Michel Sidibé, Executive Director of UNAIDS, has the storyteller's persuasive powers. He recounts a turning point in his life, when he had been charged with responsibility by UNICEF for promoting immunisation in Zaire, now the Democratic Republic of Congo (DRC).

A study in the United States has found that people living with HIV aged 45 to 65, who start treatment with low CD4 counts – a measure of how healthy the immune system
is – have higher mortality rates than their younger counterparts.