Figure 1From: Experimental infection of house sparrows (Passer domesticus) with West Nile virus isolates of Euro-Mediterranean and North American originsSurvival of house sparrows infected with different WNV strains. NY99 (open squares), Spain/2007 (closed circles), Italy/2009 (open triangles) and Italy/2008 (open circles). The percentage of house sparrows surviving in each group is plotted against days post-inoculation. No mortality was found in the control group.Back to article page