The health department said they are taking all precautionary measures to prevent the disease from spreading.
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The revelation that the ongoing measles outbreak is tied to a foreign individual does not come as a surprise to those who have studied the disease.
Texas officials urge vaccinations for the contagious virus.
A sign prohibiting all children under 12 and unvaccinated adults stands at the entrance to PeaceHealth Southwest Medical Center in Vancouver, Wash., Jan. 25, 2019.
Across the US, 10 states - California, Colorado, Connecticut, Georgia, Illinois, New Jersey, New York, Oregon, Texas and Washington - reported 79 confirmed measles cases in January, according to the Centers for Disease Control and Prevention.
"These outbreaks are associated with travelers who brought measles back from Israel and Ukraine, where large measles outbreaks are occurring", the CDC says.
"While this is a relatively small number of cases, it's a good time to make sure you and your children have gotten the recommended two doses of measles vaccine", Van Deusen said.
Rita Espinoza, the chief epidemiologist at Metro Health, said health care providers, emergency rooms and school districts are among those that need to remain vigilant, even though Bexar County has not seen a case of measles since 2007. Officials also warned last week of an infected patient who had visited Bend, Oregon, and may have exposed others to the virus there.
In Clark County, 34 of the cases were among children age 10 or younger, while just two were among patients older than 18. Health officials say the case is part of the cluster in the region. The Oregon Health Authority said a Multnomah County resident had been diagnosed with measles January 25.
While the majority of children in Donegal still receive the MMR vaccine, the numbers have been dropping slightly over the past few years.
Measles symptoms include a fever, a dry cough, a runny nose, a sore throat and inflamed eyes.
In 2018 the World Health Organization (WHO) blamed the anti-vaccination movement for a surge in European measles cases.