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.
"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.
"Be knowledgeable, though, that the H1N1 swine flu vaccine is built on a chassis of the older original seasonal vaccine. So, it should have similar risks, which have proven to be very low," he said.
Priority groups for the vaccine include pregnant women, caregivers and household contacts of children younger than 6 months, people between the ages of 6 months and 24 years, and anyone ages 25 to 64 with existing health problems, according to the CDC.
Some have voiced concerns about mercury in some of the new vaccine varieties. Thimerosal, a mercury preservative found in the multi-dose vial H1N1 vaccines, has been controversially linked to autism, though no studies have proved that theory. But the CDC says there is no evidence that thimerosal is harmful to pregnant women or fetuses. Vaccine companies are making vaccine types for both seasonal flu and H1N1 flu without this mercury-based preservative.
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