JOHANNESBURG — A South African foundation says retired archbishop Desmond Tutu has checked into a Cape Town hospital for treatment of a persistent infection.

The Desmond and Leah Tutu Legacy Foundation said the Nobel Peace Prize laureate will undergo tests to discover the cause of the infection.

The foundation says 81-year-old Tutu spent Wednesday morning in his office before going to the hospital and was in good spirits. It says the non-surgical treatment is expected to take five days.

Tutu was a vigorous campaigner against the system of white racist rule known as apartheid, which ended when democratic elections were held in 1994.