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Four more cases of mumps in King County bring total to 58

BERLIN, GERMANY - FEBRUARY 26: A children's doctor injects a vaccine against measles, rubella, mumps and chicken pox to an infant on February 26, 2015 in Berlin, Germany. The city of Berlin is facing an outbreak of measles that in recent weeks has led to over 700 cases and one confirmed death of a little boy who had not been vaccinated. Vaccination in Germany is not compulsory by law though the vast majority of parents have their children vaccinated. (Photo by Sean Gallup/Getty Images)

SEATTLE – Four more cases of the mumps have been discovered in King County, bringing the total to 58.

King County Public Health said 11 cases are confirmed and 48 are probable, and that 38 of the patients are 17 or younger.

Four probable cases of the mumps are also being investigated in Pierce County.

The outbreak has grown steadily since three cases were confirmed at the end of November.

Mumps is at a 10-year high in the U.S., according to the Centers for Disease Control and Prevention. The latest tally as of November 5 is 2,879 cases in 45 states and the District of Columbia.

Mumps is a contagious disease caused by a virus spread through saliva and mucus. The CDC recommends that children get two doses of the MMR vaccine, which protects against measles, mumps, and rubella, but it is not 100% effective.