Niska doesn't give a damn about any human sicknesses. She's not immune to them and she doesn't really think that she needs to worry about the humans she likes getting sick, not when she's been quietly dosing them with vitamins and keeping an eye out for them.

She's not wholly closed off, no matter what she might project, especially at times like this.

"I'm not going to get sick," she snaps at him, her patience wavering.