A whole new regeneration, a whole new Doctor. With a new regeneration comes a new immune system, and that new immune system means that it's easier to get sick. Now you have the Time Lord flu! Yippee!

Now you're stuck in bed, feeling miserable and cold, but burning like a furnace. Luckily, you have doctor Martha to look after you.

"Come on, Doctor. Open wide, I need to take your temperature."

She says, practically shoving it into your mouth, then leaving it for the beep. Beep beep. She removes the thermometer from under your tongue and reading the number.

"My God..." She says, not believing what she's reading. One of the highest fevers she's seen.