Date: May 7th, 2025 1:39 AM
Author: https://imgur.com/a/o2g8xYK
Not sure if any recent studies have been done.
https://www.mpiwg-berlin.mpg.de/feature-story/taking-poo-samples-school-was-essential-part-south-koreas-modernization
"The school campaigns continued until the 1990s, but the main focus – a reduction in the baseline rate of parasite infection – began to show signs of impact almost immediately. In 1969, the rate of infection was enormously high, and for a diversity of parasites. These figures dropped rapidly, reaching single digits, in some cases, by the early 1990s.
But this “success” story was not without its tensions. Students from rural communities affected by parasites sought to evade the scrutiny of the state, often out of shame and embarrassment. In some cases, students skipped school on sample day, or substituted their pet’s sample to avoid personal scrutiny."
(http://www.autoadmit.com/thread.php?thread_id=5721387&forum_id=2Elisa#48910146)