JANESVILLE, Wis. -- A shortage of H1N1 flu vaccine has forced the cancellation of flu shot clinics in the Janesville School District.

This week's clinics are called off because school-age children don't fall in the revised high-risk category.

"We are at the mercy of the suppliers in regards to when we'll get a lot more vaccine," said Deb Erickson of the Rock County Health Department. "But the state has been telling us that they're expecting more to come in the next two to four weeks."

The Rock County Health Department will now hold clinics at two health department offices, and Saturday at the Rock County Job Center.

Future clinics at Janesville schools are still on the calendar, officials said.