In pictures: President Muhammadu Buhari receives Bill Gates and Aliko Dangote

R-L: President Muhammadu Buhari; Chairman Bill And Melinda Gates Foundation, Mr Bill Gates; President Dangote Group, Alhaji Aliko Dangote; President Global Development of Bill and Melinda Gates Foundation, Mr Christopher J. Elias and Director Africa Team, Global Policy and Amp; Advocacy Of Bill And Melinda Gates Foundation, Mr Ayo Ayaji, during an audience with Bill Gates and Alhaji Aliko Dangote at the State House In Abuja. Photo; Sunday Aghaeze

R-L. President Muhammadu Buhari, Mr Bill Gates, Alhaji Aliko Dangote, and Ms Halima Dangote

R-l. Minister Of Health Prof Isaac Adewole, President Dangote Group, Alhaji Aliko Dangote, President Muhammadu Buhari And Chairman Bill And Melinda Gates Foundation, Mr Bill Gates and Ms Halima Dangote

R-l. Alhaji Aliko Dangote, President Muhammadu Buhari, Mr Bill Gates, Mr Christopher J. Elias