Who Gave Dr. Colbert His Cold?

Certain Americans must be protected in the event of global disasters and alien invasion. One of these important people is Our Glorious Stephen.

Anyone who endangers any of these important Americans is immediately dispatched.

Background
On the April 17, 2007 "The Colbert Report" Dr. Colbert had a noticeable infected vocal countenance. On the next episode, he valiantly denied having a cold, but everyone in the nation knew someone had given him a disease.

But who?

Tad
Tad is really the only suspect.

In a previous episode, Dr. Colbert showed Tad galvanting with birds. Some of these birds may have been carrying the avian flu, which Tad picked up and gave to Dr. Colbert.