That's one nurse for every 6,643 students. The ratio recommended by the American Nurses Association is 1 to 750.
Districts make do Wisconsin has never required that school districts employ a nurse at every school.
Many school districts have contracts with their county's public health department that allow a nurse to visit schools on occasion. The state law simply requires that a nurse help develop policies for emergency care. The district might also contract a nurse to help train staff to work with special needs children. It's up to each district to decide how much training a school employee needs to administer medications and handle emergencies. In Milwaukee Public Schools, their health training amounts to a half-day of class each year.