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Mary Peterson of Des Moines, Washington, doesn't believe the vaccine for the novel H1N1 flu has been studied enough to get it for herself and her daughters, who are 1 and 3 years old.

"I wrestled with it," she said. "I think the side of caution in this case is just waiting until we have more information."

Peterson is one of many parents who are discussing -- whether in real life or on Twitter -- their skepticism of the vaccine. The vaccine is being distributed as an intranasal spray this week, and will arrive next week in injection form, said Dr. Thomas Frieden, director of the Centers for Disease Control and Prevention, earlier this week.

The CDC and other public health authorities say the new vaccine is safe, and are encouraging everyone to get it, especially those in high risk groups. But experts acknowledge that many people struggle with the decision. Take a quiz about H1N1 flu

"I bet half the people in the country have concerns," Dr. Mehmet Oz, host of the "Dr. Oz Show" and professor of surgery at Columbia University, told CNN's Anderson Cooper earlier this week. Read full article »

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