People hang around outside of a migrant shelter Wednesday, March 13, 2024, in the Pilsen neighborhood of Chicago. Multiple people living at the shelter for migrants have tested positive for measles since last week. A team from the Centers for Disease Control and Prevention is supporting local officials' response. (AP Photo/Erin Hooley)
FILE - Immigrants stand outside a shelter in the Pilsen neighborhood of Chicago, Dec. 19, 2023. Officials have confirmed seven cases of measles among shelter residents since Thursday, March 7, 2024, prompting a push to boost vaccinations with support from the Centers for Disease Control and Prevention. (AP Photo/Charles Rex Arbogast, File)
Children cover their heads as they sit outside of a migrant shelter Wednesday, March 13, 2024, in the Pilsen neighborhood of Chicago. Multiple people living at the shelter for migrants have tested positive for measles since last week. A team from the Centers for Disease Control and Prevention is supporting local officials' response. (AP Photo/Erin Hooley)