They went into full infection lockdown mode. The patients were evacuated on stretchers and gagged while "Patient Zero" got the body bag treatment. The rest of the village was given a thorough examination—and we mean thorough.
Cultural Snack: Dr. Kwang mentions a woman who had "tiny feet that had to have been bound when she was a girl" (2.1.23). Back in the day, small feet were considered a mark of womanly beauty (like tiny waists in Western countries). So, young girls would have their feet bound tightly to prevent further growth. In many cases, the feet were even broken. The first ban on the practice came in 1912, and the Communist party added further bans in 1949 (source).
Dr. Kwang realized that Dr. Keui tried to warn him. He remembered a time when the two were medical personnel on the frontline. They were trying to remove shrapnel from some poor kid's intestines. Meanwhile, bombs were going off over their bunker.