A Virus
Her doctor first expressed regret for not telling Susan of the situation. He had experienced fear. Not every day did a patient with a terrible flesh-eating infection enter the building and have to undergo operations they had never had to before. Even though he felt awful, there was more.
A Plant
Susan was questioned about her day prior activities. Prior to going on a date that evening, Susan went on a trek. Fortunately for Susan, the disastrous date was not the cause of everything. Instead, while on their hike, the baby most likely got into contact with an infected plant. but which one?