Sydney Lupkin, journalist for MedPage Today and VICE News, recently returned from a weeklong reporting fellowship in Cambodia and Thailand. She filed this report on the fight against malaria in Southeast Asia. Hours outside Cambodia's bustling Phnom Penh, the Ponhea Krek District feels like a different world. Rubber tree plantations line the narrow roads between towns, and Steung Market holds dozens of tiny open storefronts that stand doorless and without air conditioning in the 100-degree heat. Rung Bunkok's patients sit on red plastic chairs outside his office as they wait their turn to see him.
Po Theam, a 29-year-old logger who lives 20 kilometers away, arrived on the back of his brother's motorcycle. He said he tested positive for malaria last month, but he wasn't sure what drugs he took and he stopped taking them once he felt better. His skin glistened. He said he was "hot in…