Johannesburg, South Africa (CNN) -- Former President Nelson Mandela has been discharged from a hospital and will continue receiving treatment at his home in Houghton, a spokesman for South African President Jacob Zuma told CNN on Wednesday.

Mandela, 94, was treated for an acute respiratory infection in 2011. He was hospitalized for a lung infection on December 8; and on December 15, he underwent surgery for removal of gallstones.