Becky and Ann talked together outside the student’s room at the student health center the next morning. “You’re right!” Becky exclaimed after viewing photographs of Ellie’s blood up close. “I wish I hadn’t started taking the antibiotics. The little crescent shaped structures that I thought were the bacteria may not be. They aren’t too big to be bacteria, but they aren’t too small to be mitochondria or some kind of protozoan parasite.” “Wait a minute,” Ann replied. “The things on the right are the pathogens? Look at their insides, they can’t be bacteria.” “Why not?” Becky asked.