Bio-terrorism could kill 30 million people in a year, says Bill Gates – video

Bill Gates, the co-founder of Microsoft who has spent billions on philanthropic efforts over the past several decades, speaks at the Munich security conference on Sunday and says that the world must be on guard for bio-terrorism attacks. Telling the audience that "a synthetic version of the smallpox virus ... or a super contagious and deadly strain of the flu" could kill more than 30 million people in a year, Gates says there is a "reasonable probability" that such an event could occur in the next 10 to 15 years

• Bill Gates warns tens of millions could be killed by bio-terrorism