A mysterious illness causing an odd "twitching" symptom has stricken several students and a staff member at a Virginia high school. 

Testing continues at William Byrd High School in Roanoke County where students and staff have shown strange symptoms of twitching and spasms since September, but a cause has yet to be determined.

About 30 students staged a walkout and protest earlier this week, and the school has said about 300 of the school's 1,200 students have been absent.

School officials say they do not plan to close the school.

Roanoke County school officials and health officials have found no environmental cause for the symptoms, which have affected fewer than 10 students, the Associated Press reported.

"I have seen them in the hallway, and it seems pretty bad," said senior Charlie Wallace, told the Roanoke Times. "It's uncontrollable. Twitching, that's the only way you can describe it."

Students and parents met Monday night with officials from the school system, the Virginia Department of Health and the companies conducting the environmental tests.

Read the rest at: Fox News

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