SC Dept of Public Health said a measles outbreak centered in Spartanburg County has sickened at least 126 people, put about 303 residents in quarantine and forced quarantine or isolation at more than a dozen schools.State epidemiologist Linda Bell and parents including Marissa Grush and Natalie Shamblen said low immunization rates, vaccine resistance amplified by Robert F. Kennedy Jr. and pandemic-era distrust have complicated containment and led some families to accelerate MMR vaccination for infants.