Former South African President Nelson Mandela has spent a second night in hospital where he is being treated for a lung infection. Doctors say there has been little change and his condition continues to be described as serious but stable, reported BBC. Mr Mandela, 94, had been ill for some days before being taken to a Pretoria hospital early on Saturday. It is the third time this year he has been admitted to hospital. Mr Mandela's wife, Graca Machel, cancelled a scheduled appearance in London to remain at her husband's bedside. Former South African President Nelson Mandela has spent a second night in hospital where he is being treated for a lung infection. Doctors say there has been little change and his condition continues to be described as serious but stable. Mr Mandela, 94, had been ill for some days before being taken to a Pretoria hospital early on Saturday. It is the third time this year he has been admitted to hospital. Mr Mandela's wife, Graca Machel, cancelled a scheduled appearance in London to remain at her husband's bedside.