They are preparing for an 'outbreak of' the virus.
an 'outbreak of' violence/war
a cholera 'outbreak'
(..) Covert intel. Original black-baggers, all under Creedy. Alan Percy, Robert Keyes, William Rookwood. The day after the St. Mary's outbreak... ...Percy gives his Beretta a blowjob, Keyes dies in a fire... Rookwood goes missing. Bloody coincidences are making me sick to my stomach. (..)2005 V for Vendetta
(..) starting to break. All the models are forecasting lifted indices from - to -. If the cells keep building, there could be a record outbreak of tornados. This is going to be a long day. Are you sure she'll be there? If I know Jo, she's already dragged her department into the field. (..)1996 Twister
(..) Good. Don't tell anyone about the zombies. Never ever. No, wait... ...can I at least tell Jake? Tell me about what, dude? You know, about the outbreak of zom-- Alright, what's going on? Uhh, nothing at all, buddy! Hey, dude. I think you and Bubblegum are up to something. Ahha ah, what? No, no way. (..)2010 TvShow: Adventure Time Title: Slumber Party Panic Season: 1 Episode 1