By order of appearance:
- In the novel, Index and Himegami Aisa tried to remove fleas from Sphynx. Due to the Index manga skipping the Deep Blood Arc, Index is the only one who tried to remove fleas from Sphynx.
- Sage itself repels fleas.
- Why is Mikoto's sister fighting Accelerator?
- Toaru Majutsu no Index Light Novel Volume 03 Chapter 1 Part 3