Little by little, sickness, fear, and police harassment are whittling down the group of thousands of migrants making their way to the U.S. border.

Little by little, sickness, fear, and police harassment are whittling down the group of thousands of migrants making their way to the U.S. border. https://t.co/JWFyEUPTcp

— CNBC (@CNBC) October 25, 2018