Kids with underlying medical conditions can receive a free H1N1 vaccine at Henry Clay High School, 2100 Fontaine Road, Saturday from 9 a.m. to 3 p.m. or until the vaccine runs out.

About 3,000 doses of vaccine will be available at the clinic. Long lines have formed at clinics in some parts of the country. Kevin Hall, health department spokesman, said it's hard to predict how many people will show up.

"We could have 2,000, we could have 6,000," he said.

The clinic was set up to serve children with chronic medical conditions such as diabetes, neurological disorders and severe asthma who are at high risk for catching H1N1.

"If you don't fall into this category don't show up expecting a shot," said Hall.

The original location was Lafayette High School, but the clinic was moved because of a scheduling conflict.

The shots being given on Saturday will contain trace amounts of the preservative thimerosol. Some parents have expressed concern about the safety of vaccinating children with doses containing the preservative. Hall said the shots only contain trace amounts of the preservative.

A thimerosol-free H1N1 vaccine is available but is very limited in supply. It is currently being giving only to pregnant women and those with mercury allergies, Hall said. The health department does not have thimerosol-free vaccine at this time and it will not be available at Saturday's clinic.

Eight other clinics are scheduled in Fayette County through November and December.