Health officials said four residents were "exposed to an unimmunized, international visitor who was infectious with measles."
Seattle families were notified of changes to school policy. To attend school, students must be fully vaccinated, in the process of doing so, or have a signed Certificate of Exemption.
Recent reports of people infected with measles visiting five different U.S. airports have prompted fears of potential outbreaks in multiple regions of the country.
Austin Public Health is working with health departments in Central Texas to tell people what kind of risk of exposure to the disease there has been.
The film features disgraced former doctor Andrew Wakefield.
Children make up most of the 110,000 people estimated to have died from the virus in 2017, according to the U.N. body.
The parents of children killed by illnesses related to vaccines described how anti-vaxxers would share news of the deaths and send the families taunting messages on social media platforms. One mother said she believes the attacks are designed to keep parents from becoming pro-vaccine campaigners.
"A philosophical or personal objection may not be used to exempt a child from the measles, mumps, and rubella vaccine," Washington State House Bill 1638 reads.
Mumps, which the MMR vaccine can prevent, can cause complications, including brain swelling and meningitis.
"Measles can result in death or severe disability, and the measles vaccine is very safe," an immunology specialist told Newsweek.
The first weeks of a baby's life is the worst possible moment for parents to start discussions about childhood immunizations. Yet, this is exactly what happens in most settings.
The percentage of American children under two years of age who have received no vaccinations has quadrupled since 2001.
Cases were reported in Williamsburg and Borough Park, in children between 7 months and 4 years of age.
Foreign powers have "weaponized" the debate surrounding health care, according to experts.
The man behind the anti-vaccine craze is mad as hell, and still convinced he's right.