Malaria is still a deadly disease in many parts of the world. I once heard a talk given by the Medical Director of the UNC Hospital in Chapel Hill. One of the case studies that he told us about was a man from a small hospital in eastern NC who had not been properly diagnosed before he was "shipped out" to their hospital where he later died. The man had just returned from working in Africa and had not bothered to take his antimalarial preventative. The doctor said that anyone who has visited a country in the "malarial belt" who did not take the preventative should be assumed to have malaria unless they test negative for the disease.
One reason for the concern is that members of the military who know that they are going to be deployed to an area where malaria is common start to take their antimalarial drugs several weeks before they leave. Obama in sending our military into harm's way to help with the Ebola epidemic would not know enough to consider that advance notice is needed for such a deployment.
By the way, the reason malaria is STILL a problem for much of the world - Rachel Carson's demonization of DDT in The Silent Spring back in the early sixties.