(CNN) – Former President George H.W. Bush remains in a Houston hospital Thursday after being treated for bronchitis, his spokesman said. His office said he was in stable condition.
Bush, 88, has been hospitalized at Houston's Methodist Hospital for six days and has a "lingering cough," spokesman Jim McGrath told CNN.
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"President Bush has been in and out of The Methodist Hospital in the Texas Medical Center being treated for complications related to his bronchitis," his office said in a statement. "He is in stable condition, and is expected to be released within the next 72 hours."
Bush has a form of Parkinson's disease that affects his legs and requires him to use a wheelchair.
He is the oldest living former president and a World War II veteran.
He was previously hospitalized overnight in 2007 after a fainting spell caused by dehydration and hot weather while golfing in California.
– CNN's Chuck Johnston contributed to this report.
From CNN Politics
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Get well soon sir.
A warm and gentle soul- Met him once at a political rally – Get well soon.
Best wishes for a speedy recovery, we need men like you around to remind us of greatness, patriotism and putting country first, just as you did. God Bless you Mr. President.
As much as I dislike him as a president, no one should be sick for the holidays. I hope he gets well soon and finishes his life long and strong.
Get well soon!
I too am a democrat, but at times like this it doesn't matter. Prayers for a good health report and strength for you and your family. Get well soon President Bush
Dear Bush Family,
I sincerely hope he recovers before the weekend arrives, however I will keep him in my prayers...
I would just like to say it was an honor serving under command as Commander in Chief...
Thanks again for sacrificing your family for the benefit of our country because protecting America couldn't be done without grooming someone to assume the responsibility, and you groomed your own children to maintain and build this country... Eventhough a lot of America doesn't understand the bigger picture just know this Urban American appreciated your loyalty and dedication...
Integrity and Respekt,
Kimeyo J Daniels
USMC
get well soon, dear. I will continue praying for u.
Get well soon ole fella!
God Bless you Mr. President. Get well soon, sir.
Semper Fidelis
Get Well soon
Praying for a speedy recovery for a great man 
Get well H W
Get well soon I truly respect you as a gentleman and a veteran and a good president.
You will be OK Mr. Bush. Keep strong and fight what is disturbing you. You are in our prayers.
The last president from "The Greatest Generation".
Great American!
Hope you are well and home for the holidays! Praying for a speedy recovery.
I am praying that you get better and that you can return home to Barbara
His willingness to work hand in hand with a former opponent for the good of all shows his integrity. Best wishes for a fast recovery.
May God take care of you and get you home soon Mr President.
Good well soon and have a speedy recovery Mr. President.
Get well, sir.
Good luck to you Mr. President. Wishing you a speedy recovery.
My God bless you with a speedy recovery & great health. Many more years to come as well. Wishing you well.
Get better soon