The first wave of the H1N1 vaccine is crossing the country this week-- and it's accompanied by fear.
Not only are Americans afraid of catching the swine flu virus, but many are also skeptical of the shot meant to prevent it.
A recent Associated Press Poll showed more than one-third of parents don't want their kids to be vaccinated, saying the shot is too risky.
"One wonders if there is a rush to administer a vaccine that has yet to prove its efficiency," said Dr. Michel Cohen of Tribeca Pediatrics.
Still, federal health officials are pushing the vaccine and promising to track its side effects.
"Taking the chance that you or your roommate or your child may be one of those rare but serious cases, may have an underlying impact. may expose someone else," said Health and Human Services Secretary Kathleen Sebelius.
The government says the swine flu vaccine is made the same way as the seasonal flu vaccine, and so far, no scary side effects have shown up in tests, including those on children.