At least 153 unvaccinated students at two northern South Carolina schools exposed to measles are being quarantined for 21 days, state health officials said.

The children in South Carolina were unvaccinated, as were many of the 1,563 people infected in the US this year.

At least 153 unvaccinated students at two northern South Carolina schools exposed to measles are being quarantined for 21 days, state health officials said.

The outbreak includes at least seven confirmed cases, but some are clearly being missed.