State health officials have determined stress likely caused a dozen female high school students to suddenly experience tics and other neurological symptoms associated with Tourette Syndrome, they said on Friday, Reuters reports. The Le Roy Central School District, about 50 miles east of Buffalo, scrambled to conduct environmental testing for air quality and mold after 12 students developed tics and impulsive verbal behavior over the course of the last three months.

But state health investigators ruled out environmental factors, latent side-effects from drugs or vaccines like Guardasil, trauma or genetic factors. The girls were all treated by doctors and most are improving, school officials said…

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