剧情：
UnseenEnemyisanessentialexplorationofreasons21st-centurypopulationsareexperiencingarashofdiseasesthatwereonceonlyoutbreaks,buthavenowbecomefull-blownepidemics.Thisincreasedriskthatweface,andthewayssocietyandindividualscanworktogethertoreducethatrisk,areexplainedtothepublicthroughthecasestudiesofthreeepidemics:Ebola,influenzaandZika.Movingacrosstheglobe,wemeetdoctors,diseasedetectivesandeverydaypeoplewhohavesteppedintothehorrorofanepidemicandemergeddeeplychanged.Epidemicsbringoutthebestandworstofhumanbehavior,witheffectsreachingfarbeyondthetollsofsicknessanddeatheee
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