Martin Edlund : Le problème est que Rate of death among children under 5 has been cut in half , he says . It threatens 3.4 billion people -- roughly half the globe -- and is a leading cause of school and work absenteeism in sub-Saharan Africa . Edlund says new diagnostic and treatment options are key weapons in the fight . He says stepped-up American aid , from Bush and Obama , has played a key role .
Martin Edlund : Le problème est que Rate of death among children under 5 has been cut in half , he says . Edlund says new diagnostic and treatment options are key weapons in the fight . He says stepped-up American aid , from Bush and Obama , has played a key role .