South Carolina's public health agency is offering free measles, mumps, and rubella vaccines at mobile vaccine clinics in Spartanburg County as the state experiences an outbreak of measles with 16 cases reported this year, the highest number since the disease was eradicated over two decades ago. All 16 people were unvaccinated, and health officials are urging unvaccinated patrons of a Greenville gym that offers day care for customers that they may have been exposed. The two-dose vaccine provides lifelong immunity to nearly all who receive it, and side effects are possible, but complications from the disease far outweigh any rare adverse events associated with the vaccine.