Sen. Robert Byrd (D-W.Va.), the Senate’s longest-serving Member, was taken to the hospital late last week “as a precautionary measure— after his temperature spiked because of a minor infection.

[IMGCAP(1)]Byrd, 91, “is being treated with antibiotics, responding well, and is expected to be released from the hospital in a few days— a statement released Monday by his office said.

The statement didn’t reveal where Byrd is being treated, nor did it specify the type of infection he is being treated for.

The ailing Democratic Senator has been admitted to the hospital a few times over the past year. In June, he also had been treated for a minor infection.

Byrd’s health became an issue last year when he chaired the powerful Appropriations Committee. After a quiet push from Democratic leaders, Byrd voluntarily gave up the gavel in the 111th Congress. He still chairs the Appropriations Subcommittee on Homeland Security.