The United States is facing its second surge in measles cases. Large outbreaks in Utah, Arizona and South Carolina are continuing to grow. CNN is tracking the cases.

Texas this year has been the center of the nation's largest measles outbreak in more than two decades, as a mostly eradicated disease has sickened more than 700 in the state, sent dozens to hospitals and led to the death of two unvaccinated children.

Spartanburg's 'accelerating' measles outbreak has surpassed 100 cases. The underlying causes go beyond simple exposure into culture and experiences

Health experts said the nationwide spike in measles cases is likely fueled by falling vaccination rates and more international travel.

The state Department of Public Health says an unvaccinated child under the age of 10 in Fairfield County contracted the virus after traveling internationally.