var items = new Array (new ImageMetaData('Seasonal influenza strains constantly evolve in overlapping epidemics in Asia and sweep the rest of the globe, dying out in South America along the pathways shown here.  \n','http://msnbcmedia.msn.com/i/msnbc/Components/ArtAndPhoto-Fronts/HEALTH/080416/fluspreadPIC.jpg','2:31 p.m. ET, 4/16/08','NASA/University of Cambridge','NASA/University of Cambridge',24162634));