RAVENNA, Neb. (AP) — So many students and staffers have called in sick that school’s been canceled in the central Nebraska city of Ravenna (ruh-VA’-nuh).

Officials say 15 of 70 staff members and 100 of 460 students called in sick Thursday.

There will no school for four days in a row. The district called off classes for Friday, to be followed by the weekend and the Martin Luther King Jr. Day holiday on Monday.

Superintendent Dwaine Uttecht says flu is the primary illness going around.