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I think schools should remain open as long as possible. If you have 30 percent of your students absent, however, you should look at a possible closing. I would be more concerned if you don't have enough teachers.
I live and work in an area where the school includes students from who live up to 25 miles from school. And due to the recession, our schools are having to cut back on the custodial staff to save money. I believe the schools should stay open as long as possible. But often students don't admit that they are sick when they leave for school or else start to show symptoms after they have been at school for awhile. Our teachers are extremely dedicated and it takes a lot for them to be willing to stay at home when they are sick.
Schools should close if they have several students and/or staff who may be showing symptoms of the disease or else have been confirmed as having it. These days, the schools are not cleaned as well as they used (desks are not sanitized regularly, lockers are not cleaned, etc.) It would take our staff several days to disinfect school buildings and they are also at risk for the disease, though not to the extent that the rest of the school may be. To help keep the disease in check and from spreading to the other outlying areas that attend our school, there needs to be a limit as to the number of students and staff who have the flue before school is closed. I don't think it necessarily needs to be one student and then close the school. If you have at least a dozen cases throughout the district, then I think the decision should be made to close the schools. With our cold weather and close conditions in school, it wouldn't take it long to infect most of the students and staff in the buildings.
The schools themselves should remain open. The kids, and their immediate families, should stay away until no longer contagious.