The 91-year-old entertainer was admitted late on Friday, and doctors "decided to keep him in over the weekend for observation and to make sure the drugs they put him on agree with him," publicist Candi Cazau told Reuters.

Cazau said she was told that the antibiotics administered to Lewis were "doing their job, and he's feeling better."

She added that he was expected to be discharged from the hospital on Sunday or Monday and was otherwise in relatively good health.

A longtime Las Vegas resident, Lewis had been beset for many years with various ailments, including heart attacks, an inflammatory lung disorder and chronic back pain.