George H. W. Bush is in a Houston hospital's intensive care unit due to a lingering cough and fever resulting from bronchitis, the Wall Street Journal is reporting. Though his condition remains under wraps, his cough is said to have improved since admittance.

The former president has been in and out of the hospital for the past month due to complications from the illness. A worsening fever kept him in ICU over Christmas, during which time he was visited by wife Barbara, and sons Neil, Jeb, and the other former president, George W. Bush

"It's an elevated fever, so it's actually gone up in the last day or two," Bush's spokesman in Houston, Jim McGrath, told the WSJ. "It's a stubborn fever that won't go away." Doctors reportedly remain "cautiously optimistic" about his treatment.

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[via Wall Street Journal]