Health

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t least three of the cases appear to have been caused from exposure to a sick family member, the school district told parents in an online update Wednesday.

"This type of person-to-person transmission occurs when an ill person does not wash hands thoroughly after using the bathroom and may have been a contributing factor for illness transmission among the students at the school," wrote Bill Briscoe, the district's assistant to the superintendent for administration and operations.

Galena Elementary has remained open since the first infection on September 21, and officials say it has been cleaned regularly.

"We've taken precautions," Rarick said. "I'm a parent. I understand those concerns."

In addition to the 10 confirmed cases this week, health officials were still waiting on lab results for some other suspected infections.