Johns Hopkins University yekuAmerica , iyo iri kutevera kupararira kwechirwere ichi inoti pasi rose vanhu vabatwa nechirwere ichi vadarika mamiriyoni gumi namashanu nezviuru mazana mashanu kana kuti 15.5 million , kuchitiwo vafa vadarika zviuru mazana matanhatu nemakumi matatu ane zvina kana kuti 634 000 .