He was admitted to Houston Methodist Hospital early Sunday, just a day after bidding a final farewell to his wife of 73 years during a funeral in the same Texas city.
He attended the funeral wearing a pair of knitted socks decorated in blue, red and yellow books - a tribute to his late wife's work promoting literacy.
A spokesperson for the household says Bush contracted an an infection that unfold to his blood, is "responding properly" to therapy.
Mr. Bush is 93 years old. Doctors say it's been touch and go and at times were anxious President Bush would not survive after his blood pressure became dangerously low. "We will issue additional updates as events warrant".
Barbara Bush passed away last Tuesday at 92.
"He's the most goal-oriented person on this planet", McGrath said.
United Nations in security talks with Syria after chemical probe put on hold
OPCW inspectors arrived in Syria on April 14 to collect samples to either confirm or dismiss reports on the chemical attack. Russian Federation and its ally deny that.
After a handsome ceremony Saturday, former first lady Barbara Bush has reached her final resting place at the George Bush Library and Museum in College Station, and visitors are already lining up to visit. Jeb Bush said, "I think Dad got sick on goal so that he could be with her".
Bush, who suffers from Parkinson's disease and is wheelchair-bound as a result, has been repeatedly hospitalized for pneumonia.
The story adds that Bush's family has been concerned about how he would handle the stress of losing his wife.
"The more of these parameters are abnormal, the more serious the case is", he said.
Bush, the 41st president of the United States, served from 1989 to 1993.