Here's a short story:

ATLANTA, Georgia (CNN) -- Health and Human Services' acting secretary has appointed Dr. Richard Besser as the interim director for the Centers for Disease Control and Prevention. 

William Gimson will return to his position as the CDC's chief operating officer. 

He replaces William Gimson, who took over as interim CDC director at noon on January 20. 

Gimson notified CDC employees that HHS acting secretary Charles E. Johnson had announced the appointment. 

Gimson replaced Dr. Julie Gerberding, who was the head of the CDC from 2002 until two days ago. 

Gerberding, along with other senior officials, also resigned on January 20, when Barack Obama and his administration took over. 

Past HHS secretary Michael Leavitt said that the interim directors would take over until the next HHS nominee -- former Sen. Tom Daschle -- is confirmed and makes the permanent appointments. 

Gimson told employees he's returning to his post as the CDC's chief operating officer. The CDC usually has a physician as its director, which Gimson is not. 

According to the biography posted on the CDC Web site, Besser's last position at the CDC was as the director of the Coordinating Office for Terrorism Preparedness and Emergency Response, where he was responsible for public health emergency preparedness and emergency response activities. 

According to CDC sources, Besser was seeing patients when he learned of his new position. In addition to heading the CDC bioterrorism preparedness division, he is a practicing pediatrician. 

 (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: What position is being replaced?
Guess: director for the Centers for Disease Control and Prevention
Confidence: <appropriate level of confidence in this guess>

Question: Who is he replacing?
Guess: William Gimson
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: Why is he being replaced?

William Gimson will return to his position