now on bbc news, it's hardtalk with zeinab badawi. welcome to hardtalk with me, zeinab badawi. my guest is one of the most brilliant scientists in the world, and he's african. his ground—breaking research is helping tackle diseases that kill thousands every year. cameroonian—born professor christian happi gave up a successful career at harvard university in the united states and moved back to africa. he's setting up a world—class laboratory in nigeria, which will have a pandemic early detection system. he believes africa could become a global centre of knowledge about infectious diseases such as covid. how realistic is his vision? professor christian happi in ibadan, southern nigeria, welcome to hardtalk. how worried are you about the third wave of covid in africa? we've seen some countries are quite badly affected, such as south africa. thank you. i'm very concerned about a tidal wave of covid in africa. we've seen countries like south africa, uganda, kenya, liberia, sierra leone, as i'm speaking now, the number of cases are up over 1,000—fold in each of these countries. and i