She slowly stood, making her shuffling way across the floor to the couch, which she sank onto gratefullly.  It had taken almost far too much effort to make it this far.  

She listened to his story, her brow furrowed in concentration, as she listened to him tell her how the world had ended.  

"I... I don't understand it.  There should have been methods for containing the illness, on average at least 30% of any given population is immune to any pandemic, it is how we have survived for millenia.  Did they locate patient Zero?"  She asked shifting to look at him better.  

"What do the epidemiological studies say?" she demanded.   She couldn't tell you why she wanted to know this information, but she apparently needed it.  

She stood up off the couch her head still pounding.  She leaned over grabbing the arm until her head cleared enough for her to stand again.  

"It can't be that dire... what is the transmission vector?"