evidence: The Chicago Department of Public Health has reported that 10 of those 12 confirmed cases are among migrants who are living in a shelter in the city's Pilsen neighborhood. Six cases are in adults. Six are in children. Two of those children are Chicago Public School students. Unlike other students, CPS students who are migrants are not required to be vaccinated to attend school, and that's because there's an exemption for children who are living in unstable housing.