Data confirms that over 90% of cases in the SC measles outbreak were in unvaccinated school-aged children, Dr. Bell said. That is why experts from MUSC Children’s Health urge the public to get vaccinated. Dr. Bell, the state’s epidemiologist, emphasized that declining vaccination rates destroyed herd immunity. Bell said vaccines are one of the most effective tools we have for protecting our communities. The doctor is clear as a bell about health parity while evenhandedly prom