Former President George HW Bush is "responding and recovering" to treatment at a Houston hospital for an infection that had spread to his blood, according to a family spokesman.
Bush has been in hospital since Sunday, a day after attending the funeral of his wife, Barbara, who died last week at age 92.
The couple were married 73 years, longer than any other US presidential couple.
In a brief post on Twitter, family spokesman Jim McGrath said he could "happily" echo his report from Monday that the 93-year-old former president was "responding to treatments and appears to be recovering."
Bush has used a wheelchair and an electric scooter for mobility since developing a form of Parkinson's disease, and he has needed hospital treatment several times in recent years for respiratory problems and other infections.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
McGrath would not elaborate on the specifics of Bush's condition, saying only that he would issue updates "when we have something to update".
A year ago this month, the United States' 41st president spent two weeks in hospital for treatment of pneumonia and chronic bronchitis, a constant irritation of the lining of tubes that carry air to one's lungs.
His doctors said chronic bronchitis is a condition more prevalent with age and can aggravate the symptoms of pneumonia.
Bush was also hospitalised, for 16 days, in January 2017 for pneumonia. During that hospital stay, which included time in intensive care, doctors inserted a breathing tube and connected him to a ventilator.
He was hospitalised in 2015 in Maine after falling at home and breaking a bone in his neck. In December 2014, he was hospitalised for about a week for shortness of breath, and he spent Christmas 2012 in intensive care for a bronchitis-related cough and other issues.
