DENVER--- -- U.S. Secretary of Health & Human Services Kathleen Sebelius said the average age affected by the H1N1 flu is 15 years of age.

Colorado saw two schools shutdown in the spring following H1N1 outbreaks.

Which is why officials said they would urge parents to get their kids vaccinated.

A vaccination is undergoing clinical trials and if it passes could hit the shelves by mid-October.

The testing window has been a short one which is causing some concerns among parents.

Dr. Robin Larabee, a Denver pediatrician, said it is a compressed testing period but said parents should have no reason to worry.

"The manufacturing process they use for the regular flu vaccine is a tested and true process. So, instead of putting in purple die last year, we are putting in pink die and otherwise its all the same," said Larabee.

Larabee said she would recommend the vaccination to her patients.

Despite positive feedback from medical professionals we spoke with, parents still said they were leary about vaccines in general and said they would not vaccinate their kids. They said they had little concern about the threat of H1N1 to their kids.

"I actually haven’t given any of my kids vaccines to date and I am probably not going to," said Kimberly Trowell.

Local health departments said they are still waiting on official word from the government about how many vaccines they would receive and how they would be distributed.

They said they are in touch with local schools and said the vaccine would likely be free with the exception of an administrative fee.