Thousands of migrants from Venezuela and other countries are stranded in southern Mexico, forbidden to travel or work, but lacking the papers or money to go back to their home countries.

Dr. Hector Ocaranza knew El Paso would see measles the moment it began spreading in West Texas and eastern New Mexico.

North America’s three biggest measles outbreaks continue to balloon, with more than 2,500 known cases; three people have died in the U.S. and one in Mexico ... North and South American countries ...