Sixteen-year-old Cassie Li Pui-ying was rushed into an emergency operation in Hong Kong on Monday morning after days of persistent fever and severe abdominal swelling. Doctors discovered a ruptured section of her colon and extensive inflammation inside her abdomen. The five-hour procedure saved her life, and she now remains in the intensive care unit under close monitoring. Her mother, Marine Mak, remembers the shock that morning. “When the doctor called me to the operating floor, my heart...