1918-1919 2010i-117 2013f-254 2017h-285 20thcentury animalsascarriersofdisease avianinfluenza casereports communicablediseases control diagnosis diagnosticimaging disease diseaseoutbreaks diseasevectors epidemics epidemiology globalhealth governmentpolicy h1n1influenza healthissues history human imaging influenza influenzaavirus influenzaepidemic influenzaepidemic(1918-1919) influenzainbirds influenzapandemic influenzavaccines jurisprudence legislation massvaccination medical modern pandemics pathogenicity prevention preventionandcontrol radiography socialscience transmission wc17 wc515 worldhealth