The Centers for Disease Control and Prevention said 387 measles cases have been confirmed from January 1 to March 28, including 73 cases last week alone.
Switzerland saw 55 new measles cases in March, according to new figures from the Federal Office of Public Health (FOPH).
These measures include: the identification of people who may have come into contact with someone infected with measles; the exclusion from kindergarten or school of children who have not been vaccinated; and the vaccination of people who have come into contact with someone infected with measles.
In Switzerland, two doses of the measles/mumps/rubella (MMR) vaccination are recommended for children: the first at nine months and the second at 12 months. There were 372 cases confirmed by this time in 2018.
There have been three measles-related deaths reported in the US since 2000, including two in 2003 and one in 2015.
Outbreaks - defined as three or more cases - are ongoing in California (Santa Cruz and Butte County), New Jersey, New York (Rockland County and New York City) and Washington, according to the CDC.
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The number was topped only once before, in 2014, when 667 cases were reported by the same date. The CDC says vaccinations are 97 percent effective and the agency urges vaccinations before traveling internationally. All three area outbreaks were linked to travelers bringing measles back from Israel and then spreading the virus among unvaccinated people in Orthodox Jewish communities.
In addition, people who have not been vaccinated against measles, or who have only had a single dose, should ensure they have been vaccinated fully.
The most common symptoms include fever, runny nose, cough, and a rash all over the body. A very small number of those infected and can develop pneumonia, swelling of the brain or other serious symptoms. Measles can also cause pregnant women to deliver prematurely.
Measles is highly contagious.
This year's numbers have been driven by outbreaks in several states, including New York, California, Illinois, Texas, and Washington.