Posted on July 23rd, 2012 by
The number of cases rising at an epidemic rate. Nearly 18,000 cases have been reported so far. Mayo Clinic Health System Mankato's Jessica Sheehy says the original vaccine had more side effects, but the new vaccine isn't as strong. Sheehy says, "so the immunity people are getting from the vaccine isn't lasting into adulthood so the adults are really be carriers of this disease."
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