FILE - This Aug. 29, 2009 photo shows village malaria worker Phoun Sokha, 47, showing his malaria medicine kit at O'treng village on the outskirts of Pailin, Cambodia. This spot on the Thai-Cambodian border is home to a form of malaria that keeps rendering one powerful drug after another useless. This time, scientists have confirmed the first signs of resistance to the only affordable treatment left in the global medicine cabinet for malaria: Artemisinin. U.S. experts are raising the alarm over the spread of drug-resistant malaria in several Southeast Asian countries, endangering major global gains in fighting the mosquito-borne disease that kills more than 600,000 people annually. The report warns that could be a health catastrophe in the making, as no alternative anti-malarial drug is on the horizon. (AP Photo/David Longstreath, File)WASHINGTON (AP) — U.S. specialists are raising the alarm over the spread of drug-resistant malaria in a couple of Southeast Asian nations, endangering major global positive aspects in preventing the mosquito-borne illness that kills more than 600,000 people once a year.