Parents and students in Jurupa Valley could be dealing with a rare disease from the middle ages. Some parents refused to send their children to school Tuesday after receiving a warning from the Jurupa Unified School District about two possible cases of leprosy affecting students at Indian Hills Elementary School. At this time, it remains unclear if the students are related to each other. The director of disease control for Riverside County said a school nurse notified the health department of the rare disease on Friday.