As seen in an Associated Press article.

The Houston school district is temporarily relocating students and teachers from a middle school where more than 22 staff members have fallen ill in the last four weeks, a school official said Wednesday.

District officials plan an "invasive systems study" of Francis Scott Key Middle School to determine whether air quality issues are to blame for the severe headaches, chest pains, breathing problems and vomiting suffered by at least 15 teachers and seven janitors since school began Aug. 27. Some parents have said their children are ill and have refused to send them to school.

Experts hired by the district and the teachers' union have so far found nothing wrong with the air quality, although at least two forms of mold were detected.

The district has not determined where or when the planned relocation will take place, district spokesman Terry Abbott said.

"The health and well being of staff and students remains our top concern," Abbott said in a statement.

The school with 600 students is in a working-class neighborhood where 95 percent of the students are eligible for free or reduced lunch.

The symptoms include watery eyes, shortness of breath, elevated blood pressure, skin rashes and vomiting, Gayle Fallon, president of the Houston Federation of Teachers, has said.