Measles at school

We are supposed to go to school until Friday this week but now school has been canceled for three days. One of our students has come down with a case of measles. Our school building is old and doesn't have good ventilation in the classrooms, so I can understand canceling classes. I guess that the US and Japan both stopped requiring children to be get a measles shot before starting school. Now we are seeing that it was not a good idea. I have to go back to school on Friday but it feels like I'm already on summer vacation.