"I got the nasal spray, it wasn't hard, just took a second," said seventh grader Alana Jing.
Dr. Andy Lubell, the medical director of the schools says just this week there's been a jump in the number of H1N1 cases.
In fact, last night the Children's Hospital of Philadelphia.added staff to accommodate more kids coming in with flu symptoms.
That's why doctors say it's important to vaccinate, especially high-risk people including school-aged kids, people with medical problems, and pregnant women.
That's why teacher Silke Susanin got the shot. She's expecting her first child soon.
"We're saving two lives by getting the vaccine so it's really important," she said.
As for safety concerns, Dr. Lubell says it's a misconception that the vaccine was not thoroughly tested.
"It was produced in the same manner we produce the seasonal flu vaccine and certainly the CDC is on top of making sure the vaccine is safe for the kids were giving it to."
Even if the H1N1 virus has spread at your child's school, doctors say it is not too late for the vaccine. The virus is expected to keep circulating over the next few months, and even years.