JOHANNESBURG — Former South African president Nelson Mandela, 94, received a visit in hospital from current leader Jacob Zuma on Thursday, who said the anti-apartheid hero was making “continuous improvement” under treatment for pneumonia. “Madiba is stable and we are thankful that he is responding well to treatment and that he is much better,” Zuma said, referring to Mandela by his clan name. Mandela has spent just over a week in hospital. This is the third health scare in four months for the Nobel Peace Prize laureate, who became South Africa's first black president in 1994 and was hailed as a global symbol of tolerance and harmony. He was in hospital briefly in early March for a check-up and was hospitalized in December for nearly three weeks with a lung infection and after surgery to remove gallstones. — Reuters