Why has Botswana declared a national health emergency?

Botswana's president Duma Boko, has declared a public health emergency as the country faces a shortage of essential medicines and medical equipment.Africa's defence chiefs discuss collective strategies and joint responses to insecurity in the continent. And why is the northern Nigerian state of Kano losing its famous yellow buses?Presenter: Audrey Brown Producers: Yvette Twagiramariya, Priya Sippy and Stefania Okereke in London with Ayuba Iliya in Lagos Technical producer: Jonathan Greer Senior Producer: Paul Bakibinga Editors: Maryam Abdallah, Andre Lombard and Alice Muthengi