<sod >In front of an audience expected to include Microsoft founder, philanthropist and anti-malaria campaigner Bill Gates, she is also expected to urge leaders from the blocâs 53 nations to work to halve the number of those afflicted by 2023.< eod>< sod > In front of an audience includingÂ Microsoft founder, philanthropist and anti-malaria campaigner Bill Gates, Ms MayÂ also urgedÂ leaders from the blocâs 53 nations to work to halve the number of those afflicted by 2023.< eod>