600 Zionsville High School students may be headed to emergency vaccination clinics as a chickenpox outbreak spreads through the student body. If they don't get the vaccine or can't prove they've received the necessary shots, they won't be allowed back into school Monday.

"There have been nine children diagnosed with chicken pox that's a high number," said Dr. Gregory Larkin, state health commissioner.

"The nine could easily become hundreds."

Zionsville records show many students don't have chickenpox immunizations required by state law.

"We have sent out numerous warnings to parents to get children immunized," said Scott Robison, school superintendent.  

A wave of 328 students won't be allowed to participate in weekend football, band and other activities if they don't get the shot or prove they've gotten it. The first emergency clinic begins at 6 p.m. in the cafeteria at Zionsville High School.

There will be a second clinic Monday at the school.

Chickenpox can become serious and lead to shingles. Most teenagers though will contract the virus and recover after an incubation period for chickenpox only. Students who get the pox have to stay home for 21 days required by schools.