa	2014-07-01		.txt	text/plain	2511	121	47	Increased genetic sequencing of African A/H1N1 pandemic influenza viruses during 2009-2013 revealed multiyear persistence of 2 viral lineages within West Africa, raising questions about the roles of reduced air traffic and the asynchrony of seasonal influenza epidemics among West African countries in the evolution of independent lineages. Increased genetic sequencing of African A/H1N1 pandemic influenza viruses during 2009-2013 revealed multiyear persistence of 2 viral lineages within West Africa, raising questions about the roles of reduced air traffic and the asynchrony of seasonal influenza epidemics among West African countries in the evolution of independent lineages. To elucidate the evolution of influenza viruses in Africa, we conducted a large-scale phylogenetic analysis of global pH1N1 influenza virus diversity during 2009-2013, including 299 pH1N1 HA sequences collected in 18 African countries. Our analysis identified 2 well-supported clades of pH1N1 viruses that each persisted for >1.5 years in West Africa, highlighting the need to further understand the ecology and evolution of IAVs in this understudied and relatively geographically isolated region.	./cache/cord-001401-f29y8vh5.txt	./txt/cord-001401-f29y8vh5.txt