Cameron Fierro, 1, is vaccinated with the measles-mumps-rubella vaccine in Northridge, Calif.

The number of measles cases continues to grow beyond the initial outbreak tied to visitors to Disneyland in late December, health officials reported Friday.

As of Feb. 11, there were 110 cases of measles in California, 59 of which are related to the Disneyland outbreak, according to the state Department of Public Health.

The majority are in three Southern California counties — Orange, San Diego, and Los Angeles — but cases have also been confirmed farther north, including in Santa Clara, Marin, and San Mateo counties, officials reported.

Other confirmed cases connected to the California outbreak have been confirmed in six other states, including Arizona, Utah, Washington state, Nebraska, Oregon, Colorado, and Michigan.

Disneyland-related cases have also been reported in Mexico and Canada.

But measles cases that are unrelated to the Disneyland outbreak have also been popping up, particularly in the East. In all, 16 states were reporting confirmed cases as of Feb. 11.

The outbreak has prompted schools to take precautions, including sending home students who have not been vaccinated against the highly contagious virus. But it has also fueled concern among parents and reignited the debate over how unvaccinated students should be treated.

About 91% of California children have received the measles vaccine, according to the state department of health's most recent survey. Vaccines are required to attend public school, though parents may file for an exemption for personal or religious reasons.

That has led to mass stay-at-home orders for students who can't immediately prove immunity to the highly contagious virus as school districts try to prevent its spread, particularly among those who were never vaccinated.

At Palm Desert high School alone, 66 students who have not been fully vaccinated for measles were sent home for two weeks.

After a Huntington Beach student contracted measles, 24 classmates who couldn't provide proof of immunization were asked to stay home for three weeks.