Officials scramble to contain measles

Measles outbreaks in New York and Washington state have public health officials scrambling to contain a disease that was eliminated in the United States nearly two decades ago.

Washington state has declared a public emergency in an outbreak in Clark County that has infected at least 53 people, mostly children. An additional four cases have been confirmed in neighboring Multnomah County, Oregon. Another case has been identified in King County, which includes Seattle.

Clark County public health officials have long feared a measles outbreak could spread rapidly given the county’s cluster of unvaccinated children.

Nearly one in four Clark County kindergarten students during the 2017-18 school year did not get all their immunizations, according to data from the Washington Department of Health. At three schools in the county, more than 40 percent of kindergartners did not receive all recommended shots before starting school.

“When you have large numbers of unimmunized people and you introduce measles into that population, it’s like putting a lighted match into a can of gasoline,” said Alan Melnick, Clark County’s public health director.

In general, Melnick said, public health departments want to immunize up to 95 percent of the population against measles to create herd immunity. Such widespread vaccination protects against the highly contagious virus, which can be spread through the air. It also protects people who are unable to get vaccinated because they have other medical conditions.

State laws generally require parents of school-age children to show proof of immunization or claim an exemption before beginning school.

All but three states – California, Mississippi and West Virginia – allow parents to reject vaccinations for nonmedical reasons, such as religious or personal beliefs, according to the National Conference of State Legislatures.

The risk is when there are large numbers of children in a single setting, such as a school or a church, who are not vaccinated.

“You need a high enough vaccination rate to prevent measles from spreading,” Melnick said.

The Centers for Disease Control and Prevention has reported 79 cases of measles in the United States. Beyond Washington and Oregon, cases have been reported in California, Colorado, Connecticut, Georgia, Illinois, New Jersey, New York and Texas.