"What parasitic worms in defector reveal about conditions in North Korea:
A 2015 study of 169 defectors by Dankook University College of Medicine in South Korea found that out of the 17 female subjects who provided stool samples, seven had parasites."
cnn.com/2017/11/22/hea… "Choi Min-ho, a professor at Seoul National University College of Medicine who specializes in parasites, told CNN the use of human fertilizer on crops and poor sanitary conditions led to the transmission of parasitic cysts in North Korea." -@CNN