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depicted russian influenza a h1n1 a ussr 90 77 strain virions
presence of a number of novel h1n1 virus virions in this tissue culture sample
administering the h1n1 live attenuated intranasal vaccine laiv to a female recipient
3d graphical representation of ultrastructure and is not specific to a seasonal avian or 2009 h1n1 virus
3 dimensional model of influenza subtypes found in people are influenza a h1n1 and influenza a h3n2 viruses