WASHINGTON (CNN) - West Virginia Sen. Robert Byrd's hospital stay will likely extend for at least another week, his office said Monday.
Byrd, a 91-year-old Democrat, entered the hospital on May 15 as a precautionary measure. A statement by his office three days later said he was
expected to be released "in a few days."
However, Byrd developed a staph infection while hospitalized, and his office said Monday he "continues to improve but remains in the hospital while he undergoes physical therapy and treatment for" the staph infection.
Byrd, a Democrat, "is not expected" to be in his office this week, according to the statement. It said Sen. Patty Murray, D-Washington, will help fill in for Byrd by managing the chamber's consideration of the Homeland Security Appropriations bill for fiscal year 2010 this week.
"Sen. Byrd is resuming some of his official duties while recuperating, including signing several ... bills as president pro tempore of the Senate, and
working with staff on upcoming appropriations bills," the statement said.
Byrd was first elected to the U.S. Senate in 1958, and is the chamber's longest-serving member.