[Considering the number of questions she's just been asking, she's in no position to mind Sebastian's.]

It's not ignorant, don't worry. It's a long story, but my people are all immuno-deficient. We wear these suits to protect us from pathogens, but... nothing's perfect, you know? We make mistakes or something goes wrong and somebody's just really unlucky and... [She shrugs, a small jerk of the shoulder.] It could happen anytime. Especially if you're military - and most of my family and my friends back home are.