ebMONROVIA, Liberia — The rate of new Ebola infections here has declined so sharply in recent weeks that even some of the busiest treatment facilities are now only half-full and officials are reassessing the scale of the response needed to quell the epidemic. The turnaround has occurred without the provision of a single treatment bed by the U.S. military, which has promised to build 17 Ebola facilities containing 100 beds each across Liberia. Those treatment units will be constructed, said Bill Berger, head of the U.S. Agency for International Development’s Disaster Assistance Response Team here. But the option of initially opening some with as few as 10 beds is “being discussed,” he said. More