"I was scared. I was really nervous," he now admits.

Amalia, 11, and Brooklyn, 8, missed more than a week of school. At one time they both had high fevers.

"They had 103 to 104 for multiple days," he said. "They were down for the count."

That was three weeks ago. On Sunday, the two girls were clearly back to their old selves as they enjoyed the afternoon with dozens of other kids inside the Children's Museum of Denver.

Reminders of the ongoing flu season are everywhere however. Hand sanitizer stations are around every corner inside the museum.

"Safety and cleanliness are always out number one concern," Zoe Ocampo, the manager of marketing for the Children's Museum, explained. "It's just a matter of taking all of the precautions you can."

Ocampo says it is clear that almost every parent is at least moderately worried about the flu this year.

Doctor Eric France is with Kaiser Permanente and says it is understandable parents are finding themselves "freaked out" when H1N1 comes into the home.

He is not surprised to see some schools and daycares with 30 percent infection rates.

France also said, "Adults probably have a 15 to 25 percent risk of catching H1N1 this year. It's going to be higher if you have kids."

Just because H1N1 has entered your home, France says it is not a guarantee that everyone will eventually become sick.

"Not everyone is going to get ill. Typically we hear stories that one person has it; then in family of five, maybe three people get it, and two people don't," he said.

France says the youngest child in the home appears to be the most vulnerable to getting sick with the virus.

"I often tell my patients that the youngest baby is probably most at risk when there are older kids in the home," he said.

He also says older people continue to show some generalized signs of immunity. People born before 1957, he says, appear to have some sort of immunity from H1N1.

Research also shows that people in their 20s and 30s are falling ill to H1N1 at a much higher rate than they would fall ill to the regular, seasonal flu.

France says it is likely that many people are contagious for at least 24 hours before they first start feeling sick. In addition, the Centers for Disease Control recommends people stay home from work or school until they have gone 24 hours without a temperature of 100 degrees or higher.

Stubby has yet to get sick.

"I was like, 'OK, when are my hands going to get clammy and when are my hands going to get sweaty?' So far I haven't had any symptoms," he said.

The Centers for Disease Control has issued a number of recommendations for people worried about H1N1. To learn more visit: http://www.cdc.gov/H1N1flu/qa.htm.