Bill Gates gives a child a rotavirus vaccine against diarrhea at the Ahentia Health Centre, in Awutu Senya district, in the Central Region of Ghana, on March 26, 2013. The Bill and Melinda Gates Foundation supports the GAVI Alliance, which increases access to vaccines around the world. With GAVI support, Haiti anticipates that it will roll out the rotavirus vaccine this summer. AFP PHOTO/PUIS UTOMI EKPEI