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In 2018, European countries reported more than 83,500 measles cases, including 74 deaths, according to the World Health Organization (WHO). A majority of cases were in the Ukraine, but Serbia, France, Italy, Greece, the Russian Federation and Georgia were all hard-hit as well.
And in just the first two months of this year, WHO said, more than 34,300 measles cases were reported across the European region.
The agency has long encouraged international travelers to have all necessary immunizations before taking off.
But, Angelo noted, people often think of Europe as a "low-risk destination" when it comes to infectious disease -- and they may not think to plan a pre-travel health care visit.
So the CDC is "reinforcing" its recommendations to Europe-bound travelers, she said.
But if they are traveling, the advice is different, the CDC explained.
In that case, babies 6 to 11 months old should get a single MMR dose. Meanwhile, youngsters ages 12 months and up should get two doses, separated by 28 days -- if they have not yet received the standard MMR shots.
As for adults, make sure you have evidence of immunity against measles before traveling, the CDC recommends. That can include written documentation of adequate vaccination, a blood test showing immunity, or your age: People born before 1957 are presumed to be immune because they were probably naturally exposed to measles during outbreaks.
You don't necessarily need to dig through your attic looking for the medical record. States often maintain vaccination records, Angelo noted, and you or your health care provider may be able to access the information that way.
If there's no evidence of presumed immunity, the CDC recommends getting the MMR.
The agency lays out its advice in the July issue of Pediatrics.
Dr. Paul Offit, a vaccine expert not involved in the report, agreed that its message is timely.
"Most people don't consider a trip to Western Europe as one in which they might be exposed to a potentially fatal infectious disease," said Offit, who directs the Vaccine Education Center at Children's Hospital of Philadelphia.
"But measles is common in several popular tourist destinations, like Italy and France," he said. "Travelers need to make sure they are up to date on their measles vaccine before getting off the plane."
Why are outbreaks hitting those countries? Low vaccination rates, the CDC says. In some European populations or communities, vaccination rates are below 70%. That's owing to a mix of factors -- from parents' worries about vaccine safety, to religious or cultural beliefs, to regional instability in certain countries, according to the report.
In the United States, Angelo said, most measles cases are related to international travel. Unvaccinated travelers can not only get sick -- but may also bring the infection back with them, potentially spreading it to others who have not been vaccinated.
Measles was considered eliminated in the United States in 2000. But so far this year, the CDC has received reports of 1,044 measles cases nationwide -- the most since 1992. Those cases have been confirmed in 28 states.
According to Angelo, it all underscores the importance of keeping all kids up-to-date on the MMR -- not only those who will be traveling.
Measles is a highly contagious virus, spread through the air when an infected person coughs or sneezes. The symptoms include a high fever, cough and runny nose; the telltale rash appears three to five days after the first symptoms, according to the CDC.
While most people recover, some develop serious complications like pneumonia and brain swelling. Up to 5% of children with measles suffer pneumonia, the CDC says, and one to three out of every 1,000 children with measles dies.
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