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Former President George H.W. Bush in Intensive Care Unit

Tom Pennington/Getty Images(HOUSTON) -- Former President George H.W. Bush has suffered “a series of setbacks including a persistent fever,” and “was admitted to the intensive care unit” on Sunday, his spokesman said.

Bush remains in the ICU “in guarded condition,” according to his spokesman, Jim McGrath.

“Doctors at Methodist [Hospital in Houston] continue to be cautiously optimistic about the current course of treatment,” McGrath said Wednesday. He added that the 88-year-old former president is “alert and conversing with medical staff, and is surrounded by family."

President Obama is receiving updates on Bush’s condition.

“Doctors are taking it one day at a time,” McGrath said earlier Wednesday.

Bush has been battling bronchitis and a lingering cough since being admitted to the hospital late last month.

Copyright 2012 ABC News Radio

ABC News Radio