(WHDH) — At least eleven school districts have closed in Texas due to a flu outbreak.

Each school that closed had at least 20% of their student population call out sick on Wednesday.

Gunter School District said they had 253 of their students out sick, which is about 30% of their student population.

A superintendent said closing the district was necessary to stop the outbreak. Gunter School District is taking a week off to deep clean all of their facilities.

School nurses said several students had their flu vaccine, but officials say it is only expected to be about 10% effective this season.

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